CN115326727A - Spectrum detection system and method - Google Patents
Spectrum detection system and method Download PDFInfo
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- CN115326727A CN115326727A CN202110511127.XA CN202110511127A CN115326727A CN 115326727 A CN115326727 A CN 115326727A CN 202110511127 A CN202110511127 A CN 202110511127A CN 115326727 A CN115326727 A CN 115326727A
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Abstract
The application discloses spectrum detection system is applied to and detects technical field. The system includes a light source assembly and a detector. The light source assembly is configured to generate a first probe beam and a second probe beam. The first probe beam is irradiated to the detected substance to generate a first beam to be detected. The second probe beam irradiates the detected substance to generate a second beam to be detected. The detector is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing mode, obtaining a first electric signal by demodulating the first light beam to be detected, and obtaining a second electric signal by demodulating the second light beam to be detected. In the application, two light beams to be detected share one detector, so that the number of the detectors can be reduced, and the cost of the spectrum detection system is reduced.
Description
Technical Field
The present application relates to the field of detection technologies, and in particular, to a system and a method for spectrum detection.
Background
The spectroscopic detection system can determine the chemical composition and relative content of the detected substances by spectroscopic analysis. In particular, a spectral detection system generally includes a light source assembly and a detector. The light source assembly is for generating a probe beam. When the probe beam irradiates the detected substance, the probe beam is reflected or transmitted to generate a beam to be detected. The detector is used for receiving the light beam to be detected and generating an electric signal according to the light beam to be detected. To facilitate viewing of the light beam to be detected, the electrical signal can be used to generate a spectrum of the substance being detected. Different substances possess different spectra. Therefore, by analyzing the spectrum of the detected substance, the chemical composition and relative content of the detected substance can be determined.
The price of the detector is expensive, which results in high overall cost of the spectrum detection system.
Disclosure of Invention
The application provides a spectrum detection system and a spectrum detection method, wherein two light beams to be detected share one detector, so that the number of the detectors can be reduced, and the cost of the spectrum detection system is reduced.
A first aspect of the present application provides a spectroscopic detection system. The spectral detection system includes a light source assembly and a detector. The light source assembly is used for generating a first detection light beam and a second detection light beam, and the transmission path of the first detection light beam is different from that of the second detection light beam. The first probe beam irradiates the detected substance to generate a first beam to be detected. The second probe beam irradiates the detected substance to generate a second beam to be detected. The detector is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing mode, obtaining a first electric signal by demodulating the first light beam to be detected, and obtaining a second electric signal by demodulating the second light beam to be detected.
In the present application, the detector receives the first light beam to be detected and the second light beam to be detected in a time-sharing manner, that is, the two light beams to be detected share one detector. Therefore, the number of detectors can be reduced, and the cost of the spectrum detection system is reduced.
In an alternative form of the first aspect, the detectable substance comprises a first detectable substance and a second detectable substance. The first probe beam irradiates the first detected substance to generate a first detection beam. The second probe beam irradiates the second detected substance to generate a second beam to be detected.
In an alternative form of the first aspect, the spectral detection system further includes a first optical fiber, a second optical fiber, and a combiner. The first optical fiber is used for transmitting a first light beam to be detected. The second optical fiber is used for transmitting a second light beam to be detected. Two input ports of the beam combiner are respectively connected with the first optical fiber and the second optical fiber. The beam combiner is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing mode through the two input ports and outputting the first light beam to be detected and the second light beam to be detected to the detector. The number of ports of the detector can be reduced by adding the beam combiner, so that the cost of the detector is reduced.
In an alternative form of the first aspect, the spectroscopic detection system further includes a target optical fiber. The input port of the target optical fiber is connected with the output port of the beam combiner. The target optical fiber is used for receiving the first light beam to be detected and the second light beam to be detected from the beam combiner in a time-sharing mode and outputting the first light beam to be detected and the second light beam to be detected to the detector. By adding the target optical fiber, the limitation on the position of the detector can be reduced, so that the flexibility of designing the spectrum detection system is improved.
In an alternative form of the first aspect, the first optical fiber is a multimode optical fiber. The sensitive wavelength bands of different detected substances are different, that is, the wavelength ranges of the first to-be-detected light beams are different for different detected substances. Multimode fibers can transmit a greater range of wavelengths, thereby increasing the species that can be detected.
In an alternative form of the first aspect, the target optical fiber is a multimode optical fiber. Wherein the sensitive wave bands of different detected substances are different. Thus, the wavelength ranges of the first and second light beams to be detected may be different. The multimode fiber can transmit a larger wavelength range, thereby increasing the types of substances which can be detected and improving the detection capability of the spectrum detection system.
In an alternative form of the first aspect, the spectral detection system further comprises an integrating sphere. The integrating sphere is connected with the input end of the first optical fiber. The integrating sphere can collect the first light beam to be detected, so that the loss of the first light beam to be detected is reduced, and the detection accuracy is improved.
In an alternative form of the first aspect, the light source assembly is adapted to generate the first probe light beam and the second probe light beam in a time-shared manner. The light source assembly is used for time-sharing control, so that the complexity of the spectrum detection system can be reduced, for example, the number of optical switches is reduced. Therefore, the cost of the spectrum detection system can be reduced.
In an alternative form of the first aspect, the spectral detection system further includes a first optical switch and a second optical switch. The first optical switch is on the transmission path of the first light beam to be detected. The second optical switch is arranged on the transmission path of the second light beam to be detected. The first optical switch is used for blocking the first light beam to be detected in a time-sharing mode. The second optical switch is used for blocking the second light beam to be detected in a time-sharing mode. The light switch is additionally arranged, so that the requirement on the light source assembly can be reduced, and the service life of the light source assembly is prolonged.
In an alternative form of the first aspect, the time interval between the first and second beams to be detected is greater than 10 milliseconds. When the detector receives the first light beam to be detected and the second light beam to be detected simultaneously, errors may occur in a detection result of the spectral detection system on the detected substance. By setting the time interval between the first light beam to be detected and the second light beam to be detected, the detector can be prevented from receiving the first light beam to be detected and the second light beam to be detected simultaneously, and therefore the detection accuracy is improved.
In an alternative form of the first aspect, the spectral detection system further includes a first beam splitter and a second beam splitter. The first beam splitter is used for receiving the first detection beam to obtain a first sub-beam and a second sub-beam. The first sub-beam irradiates the detected substance to generate a first beam to be detected. The second beam splitter is used for receiving the second detection beam to obtain a third sub-beam and a fourth sub-beam. The third sub-beam irradiates the detected substance to generate a second beam to be detected. The detector is used for receiving the first light beam to be detected, the second sub light beam, the second light beam to be detected and the fourth sub light beam in a time-sharing mode, obtaining a third electric signal by demodulating the second sub light beam, and obtaining a fourth electric signal by demodulating the fourth sub light beam. The spectrum detection system can eliminate environmental noise through the third electric signal and the first electric signal, so that the accuracy of detecting the detected substance is improved. Similarly, the spectral detection system can eliminate the environmental noise by the fourth electrical signal and the second electrical signal, thereby improving the accuracy of detecting the detected substance. In addition, in the application, the first light beam to be detected, the second sub light beam, the second light beam to be detected and the fourth sub light beam share one detector, so that the number of detectors can be reduced, and the cost of the spectrum detection system can be reduced.
In an alternative form of the first aspect, the detector is arranged to receive the light beam in the following order: the second sub-beam, the first beam to be detected, the fourth sub-beam and the second beam to be detected. Where the interval between different beams is 0, assuming that the duration of each beam is t. In the present application, after 2t, the spectrum detection system may attempt to obtain the detection result of the detected substance according to the second sub-beam and the first light beam to be detected. In another possible solution, the detector receives the light beam in the following order: the second sub-beam, the fourth sub-beam, the first beam to be detected and the second beam to be detected. At this time, after 3t, the spectrum detection system can try to obtain the detection result of the detected substance. Therefore, the detection efficiency can be improved.
In an alternative form of the first aspect, the system further comprises a processor. The light source module is also for generating a target light beam. The detector is used for receiving the first light beam to be detected, the target light beam and the second light beam to be detected in a time-sharing mode, and a fifth electric signal is obtained by demodulating the target light beam. The processor is used for obtaining a first detection result of the detected substance according to the fifth electric signal and the first electric signal. The processor is further configured to obtain a second detection result of the substance to be detected based on the fifth electrical signal and the second electrical signal. The target beam is used as a reference beam of the first to-be-detected beam and the second to-be-detected beam. By sharing the reference beams, the number of the reference beams can be reduced on the basis of eliminating environmental noise, so that the cost of the light source assembly is reduced.
In a second aspect, the present application provides a method of spectral detection. The spectrum detection method comprises the following steps: a first probe beam and a second probe beam are generated by the light source assembly. The transmission path of the first probe beam and the transmission path of the second probe beam are different. The first probe beam is irradiated to the detected substance to generate a first beam to be detected. The second probe beam irradiates the detected substance to generate a second beam to be detected. And receiving the first light beam to be detected and the second light beam to be detected in a time-sharing manner by a detector. The first light beam to be detected is demodulated through the detector to obtain a first electric signal, and the second light beam to be detected is demodulated through the detector to obtain a second electric signal.
In an alternative form of the second aspect, the detectable substance comprises a first detectable substance and a second detectable substance. The first probe beam irradiates the first detected substance to generate a first detection beam. The second probe beam is irradiated to the second detected substance to generate a second detection beam.
In an alternative form of the second aspect, the method of spectroscopic detection further comprises; the first beam to be detected is transmitted through a first optical fiber. And transmitting the second light beam to be detected through a second optical fiber. The first light beam to be detected and the second light beam to be detected are received through two input ports of the beam combiner in a time-sharing mode, and the first light beam to be detected and the second light beam to be detected are output to the detector.
In an alternative form of the second aspect, the method of spectroscopic detection further comprises: and receiving the first light beam to be detected and the second light beam to be detected from the beam combiner through the target optical fiber in a time-sharing manner, and outputting the first light beam to be detected and the second light beam to be detected to the detector.
In an alternative form of the second aspect, the first optical fiber is a multimode optical fiber.
In an alternative form of the second aspect, the target optical fibre is a multimode optical fibre.
In an alternative form of the second aspect, the method of spectral detection further includes: and outputting a first light beam to be detected to the first optical fiber through the integrating sphere.
In an alternative form of the second aspect, the first probe beam and the second probe beam are generated time-divisionally by the light source assembly.
In an alternative form of the second aspect, the method of spectral detection further includes: the first light beam to be detected is blocked in a time-sharing mode through the first optical switch, and the second light beam to be detected is blocked in a time-sharing mode through the second optical switch.
In an alternative form of the second aspect, the time interval between the first and second beams to be detected is greater than 10 milliseconds.
In an alternative form of the second aspect, the method of spectral detection further includes: the first probe beam is received by the first beam splitter to obtain a first sub-beam and a second sub-beam. The first sub-beam irradiates the detected substance to generate a first beam to be detected. And receiving the second detection beam through the second beam splitter to obtain a third sub-beam and a fourth sub-beam. The third sub-beam irradiates the detected substance to generate a second beam to be detected. And receiving the first light beam to be detected, the second sub-light beam, the second light beam to be detected and the fourth sub-light beam in a time-sharing manner through the detector. And demodulating the second sub-beam by a detector to obtain a third electric signal, and demodulating the fourth sub-beam by the detector to obtain a fourth electric signal.
In an alternative form of the second aspect, the detector receives the light beams in the following order: the second sub-beam, the first beam to be detected, the fourth sub-beam and the second beam to be detected.
In an alternative form of the second aspect, the method of spectroscopic detection further comprises: a target beam is generated by the light source assembly. And receiving the first light beam to be detected, the target light beam and the second light beam to be detected in a time-sharing manner through the detector. And demodulating the target light beam by the detector to obtain a fifth electric signal. And obtaining a first detection result of the detected substance according to the fifth electric signal and the first electric signal. And obtaining a second detection result of the detected substance according to the fifth electric signal and the second electric signal.
A third aspect of the present application provides a computer storage medium, wherein instructions are stored in the computer storage medium, and when executed on a computer, the instructions cause the computer to perform the method according to the second aspect or any one of the embodiments of the second aspect.
A fourth aspect of the present application provides a computer program product, wherein the computer program product, when executed on a computer, causes the computer to perform the method according to any one of the embodiments of the second aspect or the second aspect.
Drawings
FIG. 1 is a schematic diagram of a spectral detection system;
FIG. 2 is a schematic diagram of a first configuration of a spectroscopic detection system provided herein;
FIG. 3 is a schematic diagram of a second configuration of a spectral detection system provided herein;
FIG. 4 is a timing diagram of the time-sharing control of the light sources provided in the present application;
FIG. 5 is a schematic diagram of a third configuration of a spectral detection system provided herein;
FIG. 6 is a timing diagram of an optical switch provided herein;
FIG. 7 is a schematic flow chart of a spectral detection method provided herein;
FIG. 8 is a first timing diagram of the reception of a beam by a detector as provided herein;
FIG. 9 is a second timing diagram of the reception of a beam by a detector as provided in the present application;
FIG. 10 is a timing diagram of the substances being detected on the conveyor belt as provided in the present application;
FIG. 11 is a fourth schematic diagram of a spectral detection system provided herein;
FIG. 12 is a third timing diagram of the reception of a beam by a detector as provided herein;
FIG. 13 is a schematic diagram of a fifth configuration of a spectral detection system provided herein;
FIG. 14 is a fourth timing diagram of a detector provided in the present application receiving a light beam.
Detailed Description
The present application provides a spectroscopic detection system and method. In the application, two light beams to be detected share one detector, so that the number of the detectors can be reduced, and the cost of the spectrum detection system is reduced. It is to be understood that the use of "first," "second," etc. throughout this application is for purposes of distinguishing between descriptions and is not intended to indicate or imply relative importance, nor is the order in which such indications or indications are intended to be construed. In addition, reference numerals and/or letters are repeated among the various figures of the present application for sake of brevity and clarity. Repetition does not indicate a strict, restrictive relationship between the various embodiments and/or configurations.
The spectral detection system and method provided in the present application can be applied to the field of detection technology. In the field of detection technology, the chemical composition and relative content of the substance to be detected can be determined by spectroscopic analysis. After the detection light beam irradiates the detected substance, the detection light beam is reflected or transmitted to generate a light beam to be detected. When the spectrum detection system comprises a plurality of light beams to be detected, each light beam to be detected in the plurality of light beams to be detected needs to correspond to one detector. For example, fig. 1 is a schematic diagram of a structure of a spectrum detection system. As shown in FIG. 1, the spectral detection system includes a light source assembly 101, a detector 104, and a detector 105. The light source assembly 101 is configured to generate a first probe beam and a second probe beam. The first probe beam is irradiated onto the detected substance 102 to generate a first detection beam. The second probe beam is irradiated onto the detected substance 103 to generate a second detection beam. The detector 104 is configured to receive the first light beam to be detected, and demodulate the first light beam to be detected to obtain a first electrical signal. The detector 105 is configured to receive the second light beam to be detected, and demodulate the second light beam to be detected to obtain a second electrical signal. In this case, the spectral detection system comprises two light beams to be detected. The two beams of light beams to be detected are respectively a first beam to be detected and a second beam to be detected. The first beam to be detected corresponds to the detector 104 and the second beam to be detected corresponds to the detector 105.
Wherein the price of the detector is relatively expensive. For example, the main material of the detector for Near-infrared (Near-infrared) band may be Gallium Arsenide (InGaAs). InGaAs is expensive. When the number of the light beams to be detected in the spectrum detection system is large, the spectrum detection system needs more detectors, so that the overall cost of the spectrum detection system is high.
To this end, the present application provides a spectroscopic detection system. In a spectral detection system, two light beams to be detected share a detector. Specifically, fig. 2 is a first structural schematic diagram of the spectrum detection system provided in the present application. As shown in FIG. 2, the spectral detection system includes a light source module 201 and a detector 203. The spectroscopic detection system is used to detect the chemical composition and relative content of the substance 2021 being detected. The detection target substance 202 includes a detection target substance 2021 and a detection target substance 2022. The light source assembly 201 is configured to generate a first probe beam and a second probe beam. The first probe beam is irradiated onto the detected substance 2021 (also referred to as a first detected substance) to generate a first detection beam. The second probe beam is irradiated onto the detected substance 2022 (also referred to as a second detected substance) to generate a second detection beam. The detector 203 is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing manner. The detector 203 is further configured to demodulate the first light beam to be detected to obtain a first electrical signal, and demodulate the second light beam to be detected to obtain a second electrical signal. In the present application, the detector 203 receives the first and second beams to be detected in a time-sharing manner, i.e. the two beams to be detected share one detector. Therefore, the number of detectors can be reduced, and the cost of the spectrum detection system is reduced. For example, the spectral detection system of FIG. 1 includes two detectors and the spectral detection system of FIG. 2 includes one detector.
It should be understood that, in fig. 2, the transmission paths of the first probe beam at different times are the same without changing the transmission path of the first probe beam. At this time, the detector 203 receives the first light beam to be detected at different times in a time-sharing manner. To distinguish from this scheme, the present application defines the transmission paths of the first probe beam and the second probe beam to be different. The detector 203 receives the first and second detection beams in a time-sharing manner.
In other embodiments, the spectral detection system further comprises a processor. The processor may perform different processing on the electrical signals obtained by the detector 203 as desired. For example, after the detector 203 obtains the first electrical signal and the second electrical signal, the processor is configured to obtain a first spectrum according to the first electrical signal and obtain a second spectrum according to the second electrical signal. For example, a spectral model is stored in the processor. After the detector 203 obtains the first electrical signal, the processor inputs the first electrical signal into the spectral model, and outputs a first detection result. The first detection result is used for indicating the analysis result of the spectrum detection system on the first substance to be detected. In the following embodiments, the first detection result will be exemplified. Similarly, after the detector 203 obtains the second electrical signal, the processor inputs the second electrical signal into the spectral model, and outputs a second detection result.
The light source module 201 may include one or two light sources. When the light source module 201 includes one light source, the spectrum detection system in fig. 2 is in a shared light source mode. In the shared light source mode, the spectral detection system further includes a light splitting module. The light splitting module can be a beam splitter, a light splitting prism and the like. After the light source generates the detection light beam, the light splitting module splits the detection light beam into a first detection light beam and a second detection light beam. When the light source module 201 includes two light sources, the spectrum detecting system in fig. 2 is in a stand-alone light source mode. In the independent light source mode, two light sources correspond to two detection light beams one to one. Specifically, the two light sources include a first light source and a second light source. The first light source is configured to generate a first probe beam and the second light source is configured to generate a second probe beam.
The present application does not limit the structure of the light source assembly 201. For example, in practical applications, the light source module 201 may further include an objective lens module, a grating, and the like. Wherein, when the objective lens module comprises a convex lens, the objective lens module can focus the detection light beam. When the objective lens module includes a mirror, the objective lens module may change a transmission path of the probe beam. The grating is used for selecting the wavelength of the detection light beam and changing the wavelength range of the detection light beam.
It should be understood that in fig. 2, the first detection beam is obtained by reflecting the first probe beam. In practical applications, the first light beam to be detected may be obtained by transmitting the first probe light beam.
It is to be understood that, in fig. 2, the substance to be detected 2021 and the substance to be detected 2022 belong to different individuals. In practical applications, the substance to be detected 2021 and the substance to be detected 2022 may belong to the same individual. For example, when the first probe beam and the second probe beam are irradiated to the same ore, the detected substance 2021 and the detected substance 2022 are the same ore.
It should be understood that in fig. 2, the spectral detection system includes two light beams to be detected. In practical applications, the spectrum detection system may further include more light beams to be detected. For example, on the basis of fig. 2, the light source assembly 201 is also used for generating a third probe beam. The third probe beam is irradiated onto the substance to be detected 2022 to generate a third beam to be detected. The detector 203 is configured to receive the first to-be-detected light beam, the second to-be-detected light beam, and the third to-be-detected light beam in a time-sharing manner. The detector 203 is further configured to demodulate the third detected light beam to obtain a third electrical signal.
In the spectral detection system of the present application, a plurality of light beams to be detected share a single detector. In this case, a plurality of light beams to be detected need to reach the same detector. In practical application, it is difficult to design a spectrum detection system so that a detection light beam is directly reflected or transmitted to the same detector after being irradiated to a detected substance. To this end, the spectral detection system of the present application further comprises an optical fiber. The optical fiber is used for transmitting the light beam to be detected. Specifically, fig. 3 is a schematic diagram of a second structure of the spectrum detection system provided in the present application. As shown in fig. 3, the spectrum detection system includes an integrating sphere 301, an integrating sphere 302, an optical fiber 303 (also referred to as a first optical fiber), an optical fiber 304 (also referred to as a second optical fiber), a beam combiner 305, an optical fiber 306 (also referred to as a target optical fiber), and a processor 307.
The integrating sphere 301 is used for collecting the first light beam to be detected, and reduces the loss of the first light beam to be detected. The output of integrating sphere 301 is connected to optical fiber 303. The output of the fiber 303 is connected to a combiner 305. The optical fiber 303 is used for transmitting the first light beam to be detected and outputting the first light beam to be detected to the beam combiner 305. Similarly, the integrating sphere 303 is used for collecting the second light beam to be detected, so that the loss of the second light beam to be detected is reduced. The output of integrating sphere 302 is connected to optical fiber 304. The output end of the optical fiber 304 is connected to a combiner 305. The optical fiber 304 is used for transmitting the second light beam to be detected and outputting the second light beam to be detected to the beam combiner 305.
Two input ports of the combiner 305 are connected to the optical fibers 303 and 304, respectively. The output port of the combiner 305 is connected to an optical fiber 306. The beam combiner 305 is configured to receive the first to-be-detected light beam and the second to-be-detected light beam in a time-sharing manner through the two input ports, and output the first to-be-detected light beam and the second to-be-detected light beam to the optical fiber 306 in a time-sharing manner. The input port of the fiber 306 is connected to the combiner 305. The output port of the fiber 306 is connected to the detector 203. The optical fiber 306 is used for receiving the first to-be-detected light beam and the second to-be-detected light beam from the beam combiner 305 in a time-sharing manner, and outputting the first to-be-detected light beam and the second to-be-detected light beam to the detector 203. The detector 203 is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing manner. The detector 203 is further configured to demodulate the first light beam to be detected to obtain a first electrical signal, and demodulate the second light beam to be detected to obtain a second electrical signal. The processor 307 processes the first electrical signal and the second electrical signal accordingly according to requirements. Reference may be made in particular to the preceding description of the processor.
In other embodiments, optical fiber 303 and/or optical fiber 306 are multimode optical fibers. The sensitive wavelength bands of different detected substances are different, that is, the wavelength ranges of the first to-be-detected light beams are different for different detected substances. Multimode fibers can transmit a greater range of wavelengths, thereby increasing the species that can be detected. In particular, when the substance to be detected 2021 and the substance to be detected 2022 are not present, the wavelength ranges of the first light beam to be detected and the second light beam to be detected may be different. In this case, optical fiber 306 needs to transmit both the first and second detection beams. Therefore, when the optical fiber 306 is a multimode optical fiber, the substance to be detected 2021 and the substance to be detected 2022 may be different substances, thereby improving the detection capability of the spectrum detection system.
In other embodiments, the first probe beam and the second probe beam have the same wavelength range. In industrial processes, it is often necessary to use a spectroscopic detection system to detect the same substance on multiple channels, for example apples on multiple conveyor belts. In this case, the substance to be detected 2021 and the substance to be detected 2022 are the same substance, and the substance to be detected 2021 and the substance to be detected 2022 have the same sensitivity wavelength band. The spectrum detection system adopts the detection light beams with the same wavelength range to detect the detected substances.
It should be understood that fig. 3 is one example of a spectral detection system provided herein. In practical applications, those skilled in the art can adapt the modifications according to actual needs. After adaptive modification, if a plurality of light beams to be detected of the spectrum detection system share one detector, the scope of the present application should be still covered. Adaptive modifications include, but are not limited to, any of the following.
For example, in FIG. 2, the detector 203 includes a receiving port. In practical applications, the detector 203 comprises two receiving ports. The two receiving ports are connected to optical fibers 303 and 304, respectively. At this point, the spectral detection system may not include a beam splitter and optical fiber 306.
For example, in fig. 2, the spectral detection system includes two light beams to be detected. In practical applications, the spectral detection system may include a greater number of light beams to be detected. For example, on the basis of fig. 3, the spectral detection system further includes a third substance to be detected and a third optical fiber. The light source module 201 is also used to generate a third probe beam. The third detection beam irradiates on the third detected substance to generate a third beam to be detected. The third light beam to be detected reaches the beam combiner 305 after passing through the third optical fiber. The combiner 305 includes three input ports. The beam combiner 305 is configured to receive the first to-be-detected light beam, the second to-be-detected light beam, and the third to-be-detected light beam in a time-sharing manner through the three input ports. The detector 203 is configured to receive the first to-be-detected light beam, the second to-be-detected light beam, and the third to-be-detected light beam from the optical fiber 306 in a time-sharing manner. The detector 203 is further configured to demodulate the third detected light beam to obtain a third electrical signal.
In the spectrum detection system of the present application, the detector 203 is configured to receive a plurality of light beams to be detected in a time-sharing manner. Therefore, the spectrum detection system can perform time-sharing control on the light beams to be detected. The time-sharing control comprises light source time-sharing control and/or blocking time-sharing control. Which are described separately below.
First, in the light source time-sharing control, the light source module is configured to generate the first probe beam and the second probe beam in time-sharing. For example, fig. 4 is a timing diagram of the time-sharing control of the light source provided in the present application. As shown in fig. 4, between time t0 and time t1, the light source assembly generates a first probe beam. Between time t2 and time t3, the light source assembly generates a second probe beam. Similarly, the cycle is repeated.
there is a time interval between time t1 and time t 2. the time interval between times t1 and t2 is also referred to as the time interval between the first probe beam and the second probe beam. Since the first probe beam is used to generate the first beam to be detected and the second probe beam is used to generate the second beam to be detected, the time interval between the time t1 and the time t2 is also referred to as the time interval between the first beam to be detected and the second beam to be detected. In other embodiments, the time interval between the first and second beams to be detected is greater than 10 milliseconds.
Secondly, in the blocking time-sharing control, the spectrum detection system further comprises an optical switch. The optical switch is used for blocking the first light beam to be detected and the second light beam to be detected in a time-sharing mode. For example, fig. 5 is a third schematic diagram of a spectral detection system provided in the present application. As shown in fig. 5, on the basis of fig. 3, the spectrum detection system further includes an optical switch 503 (also referred to as a first optical switch) and an optical switch 504 (also referred to as a second optical switch). The optical switch 503 is on the transmission path of the first light beam to be detected. The optical switch 504 is in the transmission path of the second beam to be detected. The optical switch 503 is used to time-divisionally block the first light beam to be detected. The optical switch 504 is used for time-sharing blocking the second light beam to be detected. For example, fig. 6 is a timing diagram of an optical switch provided in the present application. As shown in fig. 6, the optical switch 503 is turned on between time t0 and time t1, and the first light beam to be detected normally passes through. The optical switch 503 is blocked between the time t1 and the time t3, and the first light beam to be detected cannot pass through. Similarly, the optical switch 504 is blocked between the time t0 and the time t2, and the second light beam to be detected cannot pass through. The optical switch 503 is turned on between the time t2 and the time t3, and the second light beam to be detected normally passes through.
It should be understood that the above two time-sharing controls are not contradictory. Therefore, in practical applications, the spectrum detection system may choose to adopt one or two of the time-sharing controls.
The two time-sharing controls in the present application are described above, and the spectrum detection method in the present application is described below with reference to the timing chart in fig. 6 by taking the spectrum detection system shown in fig. 5 as an example. Fig. 7 is a schematic flow chart of a spectral detection method provided in the present application. As shown in fig. 7, the spectrum detection method includes the following steps.
In step 701, a first probe beam and a second probe beam are generated by a light source assembly.
As shown in fig. 5, a substance to be detected 2021 is located on the conveyor belt 501, and a substance to be detected 2022 is located on the conveyor belt 502. The conveying directions of the conveyor 501 and the conveyor 502 are shown by arrows in the figure. On the conveyor belt 501, the substance to be detected 2021 continuously passes through. On the conveyor belt 502, the substance to be detected 2022 continuously passes through. The spectral detection system needs to detect the detected substances on the two conveyor belts through spectral analysis. The substance to be detected can be fruit, beverage, electronic product, etc. The light source assembly 201 continuously generates a first probe beam and a second probe beam.
In step 702, a first probe beam is irradiated to the substance to be detected to generate a first beam to be detected, and a second probe beam is irradiated to the substance to be detected to generate a second beam to be detected. The position to be detected by the first probe beam is referred to as a first detection point, which is located on the conveyor belt 501. The location where the second probe beam is required to be detected is referred to as a second detection point, which is located on the conveyor belt 502.
As shown in fig. 6, the first detection point continues to have the substance to be detected 2021 present between time t0 and time t 1. The first probe beam continuously irradiates the detected substance 2021, and continuously generates a first beam to be detected. The integrating sphere 301 collects the first light beam to be detected and transmits the first light beam to the beam combiner 305 through the optical fiber 303. The beam combiner 305 transmits the first beam to be detected to the detector 203 through the optical fiber 306. The second detection point does not have the substance to be detected 2022 between the time t0 and the time t 1. The second detection beam continuously irradiates the second detection point, and the second beam to be detected is not generated.
Between the time t1 and the time t2, if the detected substance 2021 does not exist in the first detection point, the first detection beam continuously irradiates the first detection point, and the first detection beam to be detected is not generated. The second detection point does not have the detected substance 2022 between the time t1 and the time t 2. The second detection beam continuously irradiates the second detection point, and the second beam to be detected is not generated.
It is understood that between time t0 and time t2, even if the detected substance 2022 is present at the second detection point, the optical switch 504 blocks the second detection beam generated by the second detection beam when the second detection beam passes through the optical switch 504. At this time, the beam combiner 305 cannot receive the second detection beam.
Between the time t2 and the time t3, the substance to be detected 2021 does not exist at the first detection point. The first probe beam is continuously irradiated to the detected substance 2021 without generating the first detection beam. The second detection point continues to have the substance to be detected 2022 present between time t2 and time t 3. And the second detection beam continuously irradiates the second detection point to generate a second beam to be detected. Integrating sphere 302 collects the second light beam to be detected and transmits the second light beam to combiner 305 through optical fiber 304. The beam combiner 305 transmits the second beam to be detected to the detector 203 through the optical fiber 306.
It is to be understood that between time t1 and time t3, even if the detected substance 2021 is present at the first detection point, the optical switch 503 blocks the second detection beam when the first detection beam generated by the first detection beam passes through the optical switch 503. At this time, the beam combiner 305 cannot receive the first beam to be detected.
In step 703, the first and second beams to be detected are received by the detector in a time-sharing manner.
As can be seen from the foregoing description in step 702, the beam combiner 305 may receive the first light beam to be detected between time t0 and time t 1. FIG. 8 is a first timing diagram of a detector provided in the present application receiving a light beam. At this time, as shown in fig. 8, the detector 203 receives the first light beam to be detected between the time t0 and the time t 1. It should be understood that the present application ignores the time that the light beam spends in the transmission path for convenience of description. Between time t1 and time t2, the beam combiner 305 cannot receive the light beam to be detected. At this time, as shown in fig. 8, the detector 203 does not receive the light beam to be detected between the time t1 and the time t 2. Between time t2 and time t3, the beam combiner 305 may receive the second light beam to be detected. At this time, as shown in fig. 8, the detector 203 receives the second light beam to be detected between time t2 and time t 3. Therefore, the detector in the present application receives the first and second beams to be detected in a time-sharing manner.
It should be understood that in fig. 8, time t1 is less than time t 2. There is an interval between time t1 and time t2, during which the detector 203 does not receive the light beam to be detected. In practical applications, time t1 may be greater than time t 2. Specifically, FIG. 9 is a second timing diagram of the reception of a light beam by a detector as provided herein. As shown in fig. 9, the detector 203 receives the first light beam to be detected between time t0 and time t 1. The detector 203 receives the second light beam to be detected between time t2 and time t 3. The detector 203 receives the first and second beams to be detected between time t2 and time t 1. At this time, in fig. 9, the detector 203 receives the first to-be-detected light beam and the second to-be-detected light beam in time division. After the detector 203 obtains the electrical signal from the light beam to be detected, the processor may discard the electrical signal between time t2 and time t 1.
It will be appreciated that in fig. 8 and 9, the detector 203 periodically receives the first and second beams to be detected. In practical applications, the detector 203 may receive the first to-be-detected light beam and the second to-be-detected light beam non-periodically. For example, in fig. 8, the detector 203 receives the first light beam to be detected between time t4 and time t 5. In practical applications, the first detection point is free from the detected substance between the time t4 and the time t 5. The first probe beam does not generate the first detection beam. At this time, the detector 203 does not receive the first light beam to be detected between the time t4 and the time t 5. Thereafter, the detector 203 receives the second light beam to be detected between time t6 and time t 7.
In step 704, the first light beam to be detected is demodulated by the detector to obtain a first electrical signal, and the second light beam to be detected is demodulated by the detector to obtain a second electrical signal.
The processor 307 has a spectral model stored therein. After the detector 203 obtains the first electrical signal, the processor 307 inputs the first electrical signal into the spectral model, and outputs a first detection result. The first detection result is used for indicating the analysis result of the spectral detection system on the first substance to be detected. For example, the first detection result may be a composition table of the detected substance 2021. Alternatively, the first test result is pass or fail. For example, the first detectable substance 2021 is an apple. After the processor 307 determines the components of the apple by the spectral model, it determines that abnormal components exist in the apple. The abnormal component is pesticide residue. The first detection result output by the processor 307 is a fail. Similarly, after the detector 203 obtains the second electrical signal, the processor inputs the second electrical signal into the spectral model, and outputs a second detection result.
As can be seen from the foregoing descriptions of fig. 4 and 6, the spectrum detection system in the present application can perform time-sharing control on the light beams to be detected. It should be understood that in practical applications, the spectrum detection system may also control the timing of the detected substances to achieve time-sharing control. For example, in fig. 5, the processor is also used to generate the control signal. The control signal is used to control the control mechanism. The control mechanism can be a cylinder or a motor on the conveyor belt. The control mechanism can move the baffle to control whether the detected substance normally passes through the conveyor belt. Thus, the control mechanism can control the position of the detected substance on the conveyor belt and thus control when the detected substance is present at the first detection point. Specifically, fig. 10 is a timing diagram of the substances being detected on the conveyor belt as provided in the present application. As shown in fig. 10, the first detection point has a substance to be detected 2021 between time t0 and time t 1. At this time, the first probe beam is irradiated onto the detected substance 2021, generating a first detection beam. The first detection point has no substance to be detected 2021 between time t1 and time t 3. At this time, the first probe beam is not irradiated onto the detected substance 2021, and the first detection beam is not generated. Similarly, the second detection point is free from the substance to be detected 2022 between the time t0 and the time t 2. At this time, the second probe beam is not irradiated onto the detected substance 2022, and the second detection beam is not generated. The second detection point has the substance to be detected 2022 between time t2 and time t 3. At this time, the second probe beam is irradiated onto the substance to be detected 2022, and a second beam to be detected is generated. Therefore, time-sharing control can be realized by the control means.
It should be appreciated that in the present application, the optical switch 503 can reduce the effect of interfering light beams. For example, if the detection target substance 2021 is not present at the first detection point between the time t1 and the time t2, the first detection beam is continuously irradiated to the first detection point. If the first probe beam passes the first probe point and impinges on another substance, such as a conveyor belt, an interference beam is generated. Alternatively, in the context of the application of the spectral detection system, there may be other interfering light beams, such as illumination light. Integrating sphere 301 can also generate the light beam to be detected by collecting the interfering light beam. However, due to the presence of the optical switch 503, the optical switch 503 blocks the light beam to be detected, thereby reducing the influence of the interfering light beam.
The spectral detection method in the present application is described above. As can be seen from the foregoing description, the optical switch 503 can reduce the influence of the interfering light beam. The disturbing light beam may also be understood as ambient noise. The spectral detection system provided in the present application is described below. On the basis of reducing environmental noise, a plurality of light beams to be detected and sub-light beams of a spectrum detection system share one detector. Specifically, fig. 11 is a fourth structural diagram of the spectrum detection system provided in the present application.
As shown in fig. 11, based on fig. 5, the spectrum detection system further includes a beam splitter 1101 (also referred to as a first beam splitter), a beam splitter 1102 (also referred to as a second beam splitter), an optical fiber 1103, and an optical fiber 1104. Therein, the beam splitter 1101 is configured to receive the first probe beam, and obtain a first sub-beam and a second sub-beam. The first sub-beam is irradiated to the detected substance 2021 to generate a first beam to be detected. The beam splitter 1102 is configured to receive the second probe beam, and obtain a third sub-beam and a fourth sub-beam. The third sub-beam is irradiated to the substance to be detected 2022, generating a second beam to be detected. For the description of the first and second beams to be detected, refer to the description of fig. 3. The optical fiber 1103 is used for transmitting the second sub-beam to the beam combiner 305. The optical fiber 1104 is used for transmitting the fourth sub-beam to the beam combiner 305. The beam combiner 305 is configured to receive the first to-be-detected light beam, the second sub-light beam, the second to-be-detected light beam, and the fourth sub-light beam in a time-sharing manner. The detector 203 is used for receiving the first to-be-detected beam, the second sub-beam, the second to-be-detected beam and the fourth sub-beam from the beam combiner 305 in a time-sharing manner. The detector 203 is further configured to demodulate the second sub-beam to obtain a third electrical signal, and demodulate the fourth sub-beam to obtain a fourth electrical signal.
The processor 307 is configured to process the third electrical signal and the first electrical signal to eliminate the environmental noise. Specifically, the second sub-beam and the first light beam to be detected carry similar environmental noise. The electrical signals obtained by the second sub-beam and the first light beam to be detected may also carry similar environmental noise. By the algorithm processing, the ambient noise can be eliminated. For example, the third electric signal and the first electric signal are subtracted from each other, and the subtracted difference and the original electric signal that generates the first probe beam are added to obtain the spectrum of the detected substance 2021. Similarly, the processor 307 is further configured to process the fourth electrical signal and the second electrical signal to remove the environmental noise. By eliminating environmental noise, the accuracy of spectral detection can be improved. In addition, the first light beam to be detected, the second sub-light beam, the second light beam to be detected and the fourth sub-light beam share one detector, so that the number of the detectors can be reduced, and the cost of the spectrum detection system can be reduced.
In other embodiments, the detector 203 is configured to receive the light beam in the following order: the second sub-beam, the first beam to be detected, the fourth sub-beam and the second beam to be detected. For example, FIG. 12 is a third timing diagram of the reception of a beam by a detector as provided herein. As shown in fig. 12, the detector 203 receives the second sub-beam between time t0 and time t 1. The detector 203 receives the first light beam to be detected between time t2 and time t 3. The detector 203 receives the fourth sub-beam between time t4 and time t 5. The detector 203 receives the second light beam to be detected between time t6 and time t 7. At this time, after t3, the spectrum detecting system may try to obtain the detection result of the substance 2021 to be detected.
In fig. 11, the second sub-beam is the reference beam of the first detection beam, and the fourth sub-beam is the reference beam of the second detection beam. In other embodiments, the spectral detection system may share the reference beam when the wavelength ranges of the first and second to be detected beams are the same. For example, fig. 13 is a schematic diagram of a fifth structure of the spectrum detection system provided in the present application. As shown in fig. 13, on the basis of fig. 5, the spectrum detection system further includes an optical fiber 1303. The light source module 201 is also used to generate a target light beam. The optical fiber 1303 is used for transmitting the target beam to the beam combiner 305. The beam combiner 305 is configured to receive the first to-be-detected light beam, the target light beam, and the second to-be-detected light beam in a time-sharing manner. The detector 203 is used for receiving the first detected light beam, the target light beam and the second detected light beam from the beam combiner 305 in a time-sharing manner. For example, fig. 14 is a fourth timing diagram of the reception of a light beam by a detector provided in the present application. As shown in fig. 14, the detector 203 receives the fourth probe beam between time t0 and time t 1. The detector 203 receives the first light beam to be detected between time t2 and time t 3. The detector 203 receives the second light beam to be detected between time t4 and time t 5.
The detector 203 is also used to demodulate the object beam to obtain a fifth electrical signal. The processor 307 is configured to eliminate the environmental noise according to the target light beam and the first electric signal, and obtain a first detection result of the detected substance 2021. The processor 307 is configured to eliminate the environmental noise according to the fifth electrical signal and the second electrical signal, and obtain a second detection result of the detected substance 2022. At this time, the fourth detection beam serves as a reference beam for the first detection beam and the second detection beam. The spectral detection systems share a reference beam.
In other embodiments, the fourth probe beam may be the second sub-beam of FIG. 11, as previously described. At this point, the spectral detection system further includes a first beam splitter. The first beam splitter is used for obtaining a first sub-beam and a second sub-beam according to the first detection beam. The first sub-beam is irradiated to the detected substance 2021 to generate a first beam to be detected. The detector 203 is used for demodulating the second sub-beam to obtain a fifth electrical signal.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application.
Claims (22)
1. A spectroscopic detection system, comprising:
a light source assembly and a detector;
the light source assembly is used for generating a first detection light beam and a second detection light beam, and the transmission path of the first detection light beam is different from that of the second detection light beam;
the first detection light beam irradiates a detected substance to generate a first light beam to be detected, and the second detection light beam irradiates the detected substance to generate a second light beam to be detected;
the detector is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing mode, obtaining a first electric signal by demodulating the first light beam to be detected, and obtaining a second electric signal by demodulating the second light beam to be detected.
2. The system of claim 1, wherein the detected substance comprises a first detected substance and a second detected substance;
the first detection light beam irradiates the first detected substance to generate a first light beam to be detected;
and the second detection beam irradiates the second detected substance to generate a second light beam to be detected.
3. The system of claim 1 or 2, further comprising a first optical fiber, a second optical fiber, and a combiner;
the first optical fiber is used for transmitting the first light beam to be detected, and the second optical fiber is used for transmitting the second light beam to be detected;
two input ports of the beam combiner are respectively connected with the first optical fiber and the second optical fiber;
the beam combiner is used for receiving the first light beam to be detected and the second light beam to be detected in a time-sharing mode through the two input ports and outputting the first light beam to be detected and the second light beam to be detected to the detector.
4. The system of claim 3, further comprising a target fiber, an input port of the target fiber being connected to an output port of the combiner;
the target optical fiber is used for receiving the first light beam to be detected and the second light beam to be detected from the beam combiner in a time-sharing manner and outputting the first light beam to be detected and the second light beam to be detected to the detector.
5. The system of claim 3 or 4, wherein the first optical fiber is a multimode optical fiber.
6. The system of any one of claims 3 to 5, further comprising an integrating sphere, the integrating sphere being connected to the input end of the first optical fiber.
7. The system of any one of claims 1 to 6, wherein the light source assembly is configured to generate the first probe beam and the second probe beam in a time-shared manner.
8. The system according to any one of claims 1 to 7, further comprising a first optical switch in a transmission path of the first light beam to be detected and a second optical switch in a transmission path of the second light beam to be detected;
the first optical switch is used for blocking the first light beam to be detected in a time-sharing manner, and the second optical switch is used for blocking the second light beam to be detected in a time-sharing manner.
9. The system of any one of claims 1 to 8, further comprising a first beam splitter and a second beam splitter;
the first beam splitter is used for receiving the first detection beam to obtain a first sub beam and a second sub beam, and the first sub beam irradiates the detected substance to generate a first beam to be detected;
the second beam splitter is used for receiving the second detection beam to obtain a third sub-beam and a fourth sub-beam, and the third sub-beam irradiates the detected substance to generate a second beam to be detected;
the detector is used for receiving the first light beam to be detected, the second sub light beam, the second light beam to be detected and the fourth sub light beam in a time-sharing manner, obtaining a third electric signal by demodulating the second sub light beam, and obtaining a fourth electric signal by demodulating the fourth sub light beam.
10. The system of claim 9, wherein the detector is configured to receive the light beam in the following order: the second sub-beam, the first beam to be detected, the fourth sub-beam and the second beam to be detected.
11. The system of any one of claims 1 to 8, further comprising a processor;
the light source assembly is further configured to generate a target light beam;
the detector is used for receiving the first light beam to be detected, the target light beam and the second light beam to be detected in a time-sharing manner, and a fifth electric signal is obtained by demodulating the target light beam;
the processor is used for obtaining a first detection result of the detected substance according to the fifth electric signal and the first electric signal;
the processor is further configured to obtain a second detection result of the detected substance according to the fifth electrical signal and the second electrical signal.
12. A method of spectral detection, comprising:
generating, by a light source assembly, a first probe light beam and a second probe light beam, the first probe light beam and the second probe light beam having different transmission paths;
the first detection light beam irradiates a detected substance to generate a first light beam to be detected, and the second detection light beam irradiates the detected substance to generate a second light beam to be detected;
the first light beam to be detected and the second light beam to be detected are received through the detector in a time-sharing mode, the first light beam to be detected is demodulated through the detector to obtain a first electric signal, and the second light beam to be detected is demodulated through the detector to obtain a second electric signal.
13. The method of claim 12, wherein the detected substance comprises a first detected substance and a second detected substance;
the first detection light beam irradiates the first detected substance to generate a first light beam to be detected;
and the second detection beam irradiates the second detected substance to generate a second beam to be detected.
14. The method of claim 12 or 13, further comprising;
transmitting the first light beam to be detected through a first optical fiber;
transmitting the second light beam to be detected through a second optical fiber;
and receiving the first light beam to be detected and the second light beam to be detected in a time-sharing manner through two input ports of the beam combiner, and outputting the first light beam to be detected and the second light beam to be detected to the detector.
15. The method of claim 14, further comprising:
and receiving the first light beam to be detected and the second light beam to be detected from the beam combiner through a target optical fiber in a time-sharing manner, and outputting the first light beam to be detected and the second light beam to be detected to the detector.
16. The method of claim 14 or 15, wherein the first optical fiber is a multimode optical fiber.
17. The method according to any one of claims 14 to 16, further comprising:
and outputting the first light beam to be detected to the first optical fiber through an integrating sphere.
18. The method of any one of claims 12 to 17, wherein generating, by the light source assembly, the first probe beam and the second probe beam comprises:
the first and second probe beams are generated time-divisionally through the light source assembly.
19. The method according to any one of claims 12 to 18, further comprising:
and the first light beam to be detected is blocked in a time-sharing way through a first optical switch, and the second light beam to be detected is blocked in a time-sharing way through a second optical switch.
20. The method according to any one of claims 12 to 19, further comprising:
receiving the first detection beam through a first beam splitter to obtain a first sub beam and a second sub beam, wherein the first sub beam irradiates the detected substance to generate a first beam to be detected;
receiving the second detection beam through a second beam splitter to obtain a third sub-beam and a fourth sub-beam, wherein the third sub-beam irradiates the detected substance to generate a second beam to be detected;
the first light beam to be detected, the second sub light beam, the second light beam to be detected and the fourth sub light beam are received through the detector in a time-sharing mode, the second sub light beam is demodulated through the detector to obtain a third electric signal, and the fourth sub light beam is demodulated through the detector to obtain a fourth electric signal.
21. The method of claim 20, wherein the time-sharing receiving of the first to-be-detected beam, the second sub-beam, the second to-be-detected beam, and the fourth sub-beam by the detector comprises:
the detector receives the light beam in the following order: the second sub-beam, the first beam to be detected, the fourth sub-beam and the second beam to be detected.
22. The method according to any one of claims 12 to 19, further comprising:
generating a target light beam by the light source assembly;
receiving the first light beam to be detected, the target light beam and the second light beam to be detected in a time-sharing manner through the detector, and demodulating the target light beam through the detector to obtain a fifth electric signal;
obtaining a first detection result of the detected substance according to the fifth electric signal and the first electric signal;
and obtaining a second detection result of the detected substance according to the fifth electric signal and the second electric signal.
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| CN202110511127.XA CN115326727A (en) | 2021-05-11 | 2021-05-11 | Spectrum detection system and method |
| PCT/CN2022/076815 WO2022237264A1 (en) | 2021-05-11 | 2022-02-18 | Spectral testing method and system |
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| CN202110511127.XA CN115326727A (en) | 2021-05-11 | 2021-05-11 | Spectrum detection system and method |
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| JP3865982B2 (en) * | 1999-11-25 | 2007-01-10 | 独立行政法人科学技術振興機構 | Time division wavelength multiplexed pulsed light generator |
| US7709821B2 (en) * | 2005-04-27 | 2010-05-04 | Advanced Cytometry Instrumentation Systems, Inc. | Flow cytometer acquisition and detection system |
| CN103592253A (en) * | 2013-11-06 | 2014-02-19 | 安徽皖仪科技股份有限公司 | Laser gas analyzer for precise temperature compensation in concentration of gas to be measured |
| CN109507140B (en) * | 2018-10-16 | 2020-04-10 | 四方光电股份有限公司 | High-precision infrared gas sensor and gas analysis method |
| CN109459390A (en) * | 2018-12-20 | 2019-03-12 | 天津同阳科技发展有限公司 | A kind of fast analyser of liquid food ingredient |
| CN110346779B (en) * | 2019-06-17 | 2022-12-02 | 华东师范大学 | Measuring method for time channel multiplexing of multi-beam laser radar |
| CN210604388U (en) * | 2019-06-27 | 2020-05-22 | 安徽大学 | Device for rapidly and accurately detecting wheat grain vomitoxin through differential single-photon Raman sensing |
| CN211206789U (en) * | 2019-10-31 | 2020-08-07 | 山东交通学院 | Color laser radar imaging device |
| CN112285051A (en) * | 2020-10-20 | 2021-01-29 | 国网重庆市电力公司电力科学研究院 | Optical detection system |
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