CN115950519A - Sound velocity accurate measurement device, detection method and storage medium - Google Patents

Abstract

The invention is suitable for the field of sound velocity measurement, and provides a sound velocity accurate measurement device, a detection method and a storage medium, wherein the sound velocity accurate measurement device comprises: the device comprises a laser measuring device, a sound field generating device and a detecting device; the laser measuring device comprises a pulse laser, a plurality of spectroscopes, a plurality of reflectors and a photoelectric detector; the sound field generating device comprises a sound source and a medium container; the detection device comprises two position sensors, the position sensors are used for respectively receiving a first detection light beam and a second detection light beam, and whether the sound field generation device deviates from a set position is determined by determining the deflection conditions of the first detection light beam and the second detection light beam on the position sensors. By introducing the detection device, whether the relative position between the laser measurement device and the sound field generation device is accurate or not is confirmed by using the detection device, so that the relative position is adjusted, and the accuracy of sound velocity measurement is improved.

Description

Accurate sound velocity measurement device, detection method and storage medium

technical field

The invention belongs to the field of sound velocity measurement, and in particular relates to a sound velocity accurate measurement device, a detection method and a storage medium.

Background technique

The speed of sound in the ocean is a key position in ocean measurement. It not only directly determines the accuracy of positioning, but also affects the efficiency of radar and sonar. Therefore, achieving high-precision and fast ocean sound velocity measurements is crucial to advancing ocean exploration. At present, seawater sound velocity measurement is mainly used in sonar, which uses sound waves in water to detect underwater targets, and is widely used in important marine engineering applications such as torpedo guidance, ship navigation, hydrographic survey, and submarine imaging.

At present, the traditional sound velocity instrument is divided into two categories: temperature salt depth detector (CTD) and sound velocity profiler (SVP). Temperature Salinity Depth Detector (CTD) calculates the sound velocity value of seawater by measuring the values of temperature, salinity and depth, and using the empirical formula of seawater. The sound velocity profiler (SVP) uses the pulse ring sound method, through the combination of pulse sound wave and piezoelectric effect, and the measurement of the flight time of the sound wave, so as to complete the calculation of the sound velocity. The above two traditional sound velocity meters and temperature, salt and depth detectors are based on empirical formula methods, which are limited by application scenarios and application areas, and the accuracy fluctuates greatly, and it is difficult to guarantee traceability. The ringing method used by the sound velocity profiler uses the piezoelectric effect to introduce errors that are difficult to eliminate, and has strict requirements on the transducer. In order to obtain accurate sound velocity values, it is usually necessary for sound waves to go back and forth multiple times within a fixed distance , so the time error is accumulated in multiple round trips, and the echo may interfere with the transmitted signal, thus affecting the accuracy of sound velocity measurement. In marine metrology, the accuracy of the traceable direct method often needs to be calibrated by the non-traceable indirect method. Therefore, the traditional sound velocity measurement method cannot guarantee traceability and accuracy at the same time, and the establishment of benchmarks in the field of seawater measurement has not been completed. In the prior art, the Mach-Zehnder interferometer is used to measure the speed of sound in water, which emits laser light from a laser source and divides it into two beams through a spectroscope, one beam is the measurement beam, and the other is the reference beam, the measurement beam and the reference beam Parallel and passing through the sound field and having an acousto-optic effect with the sound wave, the two laser beams are recombined, and the sound velocity is measured according to the optical path difference and time difference between the measurement optical path and the reference optical path.

In the prior art, when measuring the speed of sound, the requirements for the relative positions of the various components are relatively high, which may cause deviations in the measurement of the speed of sound.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a device for accurately measuring the speed of sound, aiming at reducing the deviation generated when measuring the speed of sound in the prior art.

The embodiment of the present invention is achieved in this way, the sound speed accurate measurement device includes: a laser measurement device, a sound field generation device and a detection device;

The laser measurement device includes a pulsed laser, several spectroscopes, several reflectors and photodetectors, wherein the laser beam emitted by the pulsed laser is split into a measuring beam and a reference beam by the spectroscope, and passes through the sound field generated by the sound field generating device. The beam is combined by the beam splitter, and then received by the photodetector, and the reflector is used to change the path of the reference beam;

The sound field generating device includes a sound source and a medium container, the sound source is arranged in the medium container for generating sound waves, and the sound waves form a sound field in the medium container;

The detection device is used to emit laser light, and receive at least two laser beams after passing through the sound field in parallel, and determine the deflection of the two laser beams after being acted on by the sound wave. The optical path of the laser beam passing through the sound field to being received is equal.

Another object of the embodiments of the present invention is a detection method for an accurate sound velocity measurement device, the detection method comprising:

Obtain the offset data of the light spots formed by the two laser beams on the position sensor in the laser measuring device provided by the above-mentioned summary of the invention;

Confirming whether the offset distance and offset angle of the two laser beams are the same according to the offset data;

Judging whether the relative positional relationship between the measuring beam and the sound field generating device in the laser measuring device is accurate;

If it is inaccurate, control the adjusting device to adjust the position of the sound field generating device.

Another object of the embodiments of the present invention is a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the processor executes one of the above-mentioned The steps of the detection method of the sound velocity precise measurement device.

An accurate sound velocity measurement device provided in an embodiment of the present invention introduces a detection device and uses the detection device to confirm whether the relative position between the laser measurement device and the sound field generating device is accurate, so as to adjust the relative position, thereby improving the accuracy of sound velocity measurement. Accuracy.

Description of drawings

Fig. 1 is a schematic diagram of the principle of a sound velocity accurate measurement device provided by an embodiment of the present invention;

Fig. 2 is a sound velocity measurement schematic diagram of a sound velocity accurate measurement device provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of the principle of another accurate measurement device for sound velocity provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of the principle of another accurate sound velocity measurement device provided by an embodiment of the present invention.

In the accompanying drawings: 10, pulse laser; 11, first beam splitter; 12, second beam splitter; 13, third beam splitter; 14, first reflector; 15, second reflector; 16, fourth beam splitter ; 17, the fifth beam splitter; 18, photoelectric detector; 19, oscilloscope; 21, medium container; 22, sound source; 31, first position sensor; 32, second position sensor; 33, position determination device; 41, Translation platform; 42, the third mirror; 43, the fourth mirror; 44, the sixth beam splitter; 45, the seventh beam splitter; 46, the eighth beam splitter; 47, the fifth mirror; 48, the sixth reflection mirror; 49, continuous interference device.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The specific implementation of the present invention will be described in detail below in conjunction with specific embodiments.

As shown in Figure 1, it is a schematic diagram of the principle of a sound velocity accurate measurement device provided by an embodiment of the present invention, including:

Laser measuring device, sound field generating device and detection device;

The laser measurement device includes a pulsed laser 10, several beamsplitters, some reflectors and a photodetector 18, wherein the laser beam emitted by the pulsed laser 10 is split into a measurement beam and a reference beam by the beamsplitter, and passes through the sound field generating device to generate After the sound field of the beam is combined by the beam splitter, it is received by the photodetector 18, and the mirror is used to change the path of the reference beam;

The sound field generating device includes a sound source 22 and a medium container 21, the sound source 22 is arranged in the medium container 21 for generating sound waves, and the sound waves form a sound field in the medium container 21;

The detection device includes two position sensors, the position sensors are used to respectively receive the first detection beam and the second detection beam, the first detection beam is led out by a beam splitter after the measurement beam passes through the sound field, so The second detection beam is led out by another beam splitter after the reference beam passes through the sound field, and the occurrence of the sound field is determined by determining the deflection of the first detection beam and the second detection beam on the position sensor. Whether the device deviates from the set position.

In this embodiment, in this embodiment, the laser measuring device and the sound field generating device are coordinated, the measuring beam and the reference beam of the laser measuring device pass through the sound field generated by the sound field generating device, and the sound waves in the sound field are respectively on the measuring beam and the sound field generating device. The effect of the reference beam, the disturbance of the sound wave on the measurement beam and the reference beam is detected by the photodetector 18, and then the propagation time of the sound wave between the measurement beam and the reference beam can be accurately measured, and then the distance between the reference beam and the measurement beam passing through the sound field can be measured. The distance between them can be used to calculate the propagation speed of sound waves in the medium. The positional relationship between the laser measuring device and the sound field generating device cannot deviate from the set position during measurement, that is, the measuring beam and the reference beam are perpendicular to the direction of sound wave propagation, otherwise errors will occur in the measurement results. By setting the detection device, the detection device is used to detect the deflection of the measuring beam and the reference beam on the position sensor after the sound field; when the relative position of the sound field generating device and the laser measuring device changes, the transmission direction of the sound wave is different from that of the measuring beam. When it is vertical, for example, the sound field generating device is tilted. At this time, the optical path of the measuring beam and the reference beam from the medium container 21 to the received optical path will change compared with the optical path at the initial setting, so that the deflection of the light spot after the two laser beams are received Circumstances change. In this way, the detection device is used to confirm whether the relative position between the laser measuring device and the sound field generating device is accurate, so as to adjust the set position, thereby improving the accuracy of sound velocity measurement.

In this embodiment, the laser measuring device is used to cooperate with the sound field generating device to measure the speed of sound, mainly the sound speed of sound in different media. The pulsed laser 10 can be a femtosecond laser, and the frequency of the pulsed laser emission is constant; the beam part where the measuring beam and the reference beam pass through the sound field generating device is two parallel beams, and the distance between the two parallel beams can be preset , and can also be measured manually, which is not specifically limited here. The measuring light beam and the reference light beam will interact with the sound wave in the sound field to produce the acousto-optic diffraction effect. The beam part of the measuring beam and the reference beam passing through the sound field generating device is perpendicular to the transmission direction of the sound wave, and the positional relationship between the laser measuring device and the sound field generating device can be set according to this relationship. The measuring beam and the reference beam are sent out by a pulsed laser generator and then split by a beam splitter. The measuring beam and the reference beam pass through the sound field and are combined by another beam splitter, and are then received by a photodetector 18. The reference beam comes from the same laser beam and is parallel in the sound field. The path of the reference beam can be changed through the cooperation of the mirror.

In this embodiment, the medium container 21 in the sound field generating device is used to accommodate the medium to be measured, and the medium to be measured can be liquid or gas, such as water; the sound source 22 can emit plane waves, and the effect of the plane waves on the medium to be measured The effect is better, and the effect on the measurement beam and the reference beam is also better, which can reduce errors; the sound source 22 can be arranged on the side wall of one end inside the medium container 21, and the sound wave emitted by the sound source 22 can be transmitted by one end of the medium container 21 To the other end, the medium container 21 may be in the shape of a cuboid, which is not specifically limited here. However, in this embodiment, the frequency of the sound wave where the acousto-optic diffraction effect occurs may be a chirp signal of 1 MHz, which is not specifically limited here. When the sound wave passes through the reference beam and the measurement beam, it will diffract, and the photodetector 18 receives the laser light and generates a corresponding signal, which can be denoised, autocorrelated, and cubic spline interpolation processed, that is Acoustic time-of-flight is available.

In this embodiment, when the detection device is required to detect whether the sound field generating device deviates from the preset position, the sound field generating device can emit low-frequency sound waves, and the low-frequency sound waves act on the measurement beam and the reference beam. At this time, the laser light is mainly refracted, and the detection device Detection of refraction-induced deflection of the measuring and reference beams. The detection device may comprise two position sensors to detect the measuring beam, the reference beam. Specifically, the measuring beam and the reference beam can be extracted through a beam splitter, and then used as the first detection beam and the second detection beam, and the first detection beam and the second detection beam are used to reflect the refraction of the sound field to the measurement beam and the reference beam . Preferably, the measuring beam and the reference beam can be drawn out at the same position after they exit the sound field generating device, and the two position sensors can also receive the measuring beam and the reference beam at the same position; When the position of the device conforms to the set position, no matter whether the sound source 22 is turned on or not, the deflection angle and deflection distance of the light spots formed by the first detection beam and the second detection beam on the position sensor should be the same, as long as the position of the sound field generating device deviates from the set position. According to the geometric principle, the deflection position and deflection distance of the light spot formed by the first detection beam and the second detection beam on the position sensor will be different. It can be understood that the distances between the two position sensors and the sound field generating device may not necessarily be equal. For example, the distance between the two position sensors and the sound field generating device is a multiple relationship, then the first detection beam and the second detection beam are in the position sensor. The deflection of the spot formed on the position sensor also changes correspondingly according to the multiple relationship. When the position of the sound field generating device deviates from the set position, the deflection position and deflection distance of the spot formed by the first detection beam and the second detection beam on the position sensor will no longer match. Deflection under normal conditions.

It can be understood that usually the position of each component cannot be corrected when measuring the speed of sound, and it can be corrected by emitting laser light without turning on the sound source 22 when setting the position of each component in the laser measuring device and detection device .

As for the principle of the detection device, for example, when the sound wave propagates, if the propagation direction of the sound wave is perpendicular to the laser beam, due to the acousto-optic refraction effect, the light will only move on the X-axis of the received plane, not on the Y-axis There is a reading in the direction; if there is a reading in the Y direction at this time, the sound wave propagation direction is not perpendicular to the beam, indicating that there is a deflection in a certain direction in the sound field generating device; The deflection of the sound field generating device in other directions leads to further deflection of the laser on the X axis, which cannot be detected by one laser beam. At this time, two laser beams are used to detect the measuring beam and the reference beam. At this time, due to the deflection of the sound field generating device in other directions, the distance between the two laser beams and the received plane after being acted by the sound wave is no longer equal, so that the deflection of the two laser beams on the received plane If the distances are no longer equal, a deflection of the sound source 22 generating means in the other direction can be detected. In order to subsequently correct the position of the sound field generating device according to the detection result of the detection device.

For the laser measuring device, exemplary, in one embodiment, as shown in Fig. 2, the laser light emitted by the pulsed laser 10 in the laser measuring device is divided into a measuring beam and a reference beam by the first beam splitter 11, and when the measuring beam passes through After the sound field and the reference beam are reflected by the first reflector 14 and the second reflector 15 in turn, the measurement beam and the reference beam are combined by the second beam splitter 12 to form the first combined laser beam, that is, the first beam splitter Between the mirror 11 and the second beamsplitter 12 is the measurement beam, and between the first beamsplitter 11 to the first reflector 14 to the second reflector 15 to the second beamsplitter 12 is the reference beam; Half of the optical path difference of the beam is the flight distance of the sound wave propagation. In this embodiment, the beam-combined laser light can be directly received by a photodetector 18 , and the photodetector 18 can pass through a filter after receiving it, and then the waveform can be displayed by an oscilloscope 19 . The pulsed laser 10 emits the pulsed laser at a fixed frequency, so the emission period of the pulsed laser is determined. When a sound wave acts on the measuring beam and the reference beam respectively, the oscilloscope 19 will display two different waveforms, and the two waveforms The time difference between the two waveforms is the propagation time of the sound wave between the measurement beam and the reference beam, and the time difference between the two waveforms can be determined by the number of pulses.

As shown in Figure 1, as a preferred embodiment of the present invention, the laser light emitted by the pulsed laser 10 is divided into a measurement beam and a reference beam by the first beam splitter 11, and the measurement beam passes through the sound field and the reference beam in turn After being reflected by the first reflector 14 and the third beam splitter 13, the measurement beam and the reference beam are combined into the first combined laser beam through the second beam splitter 12; The second beam splitter 12 transmits and is received by the first position sensor 31. The second detection beam is transmitted by the reference beam through the third beam splitter 13 and is received by the second position sensor 32. The first beam splitter 11, The second beam splitter 12 and the first position sensor 31 are located on the same straight line, and the first reflection mirror 14 , the third beam splitter 13 and the second position sensor 32 are located on the same straight line.

In this embodiment, the second beam splitter 12 is not only used to combine the measurement beam and the reference beam, but also to transmit the measurement beam as the first detection beam; the third beam splitter 13 refracts the reference beam by 90° for subsequent Combined with the measurement beam, it is also used to transmit the reference beam as the second detection beam; thus the transmitted first detection beam and the second detection beam are naturally parallel to each other. At this time, the first position sensor 31 and the second detection beam The two position sensors 32 respectively receive the first detection beam and the second detection beam, equivalent to directly detecting both without changing the propagation direction of the detection beam and the reference beam, so as to better determine whether the sound field generating device deviates from the set position.

In a further embodiment, the distance between the second beam splitter 12 and the first position sensor 31 is equal to the distance between the third beam splitter 13 and the second position sensor 32 . At this time, when the sound source 22 is not turned on or the sound source 22 emits sound at a lower frequency, the deflection distance and deflection angle of the light spots on the first position sensor 31 and the second position sensor 32 are the same.

As shown in Figure 3, as a preferred embodiment of the present invention, the laser light emitted by the pulsed laser 10 is divided into a measurement beam and a reference beam by the first beam splitter 11, and the measurement beam passes through the sound field and the reference beam in turn After being reflected by the first reflector 14 and the second reflector 15, the measurement beam and the reference beam are combined into the first combined laser beam through the second beam splitter 12; The four beam splitters 16 reflect at 90° and are received by the first position sensor 31, and the second detection beam is reflected at 90° by the reference beam through the fifth beam splitter 17 and are received by the second position sensor 32; The distance between the first beamsplitter 11 and the fourth beamsplitter 16 is equal to the distance between the first reflector 14 and the fifth beamsplitter 17; the distance between the fourth beamsplitter 16 and the first position sensor 31 is the same as The distance between the five beam splitters 17 and the second position sensor 32 is equal.

In this embodiment, a fourth beam splitter 16 is set between the first beam splitter 11 and the second beam splitter 12, and a fifth beam splitter 17 is set between the first reflector 14 and the second reflector 15. The four beam splitters 16 reflect the measurement beam as the first detection beam, and the reference beam is reflected by the fifth beam splitter 17 as the second detection beam. At this time, the first position sensor 31 and the second position sensor 32 respectively receive the first detection beam and the second detection beam, which is equivalent to detecting the refracted detection beam and the reference beam, and then can also realize whether the sound field generating device deviates from the set position .

As a preferred embodiment of the present invention, the medium to be measured is contained in the medium container 21, the sound source 22 is an ultrasonic transducer, and the medium container 21 is as wide as the ultrasonic transducer, so that the ultrasonic The sound wave emitted by the transducer is an approximate plane wave: the extension direction of the medium container 21 is the same as the propagation direction of the sound wave. The ultrasonic transducer can generate sound waves with the same width. When the width of the medium container 21 is the same as the width of the ultrasonic transducer, the sound waves emitted by the ultrasonic transducer will hardly bounce on the inner wall of the medium container 21 to damage the ring. Waveform, thereby reducing the interference of the medium container 21.

As a preferred embodiment of the present invention, the detection device further includes a position determining device 33, the position determining device 33 is used to determine the deflection of the first detection beam on the first position sensor 31, and the second The deflection of the light beam on the second position sensor 32 is detected. The light spots of the first detection beam and the second detection beam detected by the position sensor are processed, and the light spots formed on the position sensor will be obtained by the position determination device 33, so as to adjust the sound source 22 or the medium container 21 of the sound field generating device. The positional relationship between the sound field and the two laser beams is more accurate, and the positional relationship between the sound field and the measuring beam and the reference beam is more accurate.

The position determination device 33 can be a microcomputer, which can include a processor, a memory, etc., which can execute programs to process the signals formed by the light spots on the first position sensor and the second position sensor, and can also issue control instructions, such as control and adjustment The device adjusts the position of the sound field generating device.

As shown in Figure 4, as a preferred embodiment of the present invention, the sound speed accurate measurement device also includes an adjustment device, the adjustment device is connected with the sound field generating device, and is used to adjust the sound speed according to the measurement result of the detection device. The relative positional relationship between the laser measuring device and the sound field generating device is adjusted. In this embodiment, one end of the medium container 21 can be fixed on the mobile platform, and the mobile platform can adjust the medium container 21 in six degrees of freedom, that is, adjust the spatial position of the medium container 21; The control can be realized according to the detection result of the detection device. For example, the control data can be actively output according to the detection result of the position determination device 33, and the adjustment device can be controlled to adjust the medium container 21; Feedback to determine whether it is adjusted to an appropriate position, and the adjustment device continues to adjust until the medium container 21 is adjusted to an appropriate position.

As shown in Figure 1, as a preferred embodiment of the present invention, the laser light emitted by the pulsed laser 10 is divided into a measurement beam and a reference beam by the first beam splitter 11, and the measurement beam passes through the sound field and the reference beam in turn After being reflected by the first reflector 14 and the second reflector 15 , the measurement beam and the reference beam are combined by the second beam splitter 12 to form a first combined laser beam. Described laser measuring device also comprises distance measuring device, and described distance measuring device comprises displacement platform 41, some spectroscopes and continuous interference device 49, and described displacement platform 41 one end is provided with the 3rd reflection mirror 42, and the other end is provided with the 4th mirror 42. Mirror 43, the sixth beam splitter 44 is arranged between the pulse laser 10 and the first beam splitter 11, the seventh beam splitter 45 is arranged between the sixth beam splitter 44 and the displacement stage 41, and the sixth beam splitter A beam of laser light emitted by the mirror 44 transmits the seventh beam splitter 45, and is refracted by the seventh beam splitter 45 after being reflected by the third reflector 42, and then combined, and the laser beam combined by the seventh beam splitter 45 is combined with the first beam again. A combined beam laser interference; when the laser light passes through the seventh beamsplitter 45 to the eighth beamsplitter 46 by the third reflector 42 and the laser passes through the first beamsplitter 11 through the second beamsplitter 12 to the sixth beamsplitter 44 The optical path of the eighth beam splitter 46 is equal, and the first interference occurs; when the laser light passes through the seventh beam splitter 45 to the eighth beam splitter 46 by the third reflection mirror 42 and the laser passes through the first beam splitter 44 by the sixth beam splitter The beam splitter 11 is equal to the optical path from the second mirror 15 through the second mirror 12 to the eighth beam splitter 46 through the first reflector 14, and the second interference occurs, and the continuous interference device 49 is used as a double interference reference base. The fifth reflector 47 can also be set between the third reflector 42 and the seventh beam splitter 45, the sixth reflector 48 can also be set between the eighth beam splitter 46 and the photodetector 18, the fifth reflector 47 and the first beam splitter The six reflectors 48 are used to change the direction of the optical path to rationally arrange the position of each component.

In this preferred embodiment, the distance measurement device measures the optical path difference between the reference beam and the measurement beam, and then equivalently calculates the flight distance of the sound wave propagating between the measurement beam and the reference beam in the sound field. The continuous interference device 49 may include an independent continuous laser emitter (CW3), reflector, beam splitter, photodetector 18 (PD2), etc. The continuous light emitted by the continuous interference device 49 can continuously interfere. The first interference and the second interference are essentially interference with the measuring beam and the reference beam, and two interference signals can be obtained. By locking the peaks of the two interference signals, the number of interference fringes of continuous light between the two peaks is calculated, so that Find the flight distance of the sound wave. For the flight time of the sound wave, it is determined by the signal generated by the sound wave acting on the reference beam and the measuring beam, so as to calculate the propagation speed of the sound wave in the medium.

In this embodiment, the detection method can be applied to a computer device, the computing device can be a position determination device, and the position determination device can be used to control the adjustment device. At this time, the sound speed accurate measurement device includes the position determination device and the adjustment device , the adjustment method can be to actively output control data according to the detection results of the position determination device, and control the adjustment device to adjust the medium container; it is also possible to first control the adjustment device for small fine-tuning, and then determine whether it is adjusted to a suitable position according to the feedback from the position determination device. The device continues to adjust until the medium container is adjusted to a proper position. By measuring the relative positional relationship between the light beam and the sound field in the detection laser measuring device, automatic adjustment is performed to improve the processing efficiency.

The embodiment of the present invention also provides a computer-readable storage medium. A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the processor is made to perform the following steps:

Obtain the offset data of the light spots formed by the two laser beams on the position sensor in the laser measuring device provided in any of the above embodiments;

Confirming whether the offset distance and offset angle of the two laser beams are the same according to the offset data;

Judging whether the relative positional relationship between the measuring beam and the sound field generating device in the laser measuring device is accurate;

If it is inaccurate, control the adjusting device to adjust the position of the sound field generating device.

The embodiment of the present invention also provides a computer device, which includes a processor, a memory, a network interface, an input device, and a display screen connected through a system bus. Wherein, the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the computer equipment stores an operating system and also stores a computer program. When the computer program is executed by the processor, the processor can realize the detection method of the sound velocity precision measuring device. A computer program may also be stored in the internal memory, and when the computer program is executed by the processor, the processor may execute the detection method of the sound velocity precision measuring device.

The embodiment of the present invention also provides an accurate measurement device for sound velocity, and based on the accurate measurement device for sound velocity, a detection method and a storage medium for the accurate measurement device for sound velocity are provided, and the sound velocity is measured through the cooperation between the laser measurement device and the sound field generating device , through the detection device to confirm whether the relative position between the laser measuring device and the sound field generating device is accurate, so as to adjust the relative position, thereby improving the accuracy of sound velocity measurement; through the adjusting device to automatically adjust the distance between the laser measuring device and the sound field generating device The relative position between them improves the processing efficiency; the optical path difference between the reference beam and the measuring beam is measured by the distance measuring device, so that the measurement of the flight distance of the sound wave is more accurate; the final sound wave is made in the medium to be measured by the above technical means The speed of propagation is measured more accurately.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be realized through computer programs to instruct related hardware, and the programs can be stored in a non-volatile computer-readable storage medium When the program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, any references to memory, storage, database or other media used in the various embodiments provided in the present application may include non-volatile and/or volatile memory. Nonvolatile memory can include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Chain Synchlink DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present invention. It should be pointed out that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. A sound speed accurate measurement device is characterized in that, the sound speed accurate measurement device comprises: a laser measuring device, a sound field generating device and a detection device; The laser measurement device includes a pulsed laser, several spectroscopes, several reflectors and photodetectors, wherein the laser beam emitted by the pulsed laser is split into a measuring beam and a reference beam by the spectroscope, and passes through the sound field generated by the sound field generating device. The beam is combined by the beam splitter, and then received by the photodetector, and the reflector is used to change the path of the reference beam; The sound field generating device includes a sound source and a medium container, the sound source is arranged in the medium container for generating sound waves, and the sound waves form a sound field in the medium container; The detection device includes two position sensors, the position sensors are used to respectively receive the first detection beam and the second detection beam, the first detection beam is led out by a beam splitter after the measurement beam passes through the sound field, so The second detection beam is led out by another beam splitter after the reference beam passes through the sound field, and the occurrence of the sound field is determined by determining the deflection of the first detection beam and the second detection beam on the position sensor. Whether the device deviates from the set position. 2. A kind of sound speed accurate measurement device according to claim 1, it is characterized in that, the laser light that described pulse laser sends is divided into measurement beam and reference beam through the first beam splitter, after described measurement beam passes through sound field and reference beam, After the light beam is reflected by the first mirror and the third beam splitter in turn, the measurement beam and the reference beam are combined into the first combined beam through the second beam splitter; the first detection beam is formed by the measurement beam through the second The beam splitter is transmitted and received by the first position sensor, the second detection beam is transmitted by the reference beam through the third beam splitter and received by the second position sensor, the first beam splitter, the second beam splitter, the first beam splitter A position sensor is located on the same straight line, and the first reflecting mirror, the third beam splitter, and the second position sensor are located on the same straight line. 3. A kind of sound speed accurate measurement device according to claim 1, it is characterized in that, the laser light that described pulse laser sends is divided into measurement beam and reference beam through the first beam splitter, after described measurement beam passes through sound field and reference beam, After the light beam is reflected by the first reflector and the second reflector in turn, the measurement beam and the reference beam are combined into the first combined beam through the second beam splitter; The beam splitter is reflected at 90° and received by the first position sensor, and the second detection beam is reflected at 90° by the reference beam through the fifth beam splitter and received by the second position sensor; the first beam splitter 1. The distance between the fourth beam splitter is equal to the distance between the first reflector and the fifth beam splitter; the distance between the fourth beam splitter and the first position sensor is the same as the distance between the fifth beam splitter and the second position sensor equal. 4. A kind of sound velocity accurate measuring device according to claim 1, it is characterized in that, the medium to be measured is contained in the described medium container, and the sound source is an ultrasonic transducer, and the medium container and the ultrasonic transducer The energy device has the same width, and the extension direction of the medium container is the same as the propagation direction of the sound wave. 5. A kind of sound velocity accurate measurement device according to claim 2, is characterized in that, the distance between the second beam splitter, the first position sensor and the distance between the third beam splitter, the second position sensor equal distance. 6. The device for accurately measuring sound velocity according to claim 2 or 3, wherein the detection device further comprises a position determining device, and the position determining device is used to determine that the first detection beam is at the first position The deflection situation on the sensor, and the deflection situation of the second detection beam on the second position sensor. 7. A kind of sound velocity accurate measurement device according to claim 2 or 3, it is characterized in that, described sound velocity accurate measurement device also comprises adjustment device, and described adjustment device is connected with described sound field generating device, is used for according to described The measurement result of the detecting device adjusts the relative positional relationship between the laser measuring device and the sound field generating device. 8. A kind of sound velocity accurate measuring device according to claim 2 or 3, it is characterized in that, described laser measuring device also comprises distance measuring device, and described distance measuring device comprises displacement table, some spectroscopes and continuous interference device, One end of the displacement stage is provided with a third reflector, the other end is provided with a fourth reflector, a sixth beamsplitter is provided between the pulse laser and the first beamsplitter, and a sixth beamsplitter is provided between the sixth beamsplitter and the displacement stage. There is a seventh beam splitter, a beam of laser light emitted by the sixth beam splitter is transmitted through the seventh beam splitter, and is reflected by the third reflector back to the seventh beam splitter and reflected, and then passes through the eighth beam splitter and the The first combined laser beam interference; when the optical path of the laser from the third mirror through the seventh beam splitter to the eighth beam splitter is the same as that of the laser from the sixth beam splitter through the first beam splitter through the second beam splitter to the eighth beam splitter The optical path is equal, the first interference occurs; when the optical path of the laser from the third mirror through the seventh beam splitter to the eighth beam splitter is the same as that of the laser from the sixth beam splitter through the first beam splitter through the first mirror through the first mirror The optical paths from the second reflector to the eighth beam splitter are equal, and the second interference occurs, and the continuous interference device is used as a reference for the two interferences. 9. A detection method for an accurate sound velocity measurement device, characterized in that the detection method comprises: Obtaining the offset data of the spot formed by the first detection beam and the second detection beam on the position sensor according to any one of claims 1-8; confirming whether the offset distance and offset angle of the first detection beam and the second detection beam are the same according to the offset data; Judging whether the relative positional relationship between the measuring beam, the reference beam and the sound field generating device in the laser measuring device is accurate; If it is inaccurate, control the adjusting device to adjust the position of the sound field generating device. 10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the processor executes the one described in claim 9. The invention discloses the steps of a detection method for a sound velocity precision measuring device.

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