CN214623057U

CN214623057U - Light-released weak signal identification and amplification device

Info

Publication number: CN214623057U
Application number: CN202022178370.8U
Authority: CN
Inventors: 孙雪峰; 陆莹; 弋双文
Original assignee: Luminescence Dating Technology Jiangsu Co ltd
Current assignee: Luminescence Dating Technology Jiangsu Co ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-11-05
Anticipated expiration: 2030-09-29

Abstract

The utility model relates to a light-release weak signal identification and amplification device. Including photomultiplier and the filter plate of setting at the photomultiplier front end and the terminal input signal of the computer that links to each other with photomultiplier the photomultiplier in be provided with weak signal recognition system and lock-in amplification device between the terminal input signal of computer, just the other excitation light source that still is provided with of photomultiplier, the lock-in amplification device other end is connected with the laser instrument, weak signal recognition system includes AD converter, computer PC end and gate, lock-in amplification device includes amplifier, band pass filter, phase sensitive detector and low pass filter. The utility model discloses an useful part: the phase-locked amplifier can further amplify to obtain a signal with higher intensity, so that the detection and description of a weak signal in the luminescence measurement year become possible, no signal loss exists, the signal intensity can be flexibly recognized, intelligent control is realized, and the operation efficiency is improved.

Description

Light-released weak signal identification and amplification device

Technical Field

The utility model relates to a weak signal discernment and luminescence year-deciding technical field especially relate to a light luminescence weak signal discernment and amplification device.

Background

The photoemission annuometry technique is a quaternary method of directly measuring the time of occurrence of the last exposure event of a deposit using minerals (typically quartz and feldspar) in the deposit. The age of the deposit burial is finally obtained by comparing the total energy (ancient dose, or equivalent dose De) accumulated in the deposit burial with the annual radiation (annual dose) accumulated.

The total radiant quantity is calculated and calculated in a laboratory by adopting a dosimetry method, taking a monolithic regeneration method for testing De as an example, firstly, the energy of minerals is excited under illumination, and light waves with specific frequency are mainly collected, and the energy stored in the minerals is exponentially weakened along with time, and is shown on a curve that the intensity of an output luminescence signal is reduced along with the time; then a small experimental dose is given to obtain the intensity of the luminescence signal under artificial irradiation, and the De can be obtained by comparing the natural signal with the artificial signal. Therefore, detection and experimental performance of luminescence signals are crucial to obtaining reliable ages. However, the problem of weak signal in the luminescence measurement year is common, and particularly when quartz is used as a test mineral, a quartz luminescence signal is weak; secondly, light release signals in deposition areas such as northwest deserts in China are weak; the photomultiplier used in the existing luminescence signal collection detection has insufficient capability in noise reduction and weak luminescence signal amplification.

The key components in the test of the luminescence signal are a photomultiplier tube and a preposed filter plate, wherein the photomultiplier tube is used for amplifying the luminescence signal, and the preposed filter plate is used for acquiring light of a specific waveband. However, if the weak optical signal is further amplified, the current device needs to be modified. The lock-in amplifier has strong capability in detecting weak signals and reducing noise and can lock single frequency signals, so that a weak signal identification and lock-in amplification device is added between the photomultiplier and the input signal at the tail end of a computer, and the functions of screening weak signals and further amplifying the signals are achieved.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a light-release weak signal identification and amplification device to overcome the above-mentioned not enough that prior art exists at present.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a weak signal identification of light release and amplification device, includes photomultiplier and sets up the filter at photomultiplier front end and the terminal input signal of computer that links to each other with photomultiplier, its characterized in that: photomultiplier in be provided with weak signal identification system and lock phase amplification device between the terminal input signal of computer, just the other excitation light source that still is provided with of photomultiplier, the lock phase amplification device other end is connected with the laser instrument, weak signal identification system includes AD converter, computer PC end and gate, photomultiplier with computer PC end links to each other, just the AD converter still set up in photomultiplier with between the computer PC end, the gate respectively with photomultiplier, lock phase amplifier device and computer PC end link to each other, lock phase amplification device includes amplifier, band pass filter, phase sensitive detector and low pass filter, amplifier, band pass filter, phase sensitive detector and low pass filter switch on in proper order.

Preferably, the A/D converter, the PC end of the computer and the gate are combined to form a feedback loop, and the feedback loop judges the strength of the signal through a logic program.

Preferably, the phase sensitive detector is connected to the laser, the laser is capable of emitting a reference signal having a specific frequency and inputting the reference signal, and the low pass filter is connected to the PC terminal of the computer.

Preferably, the A/D converter is used for sampling signals sent by the photomultiplier, converting analog signals into digital signals and entering the digital signals into a computer PC (personal computer) for processing, sending an instruction to the gate from the computer PC after the operation is finished, and if the signal intensity reaches a preset value, the gate switch dials to the tail end of the computer to input signals and directly output the signals; if the signal intensity does not reach the preset value, the switch is shifted to the phase-locked amplifier to further reduce noise and amplify the signal.

The utility model has the advantages that:

1. the utility model discloses be different from only with the signal of mere amplification of photomultiplier, weak signal can obtain the bigger signal of intensity after further enlargiing through lock-in amplifier for the weak signal's in the luminescence measurement year detection and description become possible, and do not have the loss to the signal. Meanwhile, not all signals need to enter a phase-locked amplifier for further processing, and a control gate and an AD converter are added at the front end of the photomultiplier, a PC (personal computer) end and a phase-locked amplified node, so that the signal intensity can be flexibly recognized, intelligent control is realized, and the operating efficiency is improved;

2. a weak signal identification and phase-locked amplification device is added between a photomultiplier and an input signal at the tail end of a computer, so that the weak signal is screened and further amplified, a signal identification system comprises an A/D converter, a computer end and a gate to form a feedback loop, the signal strength is judged by a logic program, a light release signal is sampled by the A/D converter after being processed by the photomultiplier, a digital signal enters the computer for operation and can be output in the computer only when the signal strength reaches a set signal strength (expressed as signal amplitude in the program and in a unit of muV), and if the signal strength is below a set threshold value, the signal strength enters a phase-locked amplifier for next processing.

Drawings

Fig. 1 is a schematic structural view of a light-released weak signal recognition and amplification device of the present invention;

fig. 2 is a schematic diagram of an algorithm flow and a feedback loop of a weak signal recognition system of a light-released weak signal recognition and amplification device of the present invention;

fig. 3 is a schematic structural view of a lock-in amplifier of the light-released weak signal recognition and amplification device of the present invention;

in the figure: 1. a photomultiplier tube; 6. a filter plate; 2. a weak signal identification system; 21. an A/D converter; 22. a PC terminal of the computer; 23. a gate; 3. a phase-locked amplifying device; 31. an amplifier; 32. a band-pass filter; 33. a phase sensitive detector; 34. a low-pass filter; 4. an excitation light source; 5. a laser; 6. a filter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1, the embodiment is a light-released weak signal identification and amplification device, including a photomultiplier tube 1, a filter 6 disposed at the front end of the photomultiplier tube 1, and a computer end input signal connected to the photomultiplier tube 1, a weak signal identification system 2 and a lock-in amplification device 3 are disposed between the photomultiplier tube 1 and the computer end input signal, an excitation light source 4 is disposed beside the photomultiplier tube 1, a laser 5 is connected to the other end of the lock-in amplification device 3, the weak signal identification system 2 includes an a/D converter 21, a computer PC end 22 and a gate 23, the photomultiplier tube 1 is connected to the computer PC end 22, the a/D converter 21 is further disposed between the photomultiplier tube 1 and the computer PC end 22, the gate 23 is respectively connected to the photomultiplier tube 1, The phase-locked amplifying device 3 is connected with the PC end 22, the phase-locked amplifying device 3 comprises an amplifier 31, a band-pass filter 32, a phase sensitive detector 33 and a low-pass filter 34, and the amplifier 31, the band-pass filter 32, the phase sensitive detector 33 and the low-pass filter 34 are sequentially connected.

The A/D converter 21 is used for sampling the signal sent by the photomultiplier 1, converting the analog signal into a digital signal, entering a computer program for processing, sending an instruction to the gate 23 by the computer after the operation is finished, and if the signal intensity reaches a preset value, switching the gate 23 to a computer connecting end to directly output the signal; if the signal intensity does not reach the preset value, the switch is shifted to the phase-locked amplifying device 3, and the noise is further reduced and the signal is amplified. One end of the phase-locked amplifier is connected with the photomultiplier 1, the other end of the phase-locked amplifier is connected with the laser 5, and the phase-locked amplifier can emit a reference signal with specific frequency and input the reference signal. The measured signal is input into a phase-locked amplifying device 3 through a photomultiplier, the reference signal and the measured signal are used for autocorrelation operation, and the signal quantity under the reference frequency is automatically extracted for amplification;

the A/D converter 21, the PC end 22 and the gate 23 are combined to form a feedback loop, and the feedback loop judges the strength of the signal through a logic program.

The phase sensitive detector 33 is connected to the laser 5, the laser 5 can emit a reference signal with a specific frequency and input the reference signal, and the low pass filter 34 is connected to the PC terminal 22.

The A/D converter 21 is used for sampling the signal sent by the photomultiplier 1, converting the analog signal into a digital signal, entering the computer PC end 22 for processing, sending an instruction to the gate 23 by the computer PC end 22 after the operation is finished, and if the signal intensity reaches a preset value, the gate 23 switches to input a signal to the tail end of the computer and directly outputs the signal; if the signal intensity does not reach the preset value, the switch is shifted to the phase-locked amplifying device 3 to further reduce noise and amplify the signal.

When the implementation case is implemented, an AD converter 21 and a gate 23 are added between the photomultiplier 1 acquired by the original light-release signal and the PC end of the computer; the gate 23 is used as a node to connect the phase-locking amplifying device 3 and the PC end of the computer and control the flow direction of the signal; the AD converter 21 is connected with a computer to extract an analog signal, the analog signal is converted into a digital signal to enter a set program for logic operation, and the control end of the computer is connected with a gate 23 to send an instruction according to an algorithm result, so that a feedback loop is formed, a weak signal is automatically identified, and if the signal intensity is enough, the weak signal is directly output in the computer;

FIG. 2 shows a logic algorithm for weak signal identification, the core of the program is the setting of an intensity threshold value for allowing a signal to pass, the signal input is firstly sampled by an AD converter 21 and converted into a digital signal, the digital signal is converted into a measurable signal amplitude by counting, and when the set amplitude is larger than x μ V, the signal is input into a computer and a decline curve is automatically generated; otherwise, entering an amplifier for further processing;

fig. 3 is a configuration and a working process of the phase-locked amplifying device 3, which mainly includes a signal channel and a reference channel, a signal of the reference channel is from an external excitation light source 4, a detected signal is from a weak signal amplified by the photomultiplier tube 1, the reference signal is consistent with an optical signal with a required specific frequency, generally, a light wave required in a quartz test is blue light, that is, the light wave is adjusted to a blue light frequency, the signals entering the signal channel comprise noise signals and required signals, the signals are attenuated, added and amplified and then output in the band-pass filter 32, the reference signals and the detected signals enter the phase-sensitive detector 33 to perform cross-correlation operation of the reference signals and the detected signals, the detected signals with the same frequency and phase as the reference signals are extracted, finally, the required signal frequency is further extracted by the low-pass filter 34 and output at the computer end, and the signal amplification process is completed; in specific implementation, different thresholds can be set according to signal intensity for trying due to different regional differences of the luminescence samples and different burying processes.

The beneficial effects of the utility model reside in that, be different from only enlargeing the signal with photomultiplier is simple, weak signal can obtain the bigger signal of intensity after further enlargiing through phase-locked amplification device 3 for the weak signal's of luminescence is surveyed in the year and is described and become possible, and does not have the loss to the signal. Meanwhile, not all signals need to enter a phase-locked amplifier for further processing, and a gate 23 and an AD converter 21 are added at the front end of the photomultiplier, a computer end and a node of phase-locked amplification, so that the signal intensity can be flexibly recognized, intelligent control is realized, and the operation efficiency is improved.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a weak signal identification of light release and amplification device, includes photomultiplier (1) and sets up filter (6) and the terminal input signal of computer that links to each other with photomultiplier (1) in photomultiplier (1) front end, its characterized in that: the photoelectric tube is characterized in that a weak signal identification system (2) and a phase-locked amplification device (3) are arranged between the photoelectric tube (1) and a terminal input signal of a computer, an excitation light source (4) is arranged beside the photoelectric tube (1), the other end of the phase-locked amplification device (3) is connected with a laser (5), the weak signal identification system (2) comprises an A/D converter (21), a computer PC end (22) and a gate (23), the photoelectric tube (1) is connected with the computer PC end (22), the A/D converter (21) is further arranged between the photoelectric tube (1) and the computer PC end (22), the gate (23) is respectively communicated with the photoelectric tube (1), the phase-locked amplification device (3) and the computer PC end (22), and the phase-locked amplification device (3) comprises an amplifier (31), The phase-sensitive amplifier comprises a band-pass filter (32), a phase-sensitive detector (33) and a low-pass filter (34), wherein the amplifier (31), the band-pass filter (32), the phase-sensitive detector (33) and the low-pass filter (34) are sequentially connected.

2. The apparatus according to claim 1, wherein the apparatus comprises: the A/D converter (21), the computer PC end (22) and the gate (23) are combined to form a feedback loop, and the feedback loop judges the strength of the signal through a logic program.

3. The apparatus according to claim 1, wherein the apparatus comprises: the phase sensitive detector (33) is connected with the laser (5), the laser (5) can emit a reference signal with a specific frequency and input the reference signal, and the low-pass filter (34) is connected with the PC end (22) of the computer.

4. The apparatus according to claim 1, wherein the apparatus comprises: the A/D converter (21) is used for sampling signals sent by the photomultiplier (1), converting analog signals into digital signals, entering a computer PC (personal computer) end (22) for processing, sending an instruction to the gate (23) by the computer PC end (22) after the operation is finished, and if the signal intensity reaches a preset value, switching the gate (23) to input signals to the tail end of the computer and directly outputting the signals; if the signal intensity does not reach the preset value, the switch is shifted to the phase-locked amplifying device (3) to further reduce noise and amplify the signal.