Photosensitivity measuring device and method of photoelectric detector

Abstract

The device comprises an incident light source, a monochromator, a cassette, a calibration photoelectric detector, a photoelectric detector, a voltage and current measuring device and a processor, the incident light source forms a monochromatic light source through the monochromator, and the monochromatic light source irradiates the calibration photoelectric detector and the photoelectric detector respectively; the calibration photoelectric detector and the photoelectric detector are both located in the cassette and connected with the voltage and current measuring device, and the photoelectric level of the monochromatic source input into the calibration photoelectric detector and the photoelectric current of the monochromatic source input into the photoelectric detector are measured through the voltage and current measuring device. And the processor is connected with the voltage and current measuring device and is used for calculating the ratio of the measured light current of the monochromatic light source to the light level of the monochromatic light source to obtain the photosensitivity measurement result of the photoelectric detector. Compared with the prior art, the photosensitivity measurement process has the advantages of high sensitivity, high resolution, high response speed, strong anti-interference capability, accurate measurement result and the like.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric detector detection technology, and in particular to a photosensitivity measurement device and method for a photoelectric detector. Background Art

[0002] There are many types of photodetectors. How to judge the quality of photodetectors and how to screen them reasonably based on specific technical parameters are issues that urgently need to be solved. The constructed detector framework must find out the parameters that can reflect the characteristics of photodetectors.

[0003] Photosensitivity (sensitivity is often called responsivity) is a measure of the photoelectric conversion characteristics, spectral characteristics of photoelectric conversion, and frequency characteristics of a photodetector.

[0004] Photosensitivity refers to the sensitivity of an object to light or its photosensitivity, where MPPC is able to detect single photons. Therefore, photosensitivity is expressed as the ratio of the MPPC output current (analog value) to the amount of light continuously incident on the MPPC, and is related to quantum efficiency, fill factor, and avalanche probability. However, photosensitivity measurement devices are susceptible to interference and are sensitive to environmental changes. Changes in factors such as temperature, humidity, and light will directly affect their performance. This limits their use under certain conditions.

[0005] When photosensitivity is measured, objects installed in different shapes need to be measured using a unified measurement method, and sometimes they also need to be adjusted based on the influence of various environments.

[0006] At the same time, the frequency response can also be measured. Based on the close relationship between the energy and frequency of photons, the frequency response can be explained by the Planck-Einstein relationship. The energy of a photon is proportional to its frequency. The higher the energy of the photon, the higher the frequency. The relationship between the energy and frequency of photons plays an important role in the study of the electromagnetic spectrum, helping scientists to gain a deeper understanding of the properties and structure of matter. The formula for calculating photon energy is:

[0007] E=hc / λ=hf

[0008] The energy of a photon = Planck's constant * speed of light / wavelength = Planck's constant * frequency of light.

[0009] After obtaining accurate measurements, transient absorption spectroscopy can be used in the biological field, which is widely used to study the structure and dynamics of biological molecules. By measuring the dynamic process of biological macromolecules such as proteins, enzymes and nucleic acids in the excited state, their conformational changes, reaction mechanisms and functional regulation can be revealed. By measuring the excited state lifetime of enzymes during catalysis by transient absorption spectroscopy, its reaction mechanism and underlying physical and chemical change effects can be deeply understood. Summary of the invention

[0010] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a device and method for measuring the photosensitivity of a photoelectric detector with high sensitivity, high resolution, strong anti-interference ability and accurate measurement results.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] A device for measuring the photosensitivity of a photodetector, comprising an incident light source, a monochromator, a dark box, a calibration photodetector, a photodetector, a voltage and current measuring device and a processor, wherein the incident light source passes through the monochromator to form a monochromatic light source, and is respectively irradiated to the calibration photodetector and the photodetector; the calibration photodetector and the photodetector are both located in the dark box and are both connected to the voltage and current measuring device, and the light level of the monochromatic light source input to the calibration photodetector and the photocurrent of the monochromatic light source input to the photodetector are respectively measured by the voltage and current measuring device;

[0013] The processor is connected to the voltage and current measuring device and is used to calculate the ratio of the measured photocurrent of the monochromatic light source to the light level of the monochromatic light source to obtain the photosensitivity measurement result of the photodetector.

[0014] Furthermore, there are multiple incident light sources, and the multiple incident light sources converge to form white light to be input into the monochromator.

[0015] Furthermore, the voltage and current measuring device is a power meter.

[0016] Furthermore, the voltage and current measuring device is a multimeter.

[0017] The present invention also provides a photosensitivity measuring device of a photodetector as described above, comprising the following steps:

[0018] The incident light source is processed by a monochromator to form a monochromatic light source;

[0019] detecting incident light from a monochromatic light source by a calibrated photodetector located in the dark box, and measuring a corresponding light level by a voltage and current measuring device based on the output of the calibrated photodetector;

[0020] The calibrated photodetector in the dark box is replaced by a photodetector, incident light from a monochromatic light source is detected by the photodetector, and a corresponding photocurrent is measured by a voltage and current measuring device according to the output of the photodetector;

[0021] The processor divides the measured photocurrent by the light level, and the resulting ratio is the photosensitivity of the photodetector.

[0022] Furthermore, the method also includes: arranging a plurality of incident light sources to converge to form white light to be input into a monochromator for processing.

[0023] Furthermore, the method also includes: judging the performance of the photodetector according to the photosensitivity measurement result of the photodetector.

[0024] Furthermore, the method further comprises: measuring the frequency response of the photodetector output to calculate the photon energy.

[0025] Furthermore, the method also includes: inferring the wavelength of the substance being measured based on the calculated photon energy, thereby analyzing various physical atomic structures and molecular motion changes in the microscopic world.

[0026] Furthermore, the application fields of the process of analyzing the physical atomic structure and molecular motion changes of various microscopic worlds include the biological field.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) Strong anti-interference ability and accurate measurement results. The present invention designs a dark box, and measures the light level of a monochromatic light source through a calibrated photodetector in the dark box, and measures the photocurrent of the monochromatic light source through a photodetector, thereby taking a ratio and obtaining a measurement result of photosensitivity. The test environment of the dark box can effectively reduce interference from external light and other light sources, ensuring that only the light signal of the incident light source is collected and measured, so that the measurement result is more accurate.

[0029] (2) High sensitivity and high resolution. The present invention forms white light with all colors from red to purple by converging multiple incident light sources. The monochromator selects characteristic wavelengths for processing at will. It has a wide spectral range and fineness, and can effectively detect and identify weak light signals and different wavelengths.

[0030] (3) Fast response speed. It can achieve fast response of optical signals in a short time.

[0031] (4) The present invention can calculate the wavelength of the substance being measured by measuring the energy of photons, and analyze various physical atomic structures and molecular motion changes in the microscopic world.

[0032] (5) The present invention can analyze certain physical, chemical and biological processes through accurate frequency measurement. It can also analyze the microscopic world by absorbing the frequency changes when one equilibrium state changes to another. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a photosensitivity measuring device for a photodetector provided in an embodiment of the present invention;

[0034] In the figure, 1. incident light source, 2. white light, 3. monochromator, 4. monochromatic light source, 5. dark box, 6. calibrated photodetector or photodetector, 7. voltage and current measuring device. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides a photosensitivity measuring device for a photodetector, comprising an incident light source 1, a monochromator 3, a dark box 5, a calibration photodetector 6, a photodetector, a voltage and current measuring device 7 and a processor. The incident light source 1 passes through the monochromator 3 to form a monochromatic light source 4, and shines on the calibration photodetector 6 and the photodetector respectively; the calibration photodetector 6 and the photodetector are both located in the dark box 5, and are both connected to the voltage and current measuring device 7, and the light level of the monochromatic light source 4 input to the calibration photodetector 6 and the photocurrent of the monochromatic light source 4 input to the photodetector are measured respectively through the voltage and current measuring device 7;

[0041] The processor is connected to the voltage and current measuring device 7 and is used to calculate the ratio of the measured photocurrent of the monochromatic light source 4 to the light level of the monochromatic light source 4 to obtain the photosensitivity measurement result of the photodetector.

[0042] Preferably, there are multiple incident light sources 1 , and the multiple incident light sources 1 converge to form white light 2 which is input into the monochromator 3 .

[0043] The resulting white light has all the colors from red to violet, which are distributed continuously across the visible spectrum.

[0044] After the white light enters the monochromator 3 for processing, the monochromator 3 can be set according to requirements to select a specific wavelength to form a monochromatic light source.

[0045] The corresponding wavelength of the light beam can be switched and selected for measurement according to actual needs.

[0046] The voltage and current measuring device 7 can be selected as a power meter or a multimeter.

[0047] The working process of the above device is:

[0048] The incident light source 1 is processed by the monochromator 3 to form a monochromatic light source 4. The incident light from the monochromatic light source 4 is detected by the calibration photodetector 6 in the dark box 5, and the light level incident on the calibration photodetector 6 is found from the output. Then, the photodetector MPPC6 is placed in the dark box instead of the calibration photodetector 6 to perform the same measurement, and the photocurrent of the photodetector MPPC6 is measured.

[0049] This embodiment also provides a method for measuring the photosensitivity of a photodetector as described above, comprising the following steps:

[0050] The incident light source 1 is processed by a monochromator 3 to form a monochromatic light source 4;

[0051] The incident light from the monochromatic light source 4 is detected by a calibrated photodetector 6 located in the dark box 5, and the corresponding light level is measured by a voltage and current measuring device 7 according to the output of the calibrated photodetector 6;

[0052] The calibration photodetector 6 in the dark box 5 is replaced by a photodetector, the incident light from the monochromatic light source 4 is detected by the photodetector, and the corresponding photocurrent is measured by the voltage and current measuring device 7 according to the output of the photodetector;

[0053] The processor divides the measured photocurrent by the light level, and the resulting ratio is the photosensitivity of the photodetector.

[0054] Preferably, the method further comprises: arranging a plurality of incident light sources 1 to converge to form white light 2 to input into a monochromator 3 for processing.

[0055] In this embodiment, the processing process of the above method includes:

[0056] The incident light source 1 is processed by the monochromator 3 to form a monochromatic light source 4. The incident light from the monochromatic light source 4 is detected by the calibration photodetector 6 in the dark box 5, and the light level incident on the calibration photodetector 6 is found from the output. Then, the MPPC 6 is placed in the dark box to replace the calibration photodetector 6 for the same measurement, and the photocurrent of the MPPC is measured. The ratio obtained by dividing the measured MPPC photocurrent by the light level incident on the MPPC is the photosensitivity of the MPPC.

[0057] Preferably, the method further comprises: judging the performance of the photodetector according to a measurement result of the photosensitivity of the photodetector.

[0058] Preferably, the method further comprises: measuring the frequency response of the photodetector output to calculate the photon energy.

[0059] The relationship between the energy and frequency of photons plays an important role in the study of the electromagnetic spectrum, helping scientists gain a deeper understanding of the properties and structure of matter.

[0060] Preferably, the method further includes: inferring the wavelength of the substance being measured based on the calculated photon energy, thereby analyzing various physical atomic structures and molecular motion changes in the microscopic world.

[0061] Preferably, the application fields of analyzing the processes of changes in physical atomic structures and molecular motions in various microscopic worlds include the biological field.

[0062] For example, accurate measurements can be obtained in the field of biology, such as transient absorption spectroscopy, which is widely used to study the structure and dynamics of biological molecules. By measuring the dynamics of biological macromolecules such as proteins, enzymes and nucleic acids in excited states, their conformational changes, reaction mechanisms and functional regulation can be revealed. By measuring the excited state lifetime of enzymes during catalysis through transient absorption spectroscopy, we can gain a deep understanding of their reaction mechanisms and the underlying physical and chemical changes.

[0063] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A device for measuring the photosensitivity of a photodetector, characterized in that: The invention comprises an incident light source (1), a monochromator (3), a dark box (5), a calibration photodetector (6), a photodetector, a voltage and current measuring device (7) and a processor, wherein the incident light source (1) passes through the monochromator (3) to form a monochromatic light source (4), and shines on the calibration photodetector (6) and the photodetector respectively; the calibration photodetector (6) and the photodetector are both located in the dark box (5) and are both connected to the voltage and current measuring device (7), and the light level of the monochromatic light source (4) input to the calibration photodetector (6) and the photocurrent of the monochromatic light source (4) input to the photodetector are respectively measured by the voltage and current measuring device (7); The processor is connected to a voltage and current measuring device (7) and is used to calculate the ratio of the measured photocurrent of the monochromatic light source (4) to the light level of the monochromatic light source (4) to obtain a photosensitivity measurement result of the photodetector.

2. The device for measuring the photosensitivity of a photodetector according to claim 1, characterized in that: The number of the incident light sources (1) is multiple, and the multiple incident light sources (1) converge to form white light (2) which is input into the monochromator (3).

3. The device for measuring photosensitivity of a photodetector according to claim 1, characterized in that: The voltage and current measuring device (7) is a power meter.

4. The device for measuring the photosensitivity of a photodetector according to claim 1, characterized in that: The voltage and current measuring device (7) is a multimeter.

5. A method for measuring photosensitivity of a photosensitivity measuring device of a photodetector according to any one of claims 1 to 4, characterized in that: The following steps are involved: Processing the incident light source (1) through a monochromator (3) to form a monochromatic light source (4); The incident light from the monochromatic light source (4) is detected by a calibration photodetector (6) located in the dark box (5), and the corresponding light level is measured by a voltage and current measuring device (7) according to the output of the calibration photodetector (6); The calibration photodetector (6) in the dark box (5) is replaced by a photodetector, the incident light from the monochromatic light source (4) is detected by the photodetector, and the corresponding photocurrent is measured by a voltage and current measuring device (7) according to the output of the photodetector; The processor divides the measured photocurrent by the light level, and the resulting ratio is the photosensitivity of the photodetector.

6. The method according to claim 5, characterized in that The method further comprises: arranging a plurality of incident light sources (1) to converge and form white light (2) for input into a monochromator (3) for processing.

7. The method according to claim 5, characterized in that The method further includes: judging the performance of the photodetector according to the photosensitivity measurement result of the photodetector.

8. The method according to claim 5, characterized in that The method also includes measuring a frequency response of the photodetector output to calculate the photon energy.

9. The method according to claim 8, characterized in that The method also includes: inferring the wavelength of the measured substance according to the calculated photon energy, thereby analyzing the physical atomic structure and molecular motion changes of various microscopic worlds.

10. The method according to claim 9, characterized in that The application fields of the process of analyzing the physical atomic structure and molecular motion changes of various microscopic worlds include the biological field.

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