CN106932340B - Light detection system based on integrating sphere - Google Patents
Light detection system based on integrating sphere Download PDFInfo
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- CN106932340B CN106932340B CN201511026936.2A CN201511026936A CN106932340B CN 106932340 B CN106932340 B CN 106932340B CN 201511026936 A CN201511026936 A CN 201511026936A CN 106932340 B CN106932340 B CN 106932340B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
Abstract
The invention relates to the technical field of analysis and measurement in the instrument industry, and discloses an optical detection system based on an integrating sphere. The optical detection system based on the integrating sphere comprises a first spectrophotometer, a first integrating sphere and a first attenuator; the first spectrophotometer includes a first photodetector and a second photodetector; on a first detection light path of the light detection system, sample light enters the first integrating sphere from a first light through hole of the first integrating sphere after being transmitted or reflected by a sample, and exits from a second light through hole after being diffusely reflected by the inner surface of the first integrating sphere and enters a first light detector; on a second detection light path of the light detection system, the reference light enters a second light detector after being attenuated by the first attenuator. The detection system improves the signal detection mode of the existing integrating sphere product, simplifies the original detection circuit of the integrating sphere, reduces the cost of the integrating sphere, and can better complete the function of matching with a spectrophotometer to detect a sample.
Description
Technical Field
The invention relates to the technical field of analysis and measurement in the instrument industry, in particular to an integrating sphere-based optical detection system.
Background
When the existing integrating sphere product is matched with instruments such as a spectrophotometer and the like for testing, a detector carried by the integrating sphere is used for detecting signals. As shown in fig. 1, when a sample is detected, sample light a transmitted through or reflected by the sample and reference light B not transmitted through or reflected by the sample are subjected to diffuse reflection in an integrating sphere and then compared, so as to obtain a test result of the sample. In the detection light path of the transmitted sample light, the sample light A is reflected by the reflectors (reflectors 1 and 2), then enters the integrating sphere 3 through the sample 9, is diffusely reflected by the inner wall of the integrating sphere 3, and then is received by the detector 8 inside the integrating sphere 3, and meanwhile, in the detection light path of the reference light, the reference light is reflected by the reflector 7, enters the integrating sphere 3, and then is received by the detector 8. The method for measuring the sample light reflected by the sample is similar to the method for measuring the sample light transmitted by the sample, for example, in the detection light path of the sample light, the sample light is reflected by the reflectors 1 and 2 and then passes through the integrating sphere 3 directly to reach the surface of the sample 10, enters the integrating sphere 3 after being emitted by the sample 10, and is received by the detector 8 inside the integrating sphere 3 after being diffusely reflected by the inner wall of the integrating sphere 3. In addition, in order to cope with the detection of signals with wider range of wavelengths (such as 185nm to 3300nm), the integrating sphere also needs to use a plurality of detectors, which causes complexity of structure and waste of cost.
Disclosure of Invention
In order to solve the above problems, the present invention discloses an integrating sphere-based optical detection system, which can detect a sample signal passing through an integrating sphere and a reference signal after attenuation balance by using a signal detector of a spectrophotometer.
In order to solve the technical problem, the embodiment of the invention discloses an integrating sphere-based light detection system, which comprises a first spectrophotometer, a first integrating sphere and a first attenuator, wherein the first spectrophotometer is connected with the first attenuator;
the first spectrophotometer includes a first photodetector and a second photodetector;
the first integrating sphere is a cavity sphere with the inner wall coated with diffuse reflection materials, and comprises a first light through hole and a second light through hole;
on a first detection light path of the light detection system, sample light enters the first integrating sphere from a first light through hole of the first integrating sphere after being transmitted or reflected by a sample, and exits from a second light through hole after being diffusely reflected by the inner surface of the first integrating sphere and enters a first light detector; on a second detection light path of the light detection system, the reference light enters a second light detector after being attenuated by the first attenuator.
The signal detection mode of the existing integrating sphere product is improved, and the sample light passing through the integrating sphere and the reference light passing through the attenuation balance are detected by using the signal detector of the spectrophotometer commonly used in the integrating sphere measurement, so that the original detection circuit of the integrating sphere is simplified, the cost of the integrating sphere is reduced, and the better effect of matching the integrating sphere and the spectrophotometer to detect the sample can be realized.
In a preferred embodiment, the attenuation ratio of the first attenuator to the reference light is equal to the attenuation ratio of the sample light that is not transmitted or reflected by the sample before and after entering the inner surface of the first integrating sphere for diffuse reflection.
Because the simplified integrating sphere has no detection circuit, the reference light does not enter the integrating sphere again during measurement, and in order to ensure the accuracy of the measurement result, the reference light needs to be attenuated to make the attenuation proportion the same as the supposed attenuation proportion after entering the integrating sphere, even if the attenuation proportion is the same as the attenuation proportion before and after the sample light which is not transmitted or reflected by the sample enters the integrating sphere for diffuse reflection, so that the attenuation proportion of the first attenuator is the attenuation proportion determined when the reference light and the sample light when the blank sample is subjected to energy balance.
In another preferred embodiment, the integrating-sphere-based light detection system further comprises at least one mirror; on the first detection light path, the sample light reaches the sample after being reflected by the mirror.
The reflector can be used for focusing the sample light at the detected sample, so that the energy loss is reduced.
In another preferred embodiment, the integrating-sphere-based optical detection system includes a first reflecting mirror and a second reflecting mirror, and the sample light reaches the sample after being reflected by the first reflecting mirror and the second reflecting mirror in sequence on the first detection light path.
The embodiment of the invention also discloses a light detection system based on the integrating sphere, which is characterized by comprising a second spectrophotometer, a second integrating sphere and a second attenuator;
the second spectrophotometer comprises a third photodetector and a fourth photodetector;
the second integrating sphere is a cavity sphere with the inner wall coated with diffuse reflection materials, and comprises a third optical through hole, a fourth optical through hole and a fifth optical through hole;
on a third detection light path of the light detection system, sample light linearly passes through the second integrating sphere through the third light through hole and the fourth light through hole in sequence, reaches a sample, enters the second integrating sphere after being reflected by the sample, is emitted from the fifth light through hole after being diffusely reflected by the inner surface of the second integrating sphere and enters a third light detector; on a fourth detection light path of the light detection system, the reference light enters a fourth light detector after being attenuated by the second attenuator.
The signal detection mode of the existing integrating sphere product is improved, and the sample light passing through the integrating sphere and the reference light passing through the attenuation balance are detected by using the signal detector of the spectrophotometer commonly used in the integrating sphere measurement, so that the original detection circuit of the integrating sphere is simplified, the cost of the integrating sphere is reduced, and the better effect of matching the integrating sphere and the spectrophotometer to detect the sample can be realized.
In a preferred embodiment, in the third detection light path, the sample light enters the second integrating sphere from the fourth light through hole after being reflected by the sample.
In another preferred example, the second integrating sphere includes a sixth light passing hole;
and on the third detection light path, the sample light enters the second integrating sphere from the sixth light through hole after being reflected by the sample.
In another preferred example, the attenuation ratio of the second attenuator to the reference light is equal to the attenuation ratio before and after the sample light which is not reflected by the sample enters the inner surface of the second integrating sphere and is subjected to diffuse reflection.
Because the simplified integrating sphere is not provided with a detection circuit, reference light does not enter the integrating sphere again during measurement, and in order to ensure the accuracy of a measurement result, the reference light needs to be attenuated to be the same as the supposed attenuation proportion after entering the integrating sphere, even if the reference light is the same as the sample light which is not transmitted or reflected by a sample before and after entering the integrating sphere for diffuse reflection, so that the attenuation proportion of the second attenuator is determined when the reference light and the sample light when a blank sample is subjected to energy balance.
In another preferred embodiment, the integrating-sphere-based light detection system further comprises at least one mirror; on the third detection light path, the sample light enters the second integrating sphere from the third light through hole after being reflected by the reflecting mirror.
The reflector can be used for focusing the sample light at the detected sample, so that the energy loss is reduced.
In another preferred example, the optical detection system based on the integrating sphere includes a third reflector and a fourth reflector, and in the third detection light path, the sample light enters the second integrating sphere from the third light through hole after being reflected by the third reflector and the fourth reflector in sequence.
Drawings
FIG. 1 is a schematic diagram of a prior art integrating sphere based light measurement system;
FIG. 2 is a schematic structural diagram of an integrating sphere-based light measuring system according to a first embodiment of the present invention;
fig. 3 is a schematic configuration diagram of an integrating sphere-based light measuring system according to a second embodiment of the present invention.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present invention. However, it will be understood by those skilled in the art that the claimed embodiments of the present invention may be practiced without these specific details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings below, the same or similar reference numerals denote the same or similar parts and components, and a description thereof may be omitted.
A first embodiment of the present invention relates to a photodetection system based on an integrating sphere. Fig. 2 is a schematic structural diagram of the optical detection system based on the integrating sphere.
Specifically, as shown in fig. 2, the integrating-sphere-based optical detection system includes a first spectrophotometer, a first integrating sphere 3, and a first attenuator 4; the first spectrophotometer includes a first photodetector 5 and a second photodetector 6; first integrating sphere 3 is a hollow sphere whose inner wall is coated with a diffuse reflection material (e.g., white diffuse reflection material magnesium oxide or barium sulfate, etc.), and includes a first light passing hole and a second light passing hole (not shown); on a first detection light path of the light detection system, sample light a is transmitted (or reflected) through a sample 9, enters the first integrating sphere from a first light through hole of the first integrating sphere 3, is diffusely reflected by the inner surface of the first integrating sphere, exits from a second light through hole and enters the first photodetector 5, and in specific implementation, the second light through hole can be as close to the first photodetector 5 as possible to increase the intensity of a detection signal; on the second detection light path of the light detection system, the reference light is attenuated by the first attenuator 4 and enters the second light detector 6. The attenuation ratio of the first attenuator 4 to the reference light is equal to the attenuation ratio before and after the sample light a which is not transmitted or reflected by the sample enters the inner surface of the first integrating sphere to be diffusely reflected.
Because the simplified integrating sphere has no detection circuit, the reference light does not enter the integrating sphere again during measurement, and in order to ensure the accuracy of the measurement result, the reference light needs to be attenuated to make the attenuation proportion the same as the supposed attenuation proportion after entering the integrating sphere, even if the attenuation proportion is the same as the attenuation proportion before and after the sample light which is not transmitted or reflected by the sample enters the integrating sphere for diffuse reflection, so that the attenuation proportion of the first attenuator is the attenuation proportion determined when the reference light and the sample light when the blank sample is subjected to energy balance.
The reflector can be used for focusing the sample light at the detected sample, so that the energy loss is reduced. Therefore, in a preferred embodiment, the integrating-sphere-based optical detection system further comprises at least one mirror; on the first detection light path, the sample light reaches the sample after being reflected by the mirror.
The arrangement of the reflecting mirrors may be determined according to the specific situation without limitation, for example, in a preferred embodiment, as shown in fig. 2, the integrating sphere-based optical detection system includes a first reflecting mirror 1 and a second reflecting mirror 2, and the sample light a reaches the sample 9 after being reflected by the first reflecting mirror 1 and the second reflecting mirror 2 in sequence on the first detection optical path.
In addition, it is understood that in the embodiments of the present invention, the optical through hole is a through hole through which the sample light or the reference light enters and exits the integrating sphere, and the specific shape is not limited. For example, it may be a single hole or a window consisting of a plurality of small holes.
The invention improves the signal detection mode of the existing integrating sphere product, and utilizes the signal detector of the spectrophotometer which is commonly used in the integrating sphere measurement to detect the sample light passing through the integrating sphere and the reference light after attenuation balance, thereby simplifying the original detection circuit of the integrating sphere, reducing the cost of the integrating sphere and better completing the function of matching and detecting the sample with the spectrophotometer.
The specific detection process of this embodiment is as follows:
in particular, the first integrating sphere 3 is placed in a sample chamber of a spectrophotometer, and a sample signal and a reference signal (i.e., sample light and reference light) in a blank sample state are balanced by an attenuator 4 in a completely light-shielded environment. Then, a sample 9 to be measured is placed in front of an inlet (i.e., a first optical through hole) of the first integrating sphere 3, a sample signal is detected by a detector (i.e., a first light detector 5) of the spectrophotometer, and the sample signal is compared with a reference signal after balancing to finally obtain test data.
A second embodiment of the invention discloses an integrating sphere based light detection system. Fig. 3 is a schematic diagram of the structure of the optical detection system based on the integrating sphere.
Specifically, as shown in fig. 3, the integrating-sphere-based light detection system includes a second spectrophotometer, a second integrating sphere 3 'and a second attenuator 4'; the second spectrophotometer comprises a third photodetector 5 'and a fourth photodetector 6'; the second integrating sphere 3 'is a hollow sphere with the inner wall coated with a diffuse reflection material, and the second integrating sphere 3' comprises a third light through hole, a fourth light through hole and a fifth light through hole (not shown); on a third detection light path of the light detection system, sample light A ' passes through a second integrating sphere in a straight line through a third light through hole and a fourth light through hole in sequence, reaches a sample 10, enters the second integrating sphere 3 ' after being reflected by the sample 10, exits from a fifth light through hole after being diffusely reflected by the inner surface of the second integrating sphere 3 ' and enters a third light detector 5 ', and in specific implementation, the second light through hole can be close to the third light detector 5 ' as much as possible so as to increase the intensity of a detection signal; on the fourth detection light path of the light detection system, the reference light is attenuated by the second attenuator 4 'and enters the fourth light detector 6'. The attenuation ratio of the second attenuator 4' to the reference light is equal to the attenuation ratio before and after the sample light which is not reflected by the sample enters the inner surface of the second integrating sphere for diffuse reflection.
Because the simplified integrating sphere is not provided with a detection circuit, reference light does not enter the integrating sphere again during measurement, and in order to ensure the accuracy of a measurement result, the reference light needs to be attenuated to be the same as the supposed attenuation proportion after entering the integrating sphere, even if the reference light is the same as the sample light which is not transmitted or reflected by a sample before and after entering the integrating sphere for diffuse reflection, so that the attenuation proportion of the second attenuator is determined when the reference light and the sample light when a blank sample is subjected to energy balance.
In the present invention, the sample light emitted by the sample 10 can return to the second integrating sphere 3 'through the fourth light through hole, or can enter the second integrating sphere 3' through other light through holes for diffuse reflection. For example, in a preferred embodiment, in the third detection light path, the sample light enters the second integrating sphere through the fourth light through hole after being reflected by the sample. In yet another preferred embodiment, the second integrating sphere includes a sixth light passing hole (not shown); and on the third detection light path, the sample light enters the second integrating sphere from the sixth light through hole after being reflected by the sample.
The reflector can be used for focusing the sample light at the detected sample, so that the energy loss is reduced. Therefore, in a preferred embodiment, the integrating-sphere-based optical detection system further comprises at least one mirror; on the third detection light path, the sample light enters the second integrating sphere from the third light through hole after being reflected by the reflecting mirror.
The arrangement of the reflecting mirrors may be determined according to specific situations, and is not limited herein, for example, in a preferred embodiment, the optical detection system based on the integrating sphere includes a third reflecting mirror 1 ' and a fourth reflecting mirror 2 ', and in the third detection optical path, the sample light a enters the second integrating sphere 3 ' from the third optical through hole after being reflected by the third reflecting mirror 1 ' and the fourth reflecting mirror 2 ' in sequence.
The signal detection mode of the existing integrating sphere product is improved, and the sample light passing through the integrating sphere and the reference light passing through the attenuation balance are detected by using the signal detector of the spectrophotometer commonly used in the integrating sphere measurement, so that the original detection circuit of the integrating sphere is simplified, the cost of the integrating sphere is reduced, and the better effect of matching the integrating sphere and the spectrophotometer to detect the sample can be realized.
It is to be noted that in the claims and the description of the present patent, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the use of the verb "comprise a" to define an element does not exclude the presence of another, same element in a process, method, article, or apparatus that comprises the element.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. An integrating-sphere-based optical detection system comprising a first spectrophotometer, a first integrating sphere, and a first attenuator;
the first spectrophotometer includes a first photodetector and a second photodetector;
the first integrating sphere is a hollow sphere with the inner wall coated with diffuse reflection materials, and comprises a first light through hole and a second light through hole;
on a first detection light path of the light detection system, sample light enters the first integrating sphere from a first light through hole of the first integrating sphere after being transmitted or reflected by a sample, and exits from a second light through hole after being diffusely reflected by the inner surface of the first integrating sphere and enters a first light detector; on a second detection light path of the light detection system, the reference light enters a second light detector after being attenuated by the first attenuator,
the attenuation ratio of the first attenuator to the reference light is equal to the attenuation ratio of the sample light which is not transmitted or reflected by the sample before and after entering the inner surface of the first integrating sphere for diffuse reflection.
2. The integrating-sphere-based light detecting system as recited in claim 1, further comprising at least one mirror; on the first detection light path, the sample light reaches the sample after being reflected by the mirror.
3. The integrating-sphere-based optical detection system of claim 2, comprising a first mirror and a second mirror, wherein the sample light reaches the sample after being reflected by the first mirror and the second mirror in sequence on the first detection light path.
4. An integrating-sphere-based optical detection system comprising a second spectrophotometer, a second integrating sphere, and a second attenuator;
the second spectrophotometer includes a third photodetector and a fourth photodetector;
the second integrating sphere is a cavity sphere with the inner wall coated with a diffuse reflection material, and comprises a third optical through hole, a fourth optical through hole and a fifth optical through hole;
on a third detection light path of the light detection system, sample light linearly passes through the second integrating sphere through the third light through hole and the fourth light through hole in sequence, enters the second integrating sphere after being reflected by the sample, is emitted from the fifth light through hole after being diffusely reflected by the inner surface of the second integrating sphere and enters a third light detector; on a fourth detection light path of the light detection system, the reference light enters a fourth light detector after being attenuated by the second attenuator,
the attenuation ratio of the second attenuator to the reference light is equal to the attenuation ratio of the sample light which is not reflected by the sample before and after entering the inner surface of the second integrating sphere for diffuse reflection.
5. The integrating-sphere-based light detecting system as recited in claim 4, wherein said sample light reflected by said sample enters said second integrating sphere through said fourth light passing hole on said third detecting light path.
6. The integrating-sphere-based light detecting system as recited in claim 4, wherein said second integrating sphere includes a sixth light passing hole;
on the third detection light path, the sample light enters the second integrating sphere from the sixth light through hole after being reflected by the sample.
7. The integrating-sphere-based light detecting system as recited in any one of claims 4 to 6, further comprising at least one mirror; on the third detection light path, the sample light enters the second integrating sphere from the third light through hole after being reflected by the reflecting mirror.
8. The integrating-sphere-based light detecting system according to claim 7, comprising a third mirror and a fourth mirror, wherein the sample light enters the second integrating sphere from the third light passing hole after being reflected by the third mirror and the fourth mirror in sequence on the third detection light path.
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| JPH0415528A (en) * | 1990-05-10 | 1992-01-20 | Toshiba Corp | Laser light attenuating device |
| CN200972457Y (en) * | 2006-09-28 | 2007-11-07 | 朱安生 | Investigater for ultraviolet transmissivity |
| CN102519915A (en) * | 2011-12-28 | 2012-06-27 | 北京奥博泰科技有限公司 | Spectral measuring device and method for spectral haze of photovoltaic glass |
| CN104458598A (en) * | 2014-12-12 | 2015-03-25 | 张晓勇 | Novel photoelectric property integrated test system |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0415528A (en) * | 1990-05-10 | 1992-01-20 | Toshiba Corp | Laser light attenuating device |
| CN200972457Y (en) * | 2006-09-28 | 2007-11-07 | 朱安生 | Investigater for ultraviolet transmissivity |
| CN102519915A (en) * | 2011-12-28 | 2012-06-27 | 北京奥博泰科技有限公司 | Spectral measuring device and method for spectral haze of photovoltaic glass |
| CN104458598A (en) * | 2014-12-12 | 2015-03-25 | 张晓勇 | Novel photoelectric property integrated test system |
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