CN221649724U - Laser optical power detection module and detection system - Google Patents

Abstract

The utility model discloses a laser light power detection module and a detection system, comprising an energy attenuation cavity, a reflecting plate and a plurality of photoelectric detectors. The energy attenuation cavity is provided with a laser input port and a laser output port which are arranged oppositely, the energy attenuation cavity is used for attenuating laser passing through the laser input port into low-energy beam signals, the reflecting plate is arranged at the laser output port and used for receiving and diffusely reflecting the laser attenuated by the energy attenuation cavity and enabling the laser to attenuate again to form a plurality of low-energy beam signals, and the plurality of photodetectors are arranged at the end face of the laser input port at intervals and used for receiving the low-energy beam signals reflected back to the energy attenuation cavity by the reflecting plate and converting the low-energy beam signals into electric signals to be output. The laser optical power detection module provided by the utility model has the advantages of simple structure, convenience in maintenance, suitability for detecting high-power laser and lower manufacturing cost and maintenance cost.

Description

Laser optical power detection module and detection system

Technical Field

The utility model belongs to the field of laser power testing, and specifically relates to a laser optical power detection module and a detection system.

Background Art

In recent years, with the development of laser technology, the output power level of lasers has been continuously improved. In the process of research and development and use of related high-power fiber lasers and related equipment, it is necessary to accurately measure the power of the laser. From the principle of power testing, one is photoelectric, that is, using semiconductor materials to absorb photons to form a current signal, and the representative device is a photodetector; the other is thermoelectric, that is, light is irradiated on the absorber, and the light energy is converted into heat energy. The temperature of the absorber rises, and then a voltage signal is generated. This signal is proportional to the laser power, and the representative device is a thermopile. Among them, the photodetector has a higher response speed and sensitivity than the thermopile, but because the damage threshold of the photodetector is low, its range is relatively small.

At present, in the production process of high-power industrial lasers, the power meters used can basically only rely on imported equipment, which is expensive, has high maintenance costs and long repair cycles. The high cost of laser power meters that can measure high power also indirectly leads to high manufacturing costs for high-power lasers, and their prices have remained high for a long time.

Based on this, in order to solve the problem that most of the high-power laser power meters used in the prior art rely on imports, are expensive, have high maintenance costs, and have long repair cycles, it is necessary to design a new laser optical power detection module and detection system.

Utility Model Content

The purpose of this application is to address the deficiencies in the prior art and provide a laser optical power detection module and detection system, aiming to solve the problem that most high-power laser power meters in the prior art rely on imports, are expensive, have high maintenance costs, and have long repair cycles.

To achieve the above purpose, the technical solution adopted in this application is:

A laser optical power detection module comprises an energy attenuation cavity, a reflection plate and a plurality of photoelectric detectors. The energy attenuation cavity has a laser input port and a laser output port which are arranged relatively to each other. The energy attenuation cavity is used to attenuate the laser passing through the laser input port into a low-energy beam signal. The reflection plate is installed at the laser output port to receive and diffusely reflect the laser transmitted after passing through the energy attenuation cavity, and attenuate it again to form a plurality of low-energy beam signals. The plurality of photoelectric detectors are arranged at intervals on the end face where the laser input port is located, and are used to receive the low-energy beam signal reflected from the reflection plate back to the energy attenuation cavity, and convert it into an electrical signal for output.

As a preferred solution, the energy attenuation cavity is cylindrical, and the inner wall is provided with a black anodized film.

As a preferred solution, the reflector is made of graphite, aluminum, copper or copper-aluminum alloy.

As a preferred solution, the end surface of the reflection plate facing the energy attenuation cavity has a diffuse reflection layer.

As a preferred solution, the detection module also includes a detector fixing seat with multiple mounting holes, the detector fixing seat is connected to one end of the energy attenuation cavity having a laser input port, and each photoelectric detector is installed one-to-one in each mounting hole of the detector fixing seat.

As a preferred solution, the detector fixing seat also has a signal output port for outputting the electrical signal.

As a preferred solution, the detection module includes a heat sink installed on the side wall of the reflective plate for dissipating heat from the reflective plate; the detection module includes multiple cooling water channels, which are arranged on the outside of the energy attenuation cavity for dissipating heat from the energy attenuation cavity.

As a preferred solution, the detection module also includes a fixed base plate, the energy attenuation cavity and the reflector are both arranged on the fixed base plate, the fixed base plate also has an extension portion for fixing the laser output head, and the detector fixing seat is provided with a laser inlet aligned with the output end of the laser output head.

The present application also proposes a detection system, comprising a detection module described in any one of the above schemes, the detection system also comprising a processor, each photodetector is electrically connected to the processor, and the processor is used to receive the electrical signal output from the signal output port and process it.

Compared with the prior art, the beneficial effects of the present application are as follows: the laser optical power detection module provided by the embodiment of the utility model includes an energy attenuation cavity, a reflector and a plurality of photodetectors. Before power detection, the module needs to be calibrated and benchmarked to obtain the calibration coefficient of photoelectric conversion. After the high-power laser is input from the laser input port of the energy attenuation cavity, it is partially absorbed by the black anodized film in the cavity, and the remaining small amount of low-energy laser that is not absorbed reaches the reflector plate set at the laser output port, and is diffusely reflected into a plurality of low-energy beam signals, and the plurality of low-energy beam signals are reflected back to the energy attenuation cavity, and after secondary attenuation, they are absorbed by a plurality of photodetectors and the average value of each photodetector sampling is obtained, and then the power of the high-power laser to be measured is calculated based on the calibration coefficient. The present application realizes the attenuation and decomposition of high-power lasers by setting a reflector plate with a diffuse reflection layer at the laser output port of the energy attenuation cavity, and has a simple structure, and the cost is greatly reduced compared with the imported high-power optical power meter in the prior art.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

FIG1 is a three-dimensional schematic diagram of a laser optical power detection module in an embodiment of the utility model;

FIG2 is an exploded view of a laser optical power detection module in an embodiment of the present utility model;

FIG3 is an axial cross-sectional view of a laser optical power detection module in an embodiment of the present utility model.

Description of the drawings: 1. Reflection plate; 2. Energy attenuation cavity; 21. Cooling water channel; 3. Detector fixing seat; 31. Photoelectric detector; 32. Signal output port; 33 Positioning plate; 4. Baffle; 5. Fixed bottom plate; 51. Extension part; 6. Laser inlet.

DETAILED DESCRIPTION

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

Definition: The up-down and left-right orientation relationships between the various components are defined by the state of the detection module in this application in FIG1 .

As shown in Figures 1 and 2, the utility model provides a laser optical power detection module, including an energy attenuation cavity 2, a reflection plate 1 and a plurality of photodetectors 31. The energy attenuation cavity 2 has a laser input port (not shown in the figure) and a laser output port (not shown in the figure) arranged relatively to each other, and is used to attenuate the laser passing through the laser input port into a low-energy beam signal; the reflection plate 1 is installed at the laser output port to receive and diffusely reflect the attenuated laser after passing through the energy attenuation cavity 2, and form a plurality of beam signals; the plurality of photodetectors 31 are arranged at intervals on the end face where the laser input port is located, so as to receive a plurality of attenuated low-energy beam signals and convert them into electrical signals for output.

It is understandable that before the module is used for actual power detection, it needs to be calibrated to obtain the calibration coefficient of the photoelectric conversion.

The novel laser optical power detection module proposed in the present application realizes the attenuation and decomposition of the high-power laser to be measured by arranging a reflection plate with a diffuse reflection layer at the laser output port of the energy attenuation cavity. The module has a simple structure and is easy to maintain. It is suitable for detecting high-power lasers, and the manufacturing and maintenance costs are also lower.

Specifically, the energy attenuation cavity 2 of the detection module of this embodiment is cylindrical, and its inner wall is covered with a black anodized film to absorb laser light. When the laser is incident into the cavity, the deeper the incident distance of the light is in the cavity, the stronger the attenuation of the light is.

It is understandable that the cavity of the energy attenuation cavity 2 can be configured to be composed of multiple sections. Therefore, when a higher power laser needs to be detected, the length of the cavity can be appropriately lengthened to increase the attenuation of the light beam.

In one embodiment, the reflective plate 1 is made of graphite, aluminum, copper or copper-aluminum alloy, and its end surface facing the energy attenuation cavity 2 can be sandblasted to form a diffuse reflection layer, or a diffuse reflection coating with high reflectivity, such as aluminum oxide, zirconium oxide, or titanium oxide, can be directly coated on the end surface.

Please continue to refer to Figure 2. The detection module of the present application also includes a corresponding detector fixing seat 3 and a baffle 4. The detector fixing seat 3 and the baffle 4 both have multiple mounting holes (not shown in the figure) for fixing each other through bolts and other fixings, while preventing external smoke and dust from entering the detector fixing seat 3 and then entering the energy attenuation cavity 2, affecting the beam attenuation effect or the accuracy of sampling. The detector fixing seat 3 and the end of the energy attenuation cavity 2 with a laser input port are connected by bolts and other fixings, and each photodetector 31 is installed in each mounting hole of the detector fixing seat 3 in a one-to-one correspondence, and is fixed one by one by a positioning plate 33. The multiple light beam signals diffusely reflected from the reflection plate 1 are hit on each photodetector 31 after secondary attenuation in the energy attenuation cavity 2. Each photodetector 31 converts the collected light signal into an electrical signal, and then infers the power of the incident high-power laser to be measured based on the calibration coefficient.

1 , the detector fixing seat 3, energy attenuation cavity 2, reflector 1 and baffle 4 of the detection module of the present application are connected in sequence, and can cooperate with the laser output head to form a sealed space to prevent laser leakage from causing damage to surrounding personnel.

It can be understood that the detector fixing base 3 also has a signal output port 32 for outputting the electrical signal generated by the photodetector 31 .

The embodiment of the present application also proposes a detection system, including the detection module in the above scheme. It is understandable that the detection system includes a processor (not shown in the figure), the processor is electrically connected to each photodetector 31, and the electrical signal generated by the photodetector 31 is received and processed by the processor through the signal output port 32.

Specifically, after receiving the electrical signal of the power value output by the photodetector, the processor amplifies the measured power value of each photodetector in combination with the calibration coefficient pre-stored in the internal proportional operator, thereby obtaining the actual power of the high-power laser to be measured.

In some embodiments, the processor includes an arithmetic unit and a processor. The arithmetic unit is used to process data, such as logical operations such as AND, OR, and negation, as well as comparing values. A single-chip microcomputer can be directly selected, and the microcontroller unit MCU completes the data analysis and processing.

The calibration coefficients stored in the proportional operator are obtained by calibrating the standard beam. That is, the standard laser is used to emit light at multiple power values, and each input power corresponds to the output photocurrent of a group of photodetectors. Then, the corresponding algorithm is selected according to actual needs to obtain the fitting equations of multiple groups of calibration coefficients, and each input power corresponds to the output current of a group of photodetectors. Finally, the processor can obtain the photocurrent corresponding to the output conditions of the laser's standard beam under several optical power values, and obtain the parameter value of the calibration coefficient.

It should be noted that the standard beam and the high-power laser to be tested are different lasers. The standard beam refers to the laser used to obtain the fitting equation of the calibration coefficient during the calibration operation, and the high-power laser to be tested refers to the laser whose optical power needs to be detected in the actual process.

In some embodiments, the selected processor uses an 8-channel AD7686 chip and a 32-bit microcontroller for parallel sampling, and the number of photodetectors 31 is selected to be 8. In other embodiments, other types of processors can be selected, and the number of photodetectors 31 can also be other.

Furthermore, during the power detection process of the embodiment of the present application, the reflector 1 and the energy attenuation cavity 2 both need to be cooled and dissipated in a timely manner. Therefore, the detection module also includes a heat sink (not shown in the figure), which is specifically installed on the side wall of the reflector 1 to dissipate heat from the reflector 1.

Please refer to FIG3, which is an axial cross-sectional view of the detection module. The detection module also includes a plurality of cooling water channels 21, which are arranged in a straight-through manner on the outside of the energy attenuation cavity 2, and cooling water or other coolant flows inside to accelerate the cooling of the energy attenuation cavity 2 and improve the heat dissipation effect. The cooling water channel 21 can also be arranged in a spiral shape around the outside of the energy attenuation cavity 2 to increase the cooling area and further improve the heat dissipation effect.

Please continue to refer to Figures 1 and 2. The detection module of the present application also includes a fixed base plate 5. The energy attenuation cavity 2 and the reflector 1 are both arranged on the fixed base plate 5. The fixed base plate 5 has an extension portion 51 for fixing a laser output head (not shown in the figure), and the detector fixing seat 3 is provided with a laser inlet 6 aligned with the output end of the laser output head. The laser input port is connected to the laser inlet 6 to facilitate the input of the laser.

In order to facilitate the stable assembly of the energy attenuation chamber 2 on the fixed bottom plate 5, the energy attenuation chamber 2 is located in a cubic shell, and a plurality of cooling water channels 21 are located in the interlayer space formed by the cubic shell and the outer wall of the cylindrical energy attenuation chamber 2.

It can be seen from the above embodiments that the present application realizes the attenuation and decomposition of the high-power laser to be measured by arranging a reflection plate with a diffuse reflection layer at the laser output port of the energy attenuation cavity, converting the high-power laser into multiple low-energy light beams, and then inferring the power value of the high-power laser to be measured by measuring the optical power value of the low-energy light beam. Compared with the prior art, the structure of the present application is simpler and easier to maintain, so it is suitable for detecting high-power lasers, and the production cost and maintenance cost are also lower.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. The laser optical power detection module is characterized by comprising an energy attenuation cavity (2), a reflecting plate (1) and a plurality of photoelectric detectors (31), wherein the energy attenuation cavity (2) is provided with a laser input port and a laser output port which are arranged oppositely, and the energy attenuation cavity (2) is used for attenuating laser passing through the laser input port into a low-energy beam signal; the reflecting plate (1) is arranged at the laser output port and is used for receiving the laser transmitted through the energy attenuation cavity (2) and attenuating the laser again to form a plurality of low-energy beam signals; the plurality of photodetectors (31) are arranged at intervals on the end face of the laser input port, and are used for receiving the low-energy beam signals reflected back to the energy attenuation cavity (2) from the reflecting plate (1) and converting the low-energy beam signals into electric signals to be output.

2. The detection module according to claim 1, characterized in that the energy attenuation chamber (2) is cylindrical, the inner wall being provided with a black anodic oxide film.

3. The detection module according to claim 1, wherein the reflective plate (1) is made of graphite, aluminum, copper or copper-aluminum alloy.

4. The detection module according to claim 1, characterized in that the end face of the reflecting plate (1) facing the energy attenuation chamber (2) has a diffuse reflecting layer.

5. The detection module according to claim 1, further comprising a detector holder (3) having a plurality of mounting holes, wherein the detector holder (3) is connected to an end of the energy attenuation chamber (2) having a laser input port, and each of the photodetectors (31) is mounted in each of the mounting holes of the detector holder (3) in a one-to-one correspondence.

6. The detection module according to claim 5, wherein the detector holder further has a signal output port (32) for outputting the electrical signal.

7. The detection module according to claim 1, characterized in that it comprises a heat sink mounted to the side wall of the reflector plate (1) for dissipating heat from the reflector plate (1).

8. The detection module according to claim 1, characterized in that the detection module comprises a plurality of cooling water channels (21), a plurality of the cooling water channels (21) being arranged outside the energy attenuation chamber (2) for dissipating heat from the energy attenuation chamber (2).

9. The detection module according to claim 5, further comprising a fixing base plate (5), wherein the energy attenuation cavity (2) and the reflecting plate (1) are both arranged on the fixing base plate (5), the fixing base plate (5) further comprises an extension part (51) for fixing a laser output head, and the detector fixing base (3) is provided with a laser inlet (6) aligned with an output end of the laser output head.

10. A detection system comprising a detection module according to any one of claims 1-9, characterized in that the detection system further comprises a processor, each of the photodetectors (31) being electrically connected to the processor.