CN115326727A - Spectrum detection system and method - Google Patents

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

A kind of spectral detection system and method

technical field

The present application relates to the technical field of detection, in particular to a spectral detection system and method.

Background technique

The spectral detection system can determine the chemical composition and relative content of the detected substance through spectral analysis. Specifically, a spectral detection system generally includes a light source component and a detector. The light source assembly is used to generate the probe beam. When the detection beam irradiates the substance to be detected, the detection beam is reflected or transmitted to generate a light beam to be detected. The detector is used for receiving the light beam to be detected, and generating an electrical signal according to the light beam to be detected. In order to facilitate the observation of the light beam to be detected, the electrical signal can be used to generate a spectrum of the detected substance. Different substances have different spectra. Therefore, by analyzing the spectrum of the detected substance, the chemical composition and relative content of the detected substance can be determined.

Among them, the price of the detector is relatively expensive, resulting in a relatively high overall cost of the spectral detection system.

Contents of the invention

The present application provides a spectrum detection system and method. By sharing one detector with two light beams to be detected, the number of detectors can be reduced and the cost of the spectrum detection system can be reduced.

The first aspect of the present application provides a spectrum detection system. The spectral detection system includes a light source assembly and a detector. Wherein, the light source component is used to generate the first detection beam and the second detection beam, and the transmission path of the first detection beam is different from the transmission path of the second detection beam. The first detection light beam is irradiated onto the substance to be detected to generate a first light beam to be detected. The second detection light beam is irradiated onto the substance to be detected to generate a second light beam to be detected. The detector is used to time-divisionally receive the first to-be-detected beam and the second to-be-detected beam, obtain a first electrical signal by demodulating the first to-be-detected beam, and obtain a second electrical signal by demodulating the second to-be-detected beam.

In the present application, the detector receives the first light beam to be detected and the second light beam to be detected in time division, that is, the two light beams to be detected share one detector. Therefore, the present application can reduce the number of detectors, thereby reducing the cost of the spectral detection system.

In an optional manner of the first aspect, the detected substance includes a first detected substance and a second detected substance. The first detection beam is irradiated onto the first detected substance to generate a first detected light beam. The second detection light beam is irradiated to the second detected substance to generate a second detection light beam.

In an optional manner of the first aspect, the spectral detection system further includes a first optical fiber, a second optical fiber, and a beam combiner. The first optical fiber is used to transmit the first light beam to be detected. The second optical fiber is used for transmitting the second light beam to be detected. The 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 to time-divisionally receive the first light beam to be detected and the second light beam to be detected through the two input ports, and output the first light beam to be detected and the second light beam to be detected to the detector. Wherein, by adding a beam combiner, the number of ports of the detector can be reduced, thereby reducing the cost of the detector.

In an optional manner of the first aspect, the spectrum detection system further includes a target optical fiber. The input port of the target fiber is connected to the output port of the combiner. The target optical fiber is used to receive the first light beam to be detected and the second light beam to be detected from the beam combiner in time division, and output the first light beam to be detected and the second light beam to be detected to the detector. Wherein, by adding the target optical fiber, the restriction on the position of the detector can be reduced, thereby improving the flexibility of designing the spectrum detection system.

In an optional manner of the first aspect, the first optical fiber is a multimode optical fiber. Wherein, different substances to be detected have different sensitive wavelength bands, that is, for different substances to be detected, the wavelength range of the first light beam to be detected is different. Multimode fiber can transmit a wider range of wavelengths, thereby increasing the types of substances that can be detected.

In an optional manner of the first aspect, the target optical fiber is a multimode optical fiber. Among them, different substances to be detected have different sensitive bands. Therefore, the wavelength ranges of the first light beam to be detected and the second light beam to be detected may be different. Multimode fiber can transmit a larger wavelength range, thereby increasing the types of substances that can be detected and improving the detection capability of the spectral detection system.

In an optional manner of the first aspect, the spectral detection system further includes an integrating sphere. The integrating sphere is connected with the input end of the first optical fiber. Wherein, the integrating sphere can collect the first light beam to be detected, reduce the loss of the first light beam to be detected, and improve detection accuracy.

In an optional manner of the first aspect, the light source component is used to time-divisionally generate the first detection beam and the second detection beam. Wherein, the time-sharing control by the light source component can reduce the complexity of the spectrum detection system, for example, reduce the number of optical switches. Therefore, the present application can reduce the cost of the spectral detection system.

In an optional manner of the first aspect, the spectrum 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 on the transmission path of the second light beam to be detected. The first optical switch is used to block the first light beam to be detected in time division. The second optical switch is used for time-sharing blocking of the second light beam to be detected. Among them, by adding an optical switch, the requirements on the light source components can be reduced, and the service life of the light source components can be improved.

In an optional manner of the first aspect, the time interval between the first light beam to be detected and the second light beam to be detected is greater than 10 milliseconds. Wherein, when the detector receives the first light beam to be detected and the second light beam to be detected at the same time, errors may occur in the detection result of the detected substance by the spectral detection system. By setting the time interval between the first to-be-detected beam and the second to-be-detected beam, the detector can avoid receiving the first to-be-detected beam and the second to-be-detected beam at the same time, thereby improving detection accuracy.

In an optional manner 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 to receive the first detection beam to obtain the first sub-beam and the second sub-beam. The first sub-beam irradiates the substance to be detected to generate a first light beam to be detected. The second beam splitter is used to receive the second detection beam to obtain the third sub-beam and the fourth sub-beam. The third sub-beam irradiates the substance to be detected to generate a second light beam to be detected. The detector is used to receive the first to-be-detected beam, the second sub-beam, the second to-be-detected beam and the fourth sub-beam in time division, obtain the third electrical signal by demodulating the second sub-beam, and obtain the third electrical signal by demodulating the fourth sub-beam Fourth electrical signal. Wherein, through the third electrical signal and the first electrical signal, the spectral detection system can eliminate environmental noise, thereby improving the accuracy of detecting the detected substance. Similarly, through the fourth electrical signal and the second electrical signal, the spectral detection system can eliminate environmental noise, thereby improving the accuracy of detecting the detected substance. Moreover, in the present application, the first beam to be detected, the second sub-beam, the second beam to be detected and the fourth sub-beam share one detector, thereby reducing the number of detectors and reducing the cost of the spectrum detection system.

In an optional manner of the first aspect, the detector is configured to receive light beams in the following order: the second sub-beam, the first to-be-detected light beam, the fourth sub-beam and the second to-be-detected light beam. Wherein, it is assumed that the duration of each beam is t, and the interval between different beams is 0. In the present application, after 2t, the spectral detection system may try to obtain the detection result of the detected substance according to the second sub-beam and the first to-be-detected light beam. In another feasible solution, the detector receives light beams in the following order: the second sub-beam, the fourth sub-beam, the first to-be-detected light beam and the second to-be-detected light beam. At this time, after 3t, the spectral detection system can try to obtain the detection result of the detected substance. Therefore, the present application can improve detection efficiency.

In an optional manner of the first aspect, the system further includes a processor. The light source assembly is also used to generate the target beam. The detector is used to time-divisionally receive the first light beam to be detected, the target light beam and the second light beam to be detected, and obtain the fifth electrical signal by demodulating the target light beam. The processor is used to obtain a first detection result of the detected substance according to the fifth electrical signal and the first electrical signal. The processor is also used to obtain a second detection result of the detected substance according to the fifth electrical signal and the second electrical signal. Wherein, the target beam is used as a reference beam for the first beam to be detected and the second beam to be detected. By sharing the reference beams, the number of reference beams can be reduced on the basis of eliminating environmental noise, thereby reducing the cost of light source components.

The second aspect of the present application provides a spectral detection method. The spectral detection method includes: generating a first detection beam and a second detection beam by a light source component. The transmission path of the first detection beam is different from the transmission path of the second detection beam. The first detection light beam is irradiated onto the substance to be detected to generate a first light beam to be detected. The second detection light beam is irradiated onto the substance to be detected 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 by the detector in time division. The first electrical signal is obtained by demodulating the first light beam to be detected by the detector, and the second electrical signal is obtained by demodulating the second light beam to be detected by the detector.

In an optional manner of the second aspect, the detected substance includes a first detected substance and a second detected substance. The first detection beam is irradiated onto the first detected substance to generate a first detected light beam. The second detection light beam is irradiated to the second detected substance to generate a second detection light beam.

In an optional manner of the second aspect, the spectral detection method further includes: transmitting the first light beam to be detected through the first optical fiber. The second to-be-detected light beam is transmitted through the second optical fiber. The first light beam to be detected and the second light beam to be detected are time-divisionally received through the two input ports of the beam combiner, and the first light beam to be detected and the second light beam to be detected are output to the detector.

In an optional manner of the second aspect, the spectral detection method further includes: receiving the first light beam to be detected and the second light beam to be detected from the beam combiner in time division through the target optical fiber, and outputting the first light beam to be detected to the detector and the second light beam to be detected.

In an optional manner of the second aspect, the first optical fiber is a multimode optical fiber.

In an optional manner of the second aspect, the target optical fiber is a multimode optical fiber.

In an optional manner of the second aspect, the spectral detection method further includes: outputting the first light beam to be detected to the first optical fiber through an integrating sphere.

In an optional manner of the second aspect, the first detection light beam and the second detection light beam are time-divisionally generated by the light source component.

In an optional manner of the second aspect, the spectral detection method further includes: blocking the first light beam to be detected in time division by the first optical switch, and blocking the second light beam to be detected in time division by the second optical switch.

In an optional manner of the second aspect, the time interval between the first light beam to be detected and the second light beam to be detected is greater than 10 milliseconds.

In an optional manner of the second aspect, the spectral detection method further includes: receiving the first detection beam through the first beam splitter to obtain the first sub-beam and the second sub-beam. The first sub-beam irradiates the substance to be detected to generate a first light beam to be detected. The second probe beam is received by the second beam splitter to obtain a third sub-beam and a fourth sub-beam. The third sub-beam irradiates the substance to be detected to generate a second light beam to be detected. The first light beam to be detected, the second sub-beam, the second light beam to be detected and the fourth sub-beam are received by the detector in time division. The second sub-beam is demodulated by the detector to obtain the third electrical signal, and the fourth sub-beam is demodulated by the detector to obtain the fourth electrical signal.

In an optional manner of the second aspect, the detector receives the light beams in the following order: the second sub-beam, the first to-be-detected light beam, the fourth sub-beam and the second to-be-detected light beam.

In an optional manner of the second aspect, the spectral detection method further includes: generating a target light beam through a light source component. The first light beam to be detected, the target light beam and the second light beam to be detected are received by the detector in time division. The fifth electrical signal is obtained by demodulating the target beam through the detector. A first detection result of the detected substance is obtained according to the fifth electrical signal and the first electrical signal. A second detection result of the detected substance is obtained according to the fifth electrical signal and the second electrical signal.

The third aspect of the present application provides a computer storage medium, which is characterized in that instructions are stored in the computer storage medium, and when the instructions are executed on the computer, the computer executes any of the methods described in the second aspect or the second aspect. A method described in one embodiment.

The fourth aspect of the present application provides a computer program product, which is characterized in that, when the computer program product is executed on a computer, the computer executes the method described in the second aspect or any implementation manner of the second aspect .

Description of drawings

Fig. 1 is a structural representation of spectral detection system;

Fig. 2 is the first schematic structural diagram of the spectral detection system provided in the present application;

Fig. 3 is the second structural schematic diagram of the spectral detection system provided in the present application;

FIG. 4 is a timing diagram of time-sharing control of light sources provided in this application;

Fig. 5 is the third schematic structural diagram of the spectral detection system provided in the present application;

FIG. 6 is a timing diagram of an optical switch provided in the present application;

Figure 7 is a schematic flow chart of the spectral detection method provided in the present application;

FIG. 8 is the first timing diagram of the detector receiving the light beam provided in the present application;

Fig. 9 is the second timing diagram of the detector receiving the light beam provided in the present application;

Figure 10 is a timing diagram of the substance to be detected on the conveyor belt provided in the present application;

Figure 11 is a fourth structural schematic diagram of the spectrum detection system provided in this application;

Fig. 12 is the third timing diagram of the detector receiving the light beam provided in the present application;

Fig. 13 is a fifth structural schematic diagram of the spectral detection system provided in this application;

FIG. 14 is the fourth timing diagram of the light beam received by the detector provided in this application.

Detailed ways

The application provides a spectral detection system and method. In the present application, by sharing one detector with two light beams to be detected, the number of detectors can be reduced, thereby reducing the cost of the spectral detection system. It should be understood that "first", "second" and the like used in the present application are only used for the purpose of distinguishing and describing, and cannot be interpreted as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, reference numerals and/or letters are repeated in the various figures of this application for the sake of brevity and clarity. Repetition does not imply a strictly limited relationship between the various embodiments and/or configurations.

The spectral detection system and method provided in this application can be applied to the field of detection technology. In the field of detection technology, the chemical composition and relative content of the detected substance can be determined through spectral analysis. After the detection beam irradiates the substance to be detected, the detection beam is reflected or transmitted to generate a light beam to be detected. When the spectral detection system includes multiple light beams to be detected, each light beam to be detected in the multiple light beams to be detected needs to correspond to a detector. For example, FIG. 1 is a schematic structural diagram of a spectral 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 used to generate a first detection beam and a second detection beam. The first detection light beam is irradiated onto the detected substance 102 to generate a first detection light beam. The second detection light beam is irradiated onto the detected substance 103 to generate a second detection light beam. The detector 104 is used for receiving the first light beam to be detected, and demodulating the first light beam to be detected to obtain a first electrical signal. The detector 105 is used for receiving the second light beam to be detected, and demodulating the second light beam to be detected to obtain a second electrical signal. At this time, the spectral detection system includes two light beams to be detected. The two beams to be detected are respectively a first beam to be detected and a second beam to be detected. The first light beam to be detected corresponds to the detector 104 , and the second light beam to be detected corresponds to the detector 105 .

Among them, the detector is more expensive. For example, the main material of the detector for near-infrared spectroscopy can be Indium Gallium Arsenide (InGaAs). InGaAs is expensive. When the number of light beams to be detected in the spectral detection system is large, the spectral detection system requires more detectors, resulting in higher overall cost of the spectral detection system.

To this end, the present application provides a spectrum detection system. In a spectral detection system, the two beams to be detected share a single detector. Specifically, FIG. 2 is a first structural schematic diagram of the spectral detection system provided in this application. As shown in FIG. 2 , the spectral detection system includes a light source assembly 201 and a detector 203 . The spectrum detection system is used to detect the chemical composition and relative content of the detected substance 2021 . The detected substance 202 includes a detected substance 2021 and a detected substance 2022 . The light source assembly 201 is used to generate a first detection beam and a second detection beam. The first detection beam is irradiated onto the substance to be detected 2021 (also referred to as the first substance to be detected) to generate a first light beam to be detected. The second detection beam is irradiated onto the substance to be detected 2022 (also referred to as the second substance to be detected) to generate a second light beam to be detected. The detector 203 is used to receive the first light beam to be detected and the second light beam to be detected in time division. The detector 203 is also used 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 this application, the detector 203 receives the first to-be-detected light beam and the second to-be-detected light beam in time division, that is, two to-be-detected light beams share one detector. Therefore, the present application can reduce the number of detectors, thereby reducing the cost of the spectral detection system. For example, the spectral detection system in FIG. 1 includes two detectors, and the spectral detection system in FIG. 2 includes one detector.

It should be understood that in FIG. 2 , the transmission paths of the first detection beams at different times are the same without changing the transmission paths of the first detection beams. At this time, the detector 203 receives the first light beams to be detected at different times in time division. In order to distinguish from this solution, the present application defines that the transmission paths of the first detection beam and the second detection beam are different. The detector 203 receives the first light beam to be detected and the second light beam to be detected in time division.

In other embodiments, the spectral detection system further includes a processor. The processor may perform different processing on the electrical signal obtained by the detector 203 as required. For example, after the detector 203 obtains the first electric signal and the second electric signal, the processor is used to obtain the first spectrum according to the first electric signal, and obtain the second spectrum according to the second electric 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 spectrum model, and outputs a first detection result. The first detection result is used to indicate the analysis result of the first substance to be detected by the spectral detection system. In subsequent embodiments, the first detection result will be described with examples. Similarly, after the detector 203 obtains the second electrical signal, the processor inputs the second electrical signal into the spectrum model, and outputs a second detection result.

The light source assembly 201 may include one or two light sources. When the light source assembly 201 includes one light source, the spectral detection system in FIG. 2 is in a shared light source mode. In the shared light source mode, the spectral detection system also includes a spectroscopic module. The beam splitting module can be a beam splitter, a beam splitting prism, etc. After the light source generates the detection beam, the light splitting module divides the detection beam into a first detection beam and a second detection beam. When the light source assembly 201 includes two light sources, the spectral detection system in FIG. 2 is in an independent light source mode. In the independent light source mode, two light sources and two probe beams correspond one-to-one. Specifically, the two light sources include a first light source and a second light source. The first light source is used to generate a first detection beam, and the second light source is used to generate a second detection beam.

The present application does not limit the structure of the light source assembly 201 . For example, in practical applications, the light source assembly 201 may also include an objective lens module, a grating and the like. Wherein, when the objective lens module includes a convex mirror, the objective lens module can focus the detection beam. When the objective lens module includes a mirror, the objective lens module can change the transmission path of the detection beam. The grating is used to select the wavelength of the detection beam and change the wavelength range of the detection beam.

It should be understood that in FIG. 2 , the first light beam to be detected is obtained after the first detection light beam is reflected. In practical applications, the first light beam to be detected may be obtained after the first detection light beam is transmitted.

It should be understood that in FIG. 2 , the detected substance 2021 and the detected substance 2022 belong to different individuals. In practical applications, the detected substance 2021 and the detected substance 2022 may belong to the same individual. For example, when the first detection beam and the second detection beam irradiate the same piece of 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 spectral detection system may also include more light beams to be detected. For example, on the basis of FIG. 2 , the light source assembly 201 is also used to generate a third detection beam. The third detection light beam is irradiated onto the detected substance 2022 to generate a third to-be-detected light beam. The detector 203 is used to receive the first to-be-detected beam, the second to-be-detected beam and the third to-be-detected beam in time division. The detector 203 is also used to demodulate the third light beam to be detected to obtain a third electrical signal.

In the spectral detection system of the present application, multiple light beams to be detected share one detector. At this time, multiple light beams to be detected need to reach the same detector. In practical applications, it is difficult to directly reflect or transmit the detection beam to the same detector after the detection beam irradiates the detected substance by designing the spectral detection system. For this reason, the spectral detection system of the present application also includes an optical fiber. An optical fiber is used to transmit the light beam to be detected. Specifically, FIG. 3 is a second structural schematic diagram of the spectrum detection system provided in this application. As shown in Figure 3, the spectral 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 an optical fiber) is the target fiber), processor 307.

The integrating sphere 301 is used to collect the first light beam to be detected to reduce the loss of the first light beam to be detected. The output end of the integrating sphere 301 is connected with the optical fiber 303 . The output end of the optical fiber 303 is connected to a beam combiner 305 . The optical fiber 303 is used to transmit the first light beam to be detected, and output the first light beam to be detected to the beam combiner 305 . Similarly, the integrating sphere 303 is used to collect the second to-be-detected light beam to reduce loss of the second to-be-detected light beam. The output end of the integrating sphere 302 is connected with the optical fiber 304 . The output end of the optical fiber 304 is connected to a beam combiner 305 . The optical fiber 304 is used to transmit the second light beam to be detected, and output the second light beam to be detected to the beam combiner 305 .

The two input ports of the beam combiner 305 are respectively connected to the optical fiber 303 and the optical fiber 304 . The output port of the beam combiner 305 is connected to the optical fiber 306 . The beam combiner 305 is used to receive the first light beam to be detected and the second light beam to be detected time-divisionally through two input ports, and output the first light beam to be detected and the second light beam to be detected to the optical fiber 306 in time-division. The input port of the optical fiber 306 is connected to the beam combiner 305 . The output port of the optical fiber 306 is connected to the detector 203 . The optical fiber 306 is used to receive the first light beam to be detected and the second light beam to be detected from the beam combiner 305 in time division, and output the first light beam to be detected and the second light beam to be detected to the detector 203 . The detector 203 is used to receive the first light beam to be detected and the second light beam to be detected in time division. The detector 203 is also used 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 performs corresponding processing on the first electrical signal and the second electrical signal according to requirements. For details, reference may be made to the foregoing description of the processor.

In other embodiments, optical fiber 303 and/or optical fiber 306 are multimode optical fibers. Wherein, different substances to be detected have different sensitive wavelength bands, that is, for different substances to be detected, the wavelength range of the first light beam to be detected is different. Multimode fiber can transmit a wider range of wavelengths, thereby increasing the types of substances that can be detected. In particular, when the substance to be detected 2021 and the substance to be detected are not 2022 at the same time, the wavelength ranges of the first light beam to be detected and the second light beam to be detected may be different. At this time, the optical fiber 306 needs to transmit both the first light beam to be detected and the second light beam to be detected. Therefore, when the optical fiber 306 is a multimode optical fiber, the detected substance 2021 and the detected substance 2022 may be different substances, thereby improving the detection capability of the spectrum detection system.

In other embodiments, the wavelength ranges of the first detection beam and the second detection beam are the same. In industrial production processes, it is often necessary to use a spectral detection system to detect the same substance on multiple channels, such as apples on multiple conveyor belts. At this time, the detected substance 2021 and the detected substance 2022 are the same substance, and the sensitive wavelength bands of the detected substance 2021 and the detected substance 2022 are the same. The spectral detection system uses the detection beam in the same wavelength range to detect the detected substance.

It should be understood that Fig. 3 is an example of the spectrum detection system provided in this application. In practical applications, those skilled in the art can make adaptive modifications according to actual needs. After the adaptive modification, if multiple light beams to be detected of the spectral detection system share one detector, it should still fall within the scope of protection of the present application. Adaptive modifications include but are not limited to any of the following.

For example, in FIG. 2, probe 203 includes a receive port. In practical application, the detector 203 includes two receiving ports. The two receiving ports are connected to the optical fiber 303 and the optical fiber 304 respectively. At this time, the spectral detection system may not include the beam splitter and the 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 larger number of light beams to be detected. For example, on the basis of FIG. 3 , the spectral detection system further includes a third detected substance and a third optical fiber. The light source assembly 201 is also used to generate a third detection beam. The third detection beam is irradiated onto the third substance to be detected to generate a third light beam to be detected. The third light beam to be detected reaches the beam combiner 305 after passing through the third optical fiber. The beam combiner 305 includes three input ports. The beam combiner 305 is used to time-divisionally receive the first light beam to be detected, the second light beam to be detected and the third light beam to be detected through three input ports. The detector 203 is used to receive the first light beam to be detected, the second light beam to be detected and the third light beam to be detected from the optical fiber 306 in time division. The detector 203 is also used to demodulate the third light beam to be detected to obtain a third electrical signal.

In the spectral detection system of the present application, the detector 203 is used to receive multiple light beams to be detected in time division. Therefore, the spectral detection system can perform time-sharing control of the light beam to be detected. The time-sharing control includes light source time-sharing control and/or blocking time-sharing control. They are described respectively below.

Firstly, in the time-sharing control of the light source, the light source component is used to generate the first detection beam and the second detection beam in time-sharing. For example, FIG. 4 is a time sequence diagram of the time-sharing control of the light source provided in this application. As shown in FIG. 4 , between time t0 and time t1 , the light source assembly generates the first detection light beam. Between time t2 and time t3, the light source assembly generates a second detection beam. Similarly, the cycle repeats in turn.

There is a time interval between time t1 and time t2. The time interval between time t1 and time t2 is also referred to as the time interval between the first detection beam and the second detection 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 time t1 and time t2 is also referred to as the first beam to be detected and the second beam to be detected Time interval between beams. In other embodiments, the time interval between the first light beam to be detected and the second light beam to be detected is greater than 10 milliseconds.

Secondly, in blocking time-sharing control, the spectral detection system also includes an optical switch. The optical switch is used to time-divisionally block the first light beam to be detected and the second light beam to be detected. For example, FIG. 5 is a third structural schematic diagram of the spectral detection system provided in this 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 to-be-detected light beam. The optical switch 504 is on the transmission path of the second light beam to be detected. The optical switch 503 is used to block the first light beam to be detected in time division. The optical switch 504 is used to block the second light beam to be detected in time division. For example, FIG. 6 is a timing diagram of an optical switch provided in this 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 passes through normally. The optical switch 503 is blocked between time t1 and time t3, and the first light beam to be detected cannot pass through. Similarly, the optical switch 504 is blocked between time t0 and time t2, and the second light beam to be detected cannot pass through. The optical switch 503 is turned on between time t2 and time t3, and the second light beam to be detected passes through normally.

It should be understood that the above two time-sharing controls are not contradictory. Therefore, in practical applications, the spectrum detection system can choose to adopt one or two time-sharing controls mentioned above.

The two time-sharing controls in this application have been described above, and the spectrum detection method in this application will be described below by taking the spectrum detection system shown in FIG. 5 as an example, combined with the timing diagram in FIG. 6 . Fig. 7 is a schematic flow chart of the spectral detection method provided in this application. As shown in Fig. 7, the spectral detection method includes the following steps.

In step 701, a first detection beam and a second detection beam are generated by a light source assembly.

As shown in FIG. 5 , the detected substance 2021 is located on the conveyor belt 501 , and the detected substance 2022 is located on the conveyor belt 502 . The conveying directions of the conveyor belt 501 and the conveyor belt 502 are shown by the arrows in the figure. On the conveyor belt 501, the substance to be detected 2021 passes continuously. On the conveyor belt 502, the substance to be detected 2022 passes continuously. The spectral detection system needs to detect the detected substances on the two conveyor belts through spectral analysis. The detected substances can be fruits, beverages, electronic products, etc. The light source assembly 201 continuously generates the first detection beam and the second detection beam.

In step 702, the first detection beam is irradiated to the substance to be detected to generate a first light beam to be detected, and the second detection beam is irradiated to the substance to be detected to generate a second light beam to be detected. The position to be detected by the first detection beam is referred to as a first detection point, and the first detection point is located on the conveyor belt 501 . The position to be detected by the second detection beam is referred to as a second detection point, and the second detection point is located on the conveyor belt 502 .

As shown in FIG. 6 , between the time t0 and the time t1 , the detected substance 2021 exists continuously at the first detection point. The first detection light beam continuously irradiates the detected substance 2021 to continuously generate the first detection light beam. The integrating sphere 301 collects the first to-be-detected light beam and transmits it to the beam combiner 305 through the optical fiber 303 . The beam combiner 305 transmits the first to-be-detected light beam to the detector 203 through the optical fiber 306 . Between time t0 and time t1, the detected substance 2022 does not exist at the second detection point. The second detection beam continues to irradiate the second detection point without generating a second detection beam.

Between time t1 and time t2, if there is no detected substance 2021 at the first detection point, the first detection beam continues to irradiate the first detection point, and no first detection light beam is generated. Between time t1 and time t2, the detected substance 2022 does not exist at the second detection point. The second detection beam continues to irradiate the second detection point without generating a second detection beam.

It should be understood that, between time t0 and time t2, even if the substance 2022 to be detected exists at the second detection point, when the second to-be-detected light beam generated by the second detection light beam passes through the optical switch 504, the optical switch 504 will block the second beam to be detected. At this time, the beam combiner 305 cannot receive the second to-be-detected light beam.

Between time t2 and time t3, the detected substance 2021 does not exist at the first detection point. The first detection light beam continuously irradiates the detected substance 2021 without generating the first detection light beam. Between the time t2 and the time t3, the detected substance 2022 persists at the second detection point. The second detection light beam continuously irradiates the second detection point to generate a second detection light beam. The integrating sphere 302 collects the second to-be-detected light beam and transmits it to the beam combiner 305 through the optical fiber 304 . The beam combiner 305 transmits the second to-be-detected light beam to the detector 203 through the optical fiber 306 .

It should be understood that, between time t1 and time t3, even if the substance 2021 to be detected exists at the first detection point, when the first light beam to be detected generated by the first detection light beam passes through the optical switch 503, the optical switch 503 will block the second beam to be detected. At this time, the beam combiner 305 cannot receive the first light beam to be detected.

In step 703, the first light beam to be detected and the second light beam to be detected are time-divisionally received by the detector.

According to the description in the aforementioned step 702, it can be known that the beam combiner 305 may receive the first light beam to be detected between time t0 and time t1. Fig. 8 is the first timing diagram of the light beam received by the detector provided in this application. At this time, as shown in FIG. 8 , the detector 203 receives the first light beam to be detected between time t0 and time t1 . It should be understood that, for the convenience of description, the present application ignores the time spent by the light beam in the transmission path. 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 time t1 and time t2 . 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 t3 . Therefore, the detector in the present application receives the first light beam to be detected and the second light beam to be detected in time division.

It should be understood that in FIG. 8, the time t1 is smaller than the time t2. There is an interval between time t1 and time t2, and within the interval, the detector 203 does not receive the light beam to be detected. In practical applications, the time t1 may be greater than the time t2. Specifically, FIG. 9 is a second timing diagram of the light beam received by the detector provided in this application. As shown in FIG. 9 , the detector 203 receives the first light beam to be detected between time t0 and time t1 . The detector 203 receives the second light beam to be detected between time t2 and time t3. The detector 203 receives the first light beam to be detected and the second light beam to be detected between time t2 and time t1. At this time, in FIG. 9 , the detector 203 receives the first light beam to be detected and the second light beam to be detected in time division. After the detector 203 obtains the electrical signal according to the light beam to be detected, the processor may discard the electrical signal between time t2 and time t1.

It should be understood that, in FIG. 8 and FIG. 9 , the detector 203 periodically receives the first light beam to be detected and the second light beam to be detected. In practical applications, the detector 203 may receive the first light beam to be detected and the second light beam to be detected aperiodically. For example, in FIG. 8 , the detector 203 receives the first light beam to be detected between time t4 and time t5 . In practical applications, there is no detected substance at the first detection point between time t4 and time t5. The first detection beam does not generate the first to-be-detected beam. At this time, the detector 203 does not receive the first light beam to be detected between time t4 and time t5. Afterwards, the detector 203 receives the second light beam to be detected between time t6 and time t7.

In step 704, the detector is used to demodulate the first light beam to be detected to obtain a first electrical signal, and the detector is used to demodulate the second light beam to be detected to obtain a second electrical signal.

The spectral model is stored in the processor 307 . 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 to indicate the analysis result of the first substance to be detected by the spectral detection system. For example, the first detection result may be a composition list of the detected substance 2021 . Alternatively, the first detection result is qualified or unqualified. For example, the first detected substance 2021 is an apple. After the processor 307 determines the components of the apple through the spectral model, it determines that there are abnormal components in the apple. Unusual ingredients are pesticide residues. The first detection result output by the processor 307 is unqualified. 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.

It can be known from the foregoing descriptions of FIG. 4 and FIG. 6 that the spectral detection system in the present application can perform time-sharing control of the light beam to be detected. It should be understood that in practical applications, the spectral detection system can also control the time sequence of the detected substances to achieve time-sharing control. For example, in Figure 5, the processor is also used to generate control signals. 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 passes through the conveyor belt normally. Therefore, the control mechanism can control the position of the detected substance on the conveyor belt, and then control when the detected substance exists on the first detection point. Specifically, FIG. 10 is a timing diagram of the detected substance on the conveyor belt provided in this application. As shown in FIG. 10 , the detected substance 2021 exists at the first detection point between time t0 and time t1 . At this time, the first detection beam is irradiated onto the substance to be detected 2021 to generate a first beam to be detected. There is no detected substance 2021 at the first detection point between time t1 and time t3. At this time, the first detection beam is not irradiated on the substance 2021 to be detected, and the first beam to be detected is not generated. Similarly, there is no detected substance 2022 at the second detection point between time t0 and time t2. At this time, the second detection beam is not irradiated on the substance 2022 to be detected, and the second to-be-detected beam is not generated. The detected substance 2022 exists at the second detection point between time t2 and time t3. At this time, the second detection light beam is irradiated onto the detected substance 2022 to generate a second to-be-detected light beam. Therefore, time-sharing control can also be realized through the control mechanism.

It should be understood that in the application, the optical switch 503 can reduce the influence of interfering light beams. For example, between the time t1 and the time t2, if there is no detected substance 2021 at the first detection point, the first detection beam continues to irradiate the first detection point. If the first detection beam passes through the first detection point and irradiates other substances, such as a conveyor belt, an interference beam is generated. Or, in the application environment of the spectral detection system, there are other interfering light beams, such as lighting lights. The integrating sphere 301 can also generate a light beam to be detected by collecting interfering light beams. However, due to the existence of the optical switch 503, the optical switch 503 will block the light beam to be detected, thereby reducing the influence of the interfering light beam.

The spectral detection method in the present application has been described above. According to the foregoing description, it can be known that the optical switch 503 can reduce the influence of interfering light beams. Disturbing beams can also be understood as ambient noise. The spectrum detection system provided in this application is described below. On the basis of reducing environmental noise, multiple light beams and sub-beams to be detected in the spectrum detection system share a detector. Specifically, FIG. 11 is a fourth structural schematic diagram of the spectral detection system provided in this application.

As shown in Figure 11, on the basis of Figure 5, the spectral detection system also includes a beam splitter 1101 (also called a first beam splitter), a beam splitter 1102 (also called a second beam splitter), an optical fiber 1103 , Optical fiber 1104. Wherein, the beam splitter 1101 is used to receive the first detection beam to obtain the first sub-beam and the second sub-beam. The first sub-beam irradiates the detected substance 2021 to generate a first detected light beam. The beam splitter 1102 is used to receive the second probe beam to obtain a third sub-beam and a fourth sub-beam. The third sub-beam irradiates the detected substance 2022 to generate a second to-be-detected light beam. For the description of the first to-be-detected light beam and the second to-be-detected light beam, please refer to the foregoing description of FIG. 3 . The optical fiber 1103 is used to transmit the second sub-beam, and transmit the second sub-beam to the beam combiner 305 . The optical fiber 1104 is used to transmit the fourth sub-beam, and transmit the fourth sub-beam to the beam combiner 305 . The beam combiner 305 is used to time-divisionally receive the first beam to be detected, the second sub-beam, the second beam to be detected and the fourth sub-beam. The detector 203 is used to receive 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 time division. The detector 203 is also used 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 environmental noise. Specifically, the second sub-beam and the first to-be-detected beam carry similar ambient noise. Approximate environmental noise will also be carried between the electrical signals obtained through the second sub-beam and the first to-be-detected beam. Through algorithm processing, environmental noise can be eliminated. For example, the third electrical signal is subtracted from the first electrical signal, and the difference after subtraction is added to the original electrical signal for generating the first detection beam to obtain the spectrum of the detected substance 2021 . Similarly, the processor 307 is also configured to process the fourth electrical signal and the second electrical signal to eliminate environmental noise. By eliminating ambient noise, the accuracy of spectral detection can be improved. Moreover, the first to-be-detected beam, the second sub-beam, the second to-be-detected beam and the fourth sub-beam share one detector, thereby reducing the number of detectors and reducing the cost of the spectrum detection system.

In other embodiments, the detector 203 is configured to receive light beams in the following order: the second sub-beam, the first to-be-detected light beam, the fourth sub-beam and the second to-be-detected light beam. For example, FIG. 12 is the third timing diagram of the light beam received by the detector provided in this application. As shown in FIG. 12 , the detector 203 receives the second sub-beam between time t0 and time t1 . The detector 203 receives the first light beam to be detected between time t2 and time t3. The detector 203 receives the fourth sub-beam between time t4 and time t5. The detector 203 receives the second light beam to be detected between time t6 and time t7. At this time, after t3 has elapsed, the spectral detection system may try to obtain the detection result of the detected substance 2021 .

In FIG. 11 , the second sub-beam is the reference beam of the first beam to be detected, and the fourth sub-beam is the reference beam of the second beam to be detected. In other embodiments, when the wavelength ranges of the first to-be-detected light beam and the second to-be-detected light beam are the same, the spectral detection system may share the reference beam. For example, FIG. 13 is a fifth structural schematic diagram of the spectral detection system provided in this application. As shown in FIG. 13 , on the basis of FIG. 5 , the spectral detection system further includes an optical fiber 1303 . The light source assembly 201 is also used to generate a target light beam. The optical fiber 1303 is used for transmitting the target beam, and transmits the target beam to the beam combiner 305 . The beam combiner 305 is used to time-divisionally receive the first to-be-detected beam, the target beam and the second to-be-detected beam. The detector 203 is used to receive the first light beam to be detected, the target light beam and the second light beam to be detected from the beam combiner 305 in time division. For example, FIG. 14 is the fourth timing diagram of the light beam received by the detector provided in this application. As shown in FIG. 14 , the detector 203 receives the fourth detection beam between time t0 and time t1 . The detector 203 receives the first light beam to be detected between time t2 and time t3. The detector 203 receives the second light beam to be detected between time t4 and time t5.

The detector 203 is also used to demodulate the target beam to obtain the fifth electrical signal. The processor 307 is configured to eliminate environmental noise according to the target light beam and the first electrical signal, and obtain a first detection result of the detected substance 2021 . The processor 307 is configured to eliminate 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 beam to be detected and the second beam to be detected. Spectral detection systems share a reference beam.

In other embodiments, the fourth detection beam may be the second sub-beam in FIG. 11 mentioned above. At this time, the spectral detection system further includes a first beam splitter. The first beam splitter is used to obtain the first sub-beam and the second sub-beam according to the first detection beam. The first sub-beam irradiates the detected substance 2021 to generate a first detected light beam. The detector 203 is used to demodulate the second sub-beam to obtain the fifth electrical signal.

The above is only the specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application, and should cover Within the protection scope of this 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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