CN111595553A

CN111595553A - Laser instrument stability test system

Info

Publication number: CN111595553A
Application number: CN202010399960.5A
Authority: CN
Inventors: 王晶; 张晓春; 杨永东; 高鹏; 汤青
Original assignee: Xinyi Health Management Co ltd; Ennova Health Technology Co ltd
Current assignee: Xinyi Health Management Co ltd; Ennova Health Technology Co ltd
Priority date: 2020-05-13
Filing date: 2020-05-13
Publication date: 2020-08-28

Abstract

The invention discloses a laser stability testing system, which consists of a polaroid dimming module, a PMT photometric module, a CPLD counting module and a testing result output module, wherein the strength of laser is weakened through the polaroid dimming module to be used as to-be-tested light, so that PMT testing is facilitated, the to-be-tested light is converted into an electric pulse signal by the PMT photometric module, the CPLD counting module counts the electric pulse signal, the testing result output module generates a laser testing trend graph and a data analysis result according to the counting result, and whether the stability of a laser meets the use requirement or not is judged according to the analysis result.

Description

Laser instrument stability test system

Technical Field

The application relates to the field of instrument detection, in particular to a laser stability testing system.

Background

In experimental processes such as Raman spectrum analysis, induced fluorescence, delayed luminescence and the like, a laser is used as an excitation light source. Currently, most laboratories generally use an optical power meter as a tool for determining whether a laser is stable. The optical power meter generally uses PIN or APD to convert light into an electrical signal, obtains a voltage signal after passing through an I/V conversion and amplification circuit, obtains a digital quantity representing the magnitude of optical power after a/D conversion, and displays the digital quantity on a screen. This scheme has problems of low resolution (1 microwatt) and poor real-time recording.

Disclosure of Invention

The application provides a laser instrument stability test system, solves prior art test laser instrument stability resolution ratio and hangs down, the poor problem of real-time record nature.

The application provides a laser instrument stability test system includes:

the polaroid dimming module consists of a polarizer and a 1/2 polaroid, is positioned between the laser and the PMT photometric module, and is used for obtaining polarized light in a light source emitted by the laser, weakening the intensity of the polarized light by rotating the angle of 1/2 polaroids, and sending the polarized light with weakened intensity to the PMT photometric module as light to be measured;

the PMT photometric module is positioned behind the polaroid dimming module and used for receiving light to be measured sent by the polaroid dimming module, converting the light to be measured into an electric pulse signal, multiplying and amplifying the electric pulse signal and then outputting the electric pulse signal;

the CPLD counting module is used for counting the electric pulse signals output by the PMT photometric module and sending counting results to the test result output module;

and the test result output module is used for receiving the counting result sent by the CPLD counting module, generating a laser test trend graph and a data analysis result according to the counting result, judging whether the stability of the laser meets the use requirement or not by combining the laser test trend graph and the data analysis result, and outputting the test result.

Preferably, after the polarized light with reduced intensity is sent to the PMT photometric module as light to be measured in the polarizer dimming module, the method further includes:

the PMT photometric module is used for detecting whether the light to be detected is identified by the PMT photometric module;

if the polarized light cannot be identified, the polarized light dimming module adjusts the intensity of the polarized light so that the PMT photometric module can identify the intensity of the polarized light.

Preferably, the method further comprises the following steps:

the PMT photometric module can identify polarized light and has an output frequency of 2000000HZ +/-50%.

Preferably, the PMT photometric module further includes: the amplifying circuit, the discriminating circuit and the conditioning circuit are used for amplifying, discriminating and conditioning the multiplied electric pulse signals and outputting TTL electric pulse signals.

Preferably, the CPLD counting module is configured to count the electrical pulse signals output by the PMT photometric module, and includes:

and the CPLD counting module is used for representing the magnitude of the optical power by collecting the frequency of the TTL electric pulse signal and finishing the counting of the electric pulse signal.

Preferably, the test result output module generates a laser test trend graph and a data analysis result according to the counting result, and includes:

the upper computer stores the counting result and generates a laser testing trend chart according to the counting result;

and the upper computer performs statistical analysis on the counting result and outputs the value, the minimum value and the average value in the statistical result.

Preferably, the method further comprises the following steps:

and the wireless transmission module is used for completing data transmission between the CPLD counting module and the test result output module.

The application provides a laser stability test system, which comprises a polaroid dimming module, a PMT photometric module, a CPLD counting module and a test result output module, wherein the intensity of laser is weakened by the polaroid dimming module to be used as light to be tested, so that the PMT can be conveniently tested, the PMT photometric module converts the light to be tested into an electric pulse signal,the CPLD counting module counts the electric pulse signals, the test result output module generates a laser test trend graph and a data analysis result according to the counting result, whether the stability of the laser meets the use requirement is judged according to the analysis result, and the test system has high resolution (10)^-3The picowatt) and the real-time property, and solves the problems of low stability and resolution and poor real-time recording performance of the laser in the prior art.

Drawings

FIG. 1 is a schematic diagram of a laser stability testing system provided in the present application;

FIG. 2 is a self-programming high level software interface to which the present application relates;

FIG. 3 is a graph of the trend of the better stability laser test to which the present application relates;

fig. 4 is a graph of the trend of the laser test for poor stability to which the present application relates.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.

Fig. 1 is a schematic structural diagram of a laser stability testing system provided in the present application, and as can be seen from fig. 1, the laser stability testing system is composed of a polarizer dimming module, a PMT metering module, a CPLD counting module, and a test result output module.

The polaroid dimming module consists of a polarizer and an 1/2 polaroid and is positioned between the laser and the PMT photometric module, the polarizer is used for obtaining polarized light in a light source emitted by the laser, the intensity of the polarized light is weakened by rotating the angle of the 1/2 polaroid, and the polarized light with the weakened intensity is sent to the PMT photometric module as to-be-measured light.

After the laser that awaits measuring is opened, debug the intensity that needs the test with the laser, the polarizer obtains the polarized light in the light source of laser transmission, weaken the intensity of polarized light through rotatory 1/2 polaroid angle, send the polarized light after weakening the intensity to PMT photometry module as awaiting measuring the light transmission, at this moment, PMT photometry module, it detects to treat photometry at first, because the intensity that the photometry module is treated photometry has the restriction, the frequency of output generally is 2000000HZ +/-50%, if treat that the intensity of photometry is too big, just lead to exceeding the frequency that PMT photometry module outputs, so, detect earlier whether waiting to measure the light and be discerned by PMT photometry module, if can not discern, the intensity of polaroid subtracts the module adjustment polarized light, so that PMT photometry module can discern the intensity of polarized light.

And the PMT photometric module is positioned behind the polaroid dimmer module and used for receiving the light to be measured sent by the polaroid dimmer module, converting the light to be measured into an electric pulse signal, and outputting the electric pulse signal after multiplication and amplification.

The PMT photometric module consists of PMT, amplifier circuit, discriminator and regulator circuit. The photocathode surface of the PMT emits electrons (external photoelectric effect) into vacuum under the excitation of photons, and then passes through each dynode in sequence under the action of an electric field to carry out secondary electron multiplication. And finally, the secondary electrons emitted by the final dynode are output through the anode. The output electric pulse signals are amplified, discriminated and conditioned, and then output in a TTL electric pulse signal mode. The optical power is represented by the frequency of the TTL pulse signal. The module has the characteristics of high sensitivity, high stability and low noise.

And the CPLD counting module is used for counting the electric pulse signals output by the PMT photometric module and sending counting results to the test result output module. And the frequency of the TTL electric pulse signals is collected to represent the magnitude of the optical power, so that the electric pulse signals are counted.

And the wireless transmission module is used for completing data transmission between the CPLD counting module and the test result output module. The CPLD counting module and the test result output module carry out wireless data and command transmission before the upper computer software module, a computer provided with the upper computer software module can be placed outside a dark room, testing is convenient, and influence of stray light of a computer screen on a test result is avoided. The application provides a test system, except that the computer of installing host computer software module arranges the darkroom in, polaroid dimmer module, PMT photometry module, CPLD count module to and the laser instrument of test all are located the darkroom, also avoid other stray light to cause the influence to the test result.

And the test result output module is mainly used for outputting the corresponding test result through the upper computer software module. The upper computer software module is designed based on a WPF framework, and the interface of the upper computer software module is shown in figure 2, so that the following functions can be realized:

1. setting parameters such as serial port number, baud rate, door control time and the like.

2. And storing the received counting result, wherein the counting result can be stored in a 'CSV' file format, and generating a laser testing trend chart according to the counting result.

3. And performing statistical analysis on the counting result, and outputting a value, a minimum value, an average value, a standard deviation and the like in the statistical result.

And then, judging whether the stability of the laser meets the use requirement or not according to the laser test trend graph and the statistical analysis result. Taking two lasers as an example, the test trend graphs of the two lasers are respectively output, as shown in fig. 3 and fig. 4, during the laser turn-on period, the trend line of fig. 4 is obviously stable, while the trend line of fig. 3 shows an oscillation phenomenon, which indicates that the laser represented by fig. 3 is more stable, and the laser represented by fig. 4 does not meet the use requirement.

The application provides a laser instrument stability test system, by polaroid dimmer module, PMT photometry module, CPLD count module and test result output module constitute, weaken the intensity of laser as waiting to survey the light through polaroid dimmer module, the PMT of being convenient for tests, PMT photometry module will wait to survey the light and will convert into electric pulse signal, CPLD count module is to electric pulse signalAnd counting, generating a laser test trend graph and a data analysis result by the test result output module according to the counting result, judging whether the stability of the laser meets the use requirement or not according to the analysis result, and designing the polaroid as a dimming module by the system. The rotation through the polaroid weakens the intensity of the laser that awaits measuring, and the PMT of being convenient for photometry carries out the photometry, uses PMT photometry module to carry out the light intensity and detects, has replaced APD photometry module of luminous power, has sensitivity height, the good advantage of stability, to sum up, this test system has that resolution ratio is high (10)^-3The picowatt) and the real-time property, and solves the problems of low stability and resolution and poor real-time recording performance of the laser in the prior art.

Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention.

Claims

1. A laser stability testing system, comprising:

2. The system of claim 1, wherein after the polarized light with reduced intensity is transmitted to the PMT metering module as the light to be measured in the polarizer dimming module, the system further comprises:

3. The system of claim 2, further comprising:

4. The system of claim 1, wherein the PMT metering module further comprises: the amplifying circuit, the discriminating circuit and the conditioning circuit are used for amplifying, discriminating and conditioning the multiplied electric pulse signals and outputting TTL electric pulse signals.

5. The system of claim 1, wherein the CPLD counting module is used for counting the electric pulse signals output by the PMT photometric module and comprises:

6. The system of claim 1, wherein the test result output module generates a laser test trend graph and a data analysis result according to the counting result, and comprises:

7. The system of claim 1, further comprising: