CN112710389A - Light detecting device - Google Patents
Light detecting device Download PDFInfo
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- CN112710389A CN112710389A CN201911014639.4A CN201911014639A CN112710389A CN 112710389 A CN112710389 A CN 112710389A CN 201911014639 A CN201911014639 A CN 201911014639A CN 112710389 A CN112710389 A CN 112710389A
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- detection device
- detecting
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- 238000001514 detection method Methods 0.000 claims abstract description 77
- 230000010354 integration Effects 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 6
- 238000013213 extrapolation Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 229910044991 metal oxide Inorganic materials 0.000 claims description 2
- 150000004706 metal oxides Chemical class 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 230000003287 optical effect Effects 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011896 sensitive detection Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2803—Investigating the spectrum using photoelectric array detector
Abstract
A light detection device is suitable for detecting light to be detected with intensity change emitted by a light source. The optical detection device comprises an array spectrometer, a photoelectric detector and a central control unit. The array spectrometer is suitable for detecting a strong light part of the light to be detected and outputting a first detection signal. The photoelectric detector is arranged beside the array spectrometer and is suitable for detecting a weak light part of the light to be detected and outputting a second detection signal. The central control unit comprises an operation module, and the operation module performs operation integration on the first detection signal and the second detection signal to obtain a light intensity change related to the light to be detected. The invention can be used for detecting continuous and multiple-change light to be detected emitted by the light source, and has the advantages of quick detection and high sensitivity.
Description
Technical Field
The present invention relates to an optical detection device, and more particularly, to an optical detection device with good detection sensitivity for strong light and weak light and fast detection.
Background
Array spectrometers can be used to measure light intensity, but measuring the Dynamic range of light intensity using array spectrometers (Dynamic range) is affected by exposure time, light intensity. Array spectrometers perform well when used to detect bright light, but because of their low sensitivity to weak light (e.g., 1 lumen), the exposure time needs to be extended when detecting weak light, but when the exposure time is increased, the measurement time and Thermal noise (Thermal noise) are also increased. Although the optical detection can be carried out by matching with a cooling device at present to achieve the effect of suppressing the thermal noise, the problem of prolonging the measurement time can not be improved, and the cooling device can possibly reduce the measurement responsivity of the array spectrometer and needs to increase the required exposure time. Therefore, how to increase the sensitivity of the measuring instrument, so that the measuring instrument has a good detection effect on weak light, and the detection time can be shortened is an important subject.
Disclosure of Invention
The invention aims to provide a light detection device with high detection speed and high sensitivity.
The light detection device is suitable for detecting the light to be detected with intensity change emitted by the light source. The optical detection device comprises an array spectrometer, a photoelectric detector and a central control unit.
The array spectrometer is suitable for detecting a strong light part of the light to be detected and outputting a first detection signal. The photoelectric detector is arranged beside the array spectrometer and is suitable for detecting a weak light part of the light to be detected and outputting a second detection signal. The central control unit is in signal connection with the array spectrometer and the photoelectric detector and comprises an operation module, and the operation module is used for performing operation integration on the first detection signal and the second detection signal so as to obtain a light intensity change related to the light to be detected.
In the light detection device of the present invention, the operation module performs operation integration on the first and second detection signals according to a linear extrapolation method to obtain the light intensity variation related to the light to be detected.
The light intensity range of the light detection device of the invention, which can be detected by the array type spectrometer, is more than or equal to 106Particle photons/second.
In the light detection device of the present invention, the light intensity range detected by the photodetector is greater than or equal to 1 photonPer second, and less than or equal to 1010Particle photons/second.
The array spectrometer comprises a plurality of photosensitive elements for detecting the strong light part of the light to be detected, wherein the photosensitive elements are photosensitive coupling elements or complementary metal oxide semiconductor photosensitive elements respectively.
In the light detecting device of the present invention, the photodetector includes an aperture for adjusting the light intensity of the weak light portion of the light to be detected.
In the light detection device of the present invention, the photodetector is a photomultiplier, an avalanche photodiode, or a photosensor.
The light detection device further comprises a light conduction unit which is suitable for conducting the light to be detected from the light source to the array spectrometer and the photoelectric detector.
In the light detection device of the present invention, the light conducting unit includes a first fiber module and a second fiber module.
The first optical fiber module is in signal connection between the light source and the array spectrometer and is used for transmitting the strong light part of the light to be measured to the array spectrometer.
The second optical fiber module is connected between the light source and the photoelectric detector in a signal mode and used for transmitting the weak light part of the light to be detected to the photoelectric detector.
In the optical detection device of the present invention, the first optical fiber module includes a plurality of first optical fibers, and the second optical fiber module includes a second optical fiber.
The invention has the beneficial effects that: the array spectrometer is used for detecting the strong light part of the light to be detected, and the high sensitivity and the quick detection capability of the photoelectric detector on the weak light part are matched, so that the array spectrometer can be used for detecting continuous and multiple-change light to be detected emitted by the light source, and the detection is quick and high in sensitivity.
Drawings
Other features and effects of the present invention will be clearly apparent from the embodiments with reference to the drawings:
FIG. 1 is a schematic view of a light detecting device according to an embodiment of the present invention;
FIG. 2 is a functional block diagram of the embodiment;
FIG. 3 is a schematic view of an implementation of a light-conducting unit of the embodiment; and
fig. 4 is a diagram illustrating the relationship between the variation of the light intensity of the light to be measured and the input power, in which a first detection signal (curve 1) and a second detection signal (curve 2) are integrated to obtain a variation of the light intensity (curve 3) related to the light to be measured.
Detailed Description
Referring to fig. 1, 2, 3 and 4, an embodiment of the light detecting device of the present invention is suitable for detecting a light to be detected with intensity variation emitted from a light source 1. The light detection device of the present embodiment includes an array spectrometer 2, a photodetector 3, a light conducting unit 4, and a central control unit 5.
The array spectrometer 2 is adapted to detect a strong light portion of the light to be detected and output a first detection signal according to the detection result. The array spectrometer 2 can detect light intensity in a range of 10 or more6Particles per second and can therefore be used to detect intense light. The array spectrometer 2 includes a plurality of photosensitive elements 21 for detecting the strong light portion of the light to be measured, and each of the photosensitive elements 21 is a Charge Coupled Device (CCD) or a Complementary Metal-Oxide-Semiconductor (CMOS) photosensitive element, but is not limited thereto.
The photodetector 3 is located beside the array spectrometer 2 and is adapted to detect a weak light portion of the light to be detected and output a second detection signal according to the detection result. In this embodiment, the photo detector 3 includes an aperture 31, the aperture 31 adjusts the light intensity of the weak light portion of the light to be detected, and then the photo detector 3 converts the adjusted weak light portion of the light to be detected into an electrical signal to detect the light intensity of the weak light portion to output the second detection signal. The photoelectric detector 3 has high detection sensitivity and excellent and rapid detection capability for weak lightThe light intensity range detectable by the photodetector 3 is greater than or equal to 1 photon/second and less than or equal to 10 photons/second10Particles per second and can therefore be used to detect weak light. The photodetector 3 is, for example, a Photomultiplier tube (PMT), an Avalanche Photodiode (APD), or a photosensor (Photo sensor).
The light conducting unit 4 is adapted to conduct the light to be measured emitted from the light source 1 to the array spectrometer 2 and the photodetector 3. In this embodiment, the light conducting unit 4 comprises a first fiber module 41 connected between the light source 1 and the array spectrometer 2, and a second fiber module 42 connected between the light source 1 and the photodetector 3. The first optical fiber module 41 is used for transmitting the strong light part of the light to be measured to the array spectrometer 2. The second fiber optic module 42 is used to transmit the weak light portion of the light to be measured to the photodetector 3. It should be noted that, in this embodiment, the first fiber optic module 41 includes a plurality of first optical fibers 411 (for example, six first optical fibers 411), and the second fiber optic module 42 includes a second optical fiber 421, but is not limited thereto. The strong light portion of the light to be measured refers to the light signal transmitted by the first optical fiber 411, and the weak light portion of the light to be measured refers to the light signal transmitted by the second optical fiber 421.
The central control unit 5 is connected with the array spectrometer 2 and the photoelectric detector 3 by signals. The central control unit 5 is, for example, a computer having an arithmetic function, and includes an arithmetic module 51. The operation module 51 performs operation integration on the first detection signal (e.g., curve 1 in fig. 4) and the second detection signal (e.g., curve 2 in fig. 4) to obtain a light intensity variation (e.g., curve 3 in fig. 4) related to the light to be detected.
In detail, when the present invention is used, the light source 1 is activated to emit the light to be detected, the light source 1 is, for example, a light emitting diode, and the light emitting intensity of the light source 1 is changed according to the magnitude of an input power. For example, a current or a voltage may be applied to the light source 1 as the input power. In the present embodiment, the applied voltage is taken as an example, and the input power on the abscissa axis of fig. 4 is a voltage value. The light to be measured is transmitted to the array spectrometer 2 and the photodetector 3 through the light transmission unit 4. Because the light intensity of the light to be detected has intensity change, the array spectrometer 2 is matched with the photoelectric detector 3, the array spectrometer and the photoelectric detector respectively have sensitive detection on strong light and weak light, and the detectable ranges of the array spectrometer and the photoelectric detector are partially overlapped. When the light to be measured changes to a high intensity and a high brightness, the array spectrometer 2 is responsible for the main light intensity detection, and correspondingly, when the light to be measured changes to a low intensity and a low brightness, the photodetector 3 is responsible for the main light intensity detection. The array spectrometer 2 and the photodetector 3 respectively output the first detection signal and the second detection signal to the central control unit 5 after detection, and the operation module 51 performs operation integration on the first detection signal and the second detection signal according to a linear extrapolation method, so as to obtain the light intensity change related to the light to be detected.
It should be noted that, in fig. 4, a curve 1 for representing the first detection signal and a curve 2 for representing the second detection signal only represent curve driving force and not absolute specific values. Since the array spectrometer 2 is less sensitive to detect light with lower intensity, the front-end signal of the first detection signal fluctuates and is more noisy as shown in the curve 1. Therefore, the measurement result of the curve 2 is mainly used in the range of lower light intensity. The operation module 51 performs operation correction on the first and second detection signals by the linear extrapolation method to integrate the first and second detection signals and obtain the curve 3. For example, if the reading value of the light intensity signal at the circle mark in the curve 1 is 1, which corresponds to the reading value of the light intensity signal at the circle mark in the curve 2 being 10, the linear extrapolation method is used to calculate the curves 1 and 2 to obtain the point where the reading value of the curve 2 is 9, which corresponds to the point where the reading value of the curve 1 is 0.9, and so on. Thus, the corresponding relationship between the curve 1 and the curve 2 can be obtained, and the curve 1 is mapped to the curve 2 to obtain the curve 3. It should be noted that, in the example of the present embodiment, the curve 3 only shows the driving force of the light intensity variation, and is not used to represent a specific value.
In summary, the array spectrometer 2 is mainly used for detecting the strong light portion of the light to be detected, and the high sensitivity and the fast detection capability of the photodetector 3 for weak light are matched for detecting the weak light portion of the light to be detected, so as to solve the problem that the exposure time needs to be prolonged during weak light detection when the array spectrometer is used for detecting light in the past. Therefore, the present invention can be used for detecting continuous and multiple-change light to be detected emitted by the light source 1, and can detect both strong light and weak light parts in the light source with high sensitivity and high speed. The optical detection device combining the array spectrometer 2 and the photoelectric detector 3 has fast detection time, and the detection time is more than 10 times faster than that of the prior art which only adopts the array spectrometer for detection.
The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and the invention is still within the scope of the present invention by simple equivalent changes and modifications made according to the claims and the contents of the specification.
Claims (10)
1. A light detecting device for detecting a light to be detected with intensity variation from a light source, the light detecting device comprising:
the array spectrometer is suitable for detecting a strong light part of the light to be detected and outputting a first detection signal;
the photoelectric detector is positioned beside the array spectrometer and is suitable for detecting a weak light part of the light to be detected and outputting a second detection signal; and
the central control unit is in signal connection with the array spectrometer and the photoelectric detector and comprises an operation module, and the operation module is used for performing operation integration on the first detection signal and the second detection signal so as to obtain a light intensity change related to the light to be detected.
2. A light detection device as claimed in claim 1 wherein: the operation module performs operation integration on the first detection signal and the second detection signal according to a linear extrapolation method to obtain the light intensity change related to the light to be detected.
3. A light detection device as claimed in claim 1 wherein: the array spectrometer can detect light intensity with a range of 10 or more6Particle photons/second.
4. A light detection device as claimed in claim 3 wherein: the light intensity range detected by the photoelectric detector is more than or equal to 1 photon/second and less than or equal to 10 photons/second10Particle photons/second.
5. A light detection device as claimed in claim 1 wherein: the array spectrometer comprises a plurality of photosensitive elements for detecting the strong light part of the light to be detected, wherein the photosensitive elements are photosensitive coupling elements or complementary metal oxide semiconductor photosensitive elements respectively.
6. A light detection device as claimed in claim 1 wherein: the photodetector includes an aperture for adjusting the light intensity of the weak light portion of the light to be detected.
7. A light detection device as claimed in claim 1 wherein: the photodetector is a photomultiplier tube, an avalanche photodiode, or a photosensor.
8. A light detection device as claimed in claim 1 wherein: the array spectrometer further comprises a light conduction unit which is suitable for conducting the light to be measured from the light source to the array spectrometer and the photoelectric detector.
9. A light detection device as claimed in claim 8 wherein: the light-conducting unit comprises
A first fiber module, signal connected between the light source and the array spectrometer, for transmitting the strong light part of the light to be measured to the array spectrometer, an
And the second optical fiber module is in signal connection between the light source and the photoelectric detector and is used for transmitting the weak light part of the light to be detected to the photoelectric detector.
10. A light detection device as claimed in claim 9 wherein: the first fiber optic module includes a plurality of first optical fibers and the second fiber optic module includes a second optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911014639.4A CN112710389A (en) | 2019-10-24 | 2019-10-24 | Light detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911014639.4A CN112710389A (en) | 2019-10-24 | 2019-10-24 | Light detecting device |
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| CN112710389A true CN112710389A (en) | 2021-04-27 |
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Family Applications (1)
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| CN201911014639.4A Pending CN112710389A (en) | 2019-10-24 | 2019-10-24 | Light detecting device |
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2019
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