Spectroscopic detection device and detection system

Abstract

The utility model discloses a kind of spectroscopic detection devices, for carrying out spectroscopic detection to liquid to be detected, spectroscopic detection device includes shell, hollow cavity is formed in shell, fluid pipe is arranged in cavity, fluid pipe is used to flow liquid to be detected, the periphery of the pipe wall of fluid pipe is provided with light-transmitting part, the outside of light-transmitting part is respectively provided with the light-emitting component and photoelectric detector located in shell, light ray emitted by light-emitting component can pass through the light-transmitting part of fluid pipe and the liquid to be detected in fluid pipe and be received by photoelectric detector, light-emitting component includes optical fiber, one end of optical fiber is formed with light outlet end face, photoelectric detector is provided with detection surface, the detection surface of photoelectric detector and the light outlet end face of optical fiber are oppositely arranged on the outside of the pipe wall of fluid pipe.In addition, the utility model also discloses a kind of spectroscopic detection system.The spectroscopic detection device and spectroscopic detection system of the utility model are applicable to liquid detection scene, with small volume, high degree of modularization, no pollution and the like advantages.

Description

Technical Field

[0001] This application relates to the field of spectral detection device technology, and in particular to a spectral detection device and detection system. Background Technology

[0002] Spectroscopic analysis technology is an analytical method based on optical principles. It obtains information about the chemical composition and properties of substances by measuring their absorption or emission of light at different wavelengths. It is widely used in chemical analysis, biomedicine, materials science, environmental monitoring, and food safety. A spectroscopic probe is a front-end device used to acquire and measure spectral data.

[0003] In liquid detection scenarios, existing grating spectrometers are difficult to place in narrow liquid flow channels due to their large probe modules. If the probe modules are miniaturized, there is a problem with the small transmitted light receiving area, resulting in low detection resolution of the detection device, which cannot meet the usage requirements. Existing technologies also include some spectral detection devices such as Fourier spectrometers, which have the advantages of small size and high resolution, but also have the disadvantage of high cost. Utility Model Content

[0004] This application aims to address one of the technical problems in related technologies to a certain extent. To this end, this application provides a spectral detection device and system suitable for liquid detection scenarios, which has advantages such as small size, high modularity, and no pollution.

[0005] Firstly, to achieve the above objectives, this application adopts the following technical solution: a spectral detection device for performing spectral detection on a liquid to be tested. The spectral detection device includes a housing, a hollow cavity is formed inside the housing, a fluid tube is disposed inside the cavity, the fluid tube is used to circumferentially flow the liquid to be tested, a light-transmitting portion is disposed on the circumferential direction of the tube wall of the fluid tube, and a light-emitting component and a photodetector are respectively disposed on the outer side of the light-transmitting portion and located inside the housing. The light emitted by the light-emitting component can pass through the light-transmitting portion of the fluid tube and the liquid to be tested inside the fluid tube and be received by the photodetector. The light-emitting component includes an optical fiber, one end of which is formed with a light-emitting end face. The photodetector is provided with a detection surface, and the light-emitting end face of the optical fiber and the detection surface of the photodetector are disposed opposite to each other on the outer side of the tube wall of the fluid tube.

[0006] In this technical solution, a fluid tube is installed within a hollow cavity formed inside the casing, allowing the liquid to be tested to flow within the tube. A light-transmitting section is provided on the tube wall, with a light-emitting component and a photodetector positioned on either side of the section. Light emitted from the light-emitting component passes through the light-transmitting section and the liquid inside the tube before being received by the photodetector. The photodetector generates an electrical signal based on the intensity of the received light, ultimately achieving spectral detection of the liquid. By placing the light-emitting component and photodetector on opposite sides of the fluid tube for spectral detection, space utilization is improved, resulting in a more compact and rational structure for the spectral detection device. Furthermore, the relative placement of the light-emitting component and photodetector enhances the detection resolution and accuracy of the results. Additionally, the separate placement of the light-emitting component and photodetector on opposite sides of the fluid tube facilitates long-term, real-time monitoring of parameter changes in the liquid flowing within the tube.

[0007] Preferably, the fluid tube is provided with a plurality of light-transmitting portions spaced apart, each light-transmitting portion including two light-transmitting windows disposed opposite each other on the side wall of the fluid tube, and the light-emitting end face of the optical fiber and the photodetector are respectively located outside one of the light-transmitting windows.

[0008] Preferably, the entire fluid tube is configured as a light-transmitting part, and the entire fluid tube is made of a transparent material.

[0009] Preferably, the light-transmitting window covers the light-emitting end face of the optical fiber and the detection surface of the photodetector.

[0010] Preferably, the light-emitting end face of the optical fiber and the detection surface of the photodetector are both disposed in close contact with or spaced apart from the outer surface of the light-transmitting part.

[0011] Preferably, a lens group is also provided on the light-emitting end face of the optical fiber, and the lens group includes at least one lens.

[0012] Preferably, the housing is provided with a through hole, the photodetector is electrically connected to a signal line, the signal line and the optical fiber are passed through the through hole, and a sealing connector is also provided in the through hole so that the hollow cavity forms a sealed cavity.

[0013] Preferably, the hollow cavity is filled with an anti-oxidation gas to prevent the photodetector from being oxidized.

[0014] Secondly, to achieve the above objectives, this application also provides a spectral detection system, including a spectral detection device and a control device, wherein the spectral detection device is configured as described in any one of the above technical solutions. The reasoning process for the beneficial effects of the spectral detection system provided in this application is similar to that of the aforementioned spectral detection devices, and will not be repeated here.

[0015] Preferably, the optical fiber and the photodetector of the spectral detection device are connected to the control device.

[0016] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0017] The following description, in conjunction with the accompanying drawings, further illustrates this application: Figure 1 This is a schematic diagram of the structure of a spectral detection device according to an embodiment of this application (with the housing open). Figure 2 This is a schematic diagram of another spectral detection device according to an embodiment of this application (with the housing open); Figure 3 This is a schematic diagram of the connection structure between the optical fiber and the lens group according to an embodiment of this application; Figure 4 This is a schematic diagram of the spectral detection system according to an embodiment of this application; Figure 5 This is a schematic diagram of the circuit connection structure of the spectral detection system according to an embodiment of this application; Figure 6 This is a circuit block diagram of the control device according to an embodiment of this application; Figure 7 This is a circuit block diagram of the spectral chip according to an embodiment of this application.

[0018] Among them, 100 is the spectral detection device; 110 is the housing; 120 is the fluid tube; 121 is the light-transmitting window; 130 is the optical fiber; 131 is the lens group; 1311 is the lens; 1312 is the lens support; 140 is the photodetector; 141 is the signal line; and 200 is the control device. Detailed Implementation

[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0020] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0021] A spectroscopic detection device 100 is a device that obtains information such as the chemical composition and physical properties of a substance by measuring its absorption and reflection of light at different wavelengths. It is widely used in chemical analysis, biomedicine, materials science, environmental monitoring, and food safety. However, in these fields, the requirements for the spectroscopic detection device 100 vary depending on the form of the substance being detected. In liquid detection scenarios, existing spectroscopic detection devices 100 are still relatively large, making them difficult to install in narrow liquid flow channels. Miniaturizing the probe module results in a small transmitted light receiving area, leading to lower detection resolution and failing to meet usage requirements. Existing technologies also include spectroscopic detection devices 100 such as Fourier spectrometers, which offer advantages such as small size and high resolution, but also suffer from high costs.

[0022] like Figure 1 , 2 As shown, a spectral detection device 100 is used for spectral detection of a liquid to be tested. Specifically, in this embodiment, the spectral detection device 100 is the detection probe of a spectrometer. The spectral detection device 100 includes a housing 110, in which a hollow cavity is formed. A fluid tube 120 is disposed within the cavity, and the fluid tube 120 is used to circumferentially flow the liquid to be tested. A light-transmitting portion is disposed on the circumferential side of the tube wall of the fluid tube 120. A light-emitting component and a photodetector 140 are respectively disposed on the outer side of the light-transmitting portion, both located within the housing 110. The light emitted by the light-emitting component can pass through the light-transmitting portion of the fluid tube 120 and the liquid to be tested within the fluid tube 120 and be received by the photodetector 140. The light-emitting component includes an optical fiber 130, one end of which has a light-emitting end face. The photodetector 140 has a detection surface, and the light-emitting end face of the optical fiber 130 and the detection surface of the photodetector 140 are disposed opposite to each other on the outer side of the tube wall of the fluid tube 120.

[0023] In this embodiment, the spectral detection device 100 uses a fluid tube 120 disposed within a hollow cavity formed inside the housing 110. The liquid to be detected flows within the fluid tube 120. A light-transmitting portion is disposed on the wall of the fluid tube 120, and a light-emitting component and a photodetector 140 are respectively disposed on both sides of the light-transmitting portion. Light emitted by the light-emitting component passes through the light-transmitting portion and the liquid to be detected inside the fluid tube 120 before being received by the photodetector 140. The photodetector 140 generates an electrical signal based on the illumination parameters of the received light, ultimately achieving spectral detection of the liquid to be detected. By distributing the light-emitting component and the photodetector 140 on opposite sides of the fluid tube 120 for spectral detection, space utilization is improved, making the structure of the spectral detection device 100 more compact and rational. Furthermore, the relative arrangement of the light-emitting component and the photodetector 140 improves the detection resolution of the spectral detection device 100, enhancing the accuracy of the detection results. Moreover, distributing the light-emitting component and the photodetector 140 on opposite sides of the fluid tube 120 facilitates long-term real-time monitoring of parameter changes in the liquid flowing within the fluid tube 120. The spectral detection device 100 in this embodiment is used for liquid detection, for example, for real-time monitoring of wine, and can acquire parameters such as the wine's output temperature and alcohol content in real time.

[0024] In some embodiments, such as Figure 1 As shown, the fluid tube 120 is provided with a plurality of spaced-apart light-transmitting portions. Each light-transmitting portion includes two light-transmitting windows 121 arranged opposite each other on the side wall of the fluid tube 120. The light-emitting end face of the optical fiber 130 and the photodetector 140 are respectively located outside one of the light-transmitting windows 121. The two light-transmitting windows 121 are arranged opposite each other on the side wall of the fluid tube 120, forming an optical path channel through the fluid tube 120 between them. The light-emitting end face of the optical fiber 130 and the photodetector 140 are respectively located outside the two light-transmitting windows 121. Light emitted from the light-emitting end face of the optical fiber 130 passes through the liquid to be detected in the fluid tube 120 and is received by the photodetector 140. The photodetector 140 converts the received optical signal into an electrical signal and outputs it to an external controller. In this embodiment, the light-transmitting window 121 is made of a light-transmitting material such as glass, plastic, or resin.

[0025] Specifically, such as Figure 1As shown, the light-transmitting window 121 covers the light-emitting end face of the optical fiber 130 and the detection surface of the photodetector 140. The light-emitting end face and the photodetector 140 are arranged opposite to each other, each located outside one of the light-transmitting windows 121. The two light-transmitting windows 121 are arranged opposite to each other and cover the light-emitting end face of the optical fiber 130 and the detection surface of the photodetector 140, respectively. The light-emitting end face of the optical fiber 130 is attached to one of the light-transmitting windows 121, and the detection surface of the photodetector 140 is attached to the other light-transmitting window 121. Attaching the light-emitting end face and the detection surface to the light-transmitting window 121 respectively can reduce light attenuation and improve detection accuracy. It is understood that in other embodiments, the light-emitting end face of the optical fiber 130 and / or the detection surface of the photodetector 140 may also be spaced apart from the light-transmitting window 121.

[0026] In some embodiments, such as Figure 2 As shown, the entire fluid tube 120 is designed as a light-transmitting part, and the entire fluid tube 120 is made of a transparent material. Alternatively, the entire fluid tube 120 is made of a light-transmitting material, with the light-emitting end face of the optical fiber 130 and the photodetector 140 arranged in pairs opposite each other on the sidewall of the fluid tube 120 to achieve real-time monitoring of the liquid flowing through the fluid tube 120. Specifically, the light-emitting end face of the optical fiber 130 and the detection surface of the photodetector 140 are both closely attached to the outer surface of the light-transmitting part. In this embodiment, the entire fluid tube 120 is designed as a light-transmitting part, meaning that the light-emitting end face of the optical fiber 130 and the detection surface of the photodetector 140 are attached to the outer wall of the fluid tube 120, and the light-emitting end face and the detection surface are opposite each other, so that the light emitted from the light-emitting end face can pass through the fluid tube 120 and enter the photodetector 140.

[0027] In some embodiments, such as Figure 3 As shown, a lens group 131 is also provided on the light-emitting end face of the optical fiber 130, and the lens group 131 includes at least one lens 1311. The lens group 131 is used to control and adjust the light beam in the optical fiber 130. The spot size can be controlled by setting the focal length of the lens group 131. The lens group 131 can be a collimating lens or a beam expander. Figure 3 A schematic diagram of the connection structure of an optical fiber 130 and a lens group 131 is shown. The light-emitting end face of the optical fiber 130 and the lens 1311 are arranged opposite to each other and fixed by a lens bracket. The incident surface of the lens 1311 faces the light-emitting end face of the optical fiber 130, and the emitting surface faces the fluid tube 120.

[0028] In some embodiments, the housing 110 is provided with a through hole, and the photodetector 140 is electrically connected to a signal line 141. The signal line 141 and the optical fiber 130 pass through the through hole, and a sealing connector is also provided in the through hole to form a sealed cavity in the hollow cavity. The sealing connector is made of sealing materials such as rubber or polymer to prevent gas leakage inside the housing 110 or the intrusion of external substances into the housing 110.

[0029] In some embodiments, the hollow cavity is filled with an anti-oxidation gas to prevent the photodetector 140 from being oxidized. Filling the hollow cavity within the housing 110 with an anti-oxidation gas can prevent the spectral detection module from being oxidized or corroded. The anti-oxidation gas can be, for example, nitrogen.

[0030] like Figure 4 As shown, this embodiment also provides a spectral detection system, including a spectral detection device 100 and a control device 200. The spectral detection device 100 is configured as described in any of the above embodiments. The reasoning process for the beneficial effects of the spectral detection system in this embodiment and the spectral detection device 100 in the above embodiments is similar, and will not be repeated here.

[0031] Specifically, such as Figure 4 , 5 As shown, the optical fiber 130 and photodetector 140 of the spectral detection device 100 are signal-connected to the control device 200. This signal connection includes both optical and electrical signal connections; specifically, the optical fiber 130 is optically connected to the control device 200, and the photodetector 140 is electrically connected to the control device 200 via signal line 141. The control device 200 is the entirety of the spectrometer components excluding the detection probe, including, for example, a light source, a spectral chip, a controller, or a processor (control unit). The optical fiber 130 connects to the light source within the control device 200, and the photodetector 140 is electrically connected to the controller or processor (control unit) of the control device 200 via signal line 141.

[0032] Specifically, such as Figure 6 , 7As shown, the control device 200 of the spectral detection system in this embodiment includes a control unit, a sampling circuit unit, a driving circuit unit, a light source, and a spectral chip unit. The control unit is used to receive the sampling signal input by the sampling circuit unit, process the spectral information of the sampling signal, and output the spectral detection result. It is also used to output a control signal to control the operation of the driving circuit unit. The sampling circuit unit is an analog-to-digital converter. The sampling circuit unit receives the analog electrical signal from the photodetector 140, converts it into a digital signal, and sends it to the control unit. The control unit outputs a control signal to control the operation of the driving circuit unit. The driving circuit unit drives the light source and the spectral chip to operate. The light source sends an optical signal to the spectral chip. The light source chip modulates the optical signal emitted by the light source and transmits the processed optical signal to the optical fiber 130, which is then used for spectral detection of the analyte.

[0033] As one implementation, the light source is a broadband light source, specifically such as an LED light source or a superluminescent diode (SLED). The wavelength of the light source can be selected according to the type of analyte and the actual application scenario. For example, when the analyte is alcohol, the wavelength of the light source is selected in the near-infrared band of 1200~1700nm. Furthermore, exemplarily, the spectral chip and the optical fiber 130 are connected by a fiber optic collimator, which is used to convert the diverging beam into parallel or quasi-parallel light to improve beam transmission efficiency.

[0034] As one implementation method, such as Figure 7 As shown, the spectral chip includes multiple cascaded active tunable spectral units. These active tunable spectral units can be configured as micro-ring resonators or Mach-Zehnder interferometers (MZIs). Therefore, the spectral chip can be constructed from structures such as cascaded micro-rings, cascaded Mach-Zehnder interferometers, or a hybrid cascade of micro-rings and Mach-Zehnder interferometers. Furthermore, each active tunable spectral unit also includes a phase modulator, which can tune the phase of the light signal entering the spectral chip according to the control signal from the control unit.

[0035] In summary, the beneficial effects of the spectral detection device 100 and spectral detection system in this embodiment are as follows: by setting the light-emitting component and the photoelectric detector on both sides of the fluid tube 120 respectively to achieve spectral detection, the space utilization rate is improved, and the structure of the spectral detection device 100 is more compact and reasonable; and by setting the light-emitting component and the photoelectric detector 140 relative to each other, the detection resolution of the spectral detection device 100 is improved, and the accuracy of the detection results is improved; furthermore, setting the light-emitting component and the photoelectric detector 140 on both sides of the fluid tube 120 respectively facilitates long-term real-time monitoring of the parameter changes of the liquid flowing in the fluid tube 120.

[0036] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. A spectral detection device (100) for performing spectral detection on a liquid to be tested, the spectral detection device (100) comprising a housing (110) having a hollow cavity formed therein, characterized in that, A fluid tube (120) is provided inside the cavity. The fluid tube (120) is used to flow the liquid to be tested. A light-transmitting part is provided on the circumferential direction of the tube wall of the fluid tube (120). A light-emitting component and a photodetector (140) located in the housing (110) are respectively provided on the outside of the light-transmitting part. The light emitted by the light-emitting component can pass through the light-transmitting part of the fluid tube (120) and the liquid to be tested in the fluid tube (120) and be received by the photodetector (140). The light-emitting component includes an optical fiber (130). One end of the optical fiber (130) is formed with a light-emitting end face. The photodetector (140) is provided with a detection surface. The light-emitting end face of the optical fiber (130) and the detection surface of the photodetector (140) are arranged opposite to each other on the outside of the tube wall of the fluid tube (120).

2. The spectral detection device (100) according to claim 1, characterized in that, The fluid tube (120) is provided with a plurality of light-transmitting parts spaced apart. Each light-transmitting part includes two light-transmitting windows (121) arranged opposite to each other on the side wall of the fluid tube (120). The light-emitting end face of the optical fiber (130) and the photodetector (140) are respectively located outside one of the light-transmitting windows (121).

3. The spectral detection device (100) according to claim 1, characterized in that, The fluid tube (120) is entirely made of transparent material.

4. The spectral detection device (100) according to claim 2, characterized in that, The light-transmitting window (121) covers the light-emitting end face of the optical fiber (130) and the detection surface of the photodetector (140).

5. The spectral detection device (100) according to any one of claims 1 to 4, characterized in that, The light-emitting end face of the optical fiber (130) and the detection surface of the photodetector (140) are both closely attached to or spaced apart from the outer surface of the light-transmitting part.

6. The spectral detection device (100) according to any one of claims 1 to 4, characterized in that, The optical fiber (130) is further provided with a lens group (131) on the light-emitting end face, and the lens group (131) includes at least one lens (1311).

7. The spectral detection device (100) according to any one of claims 1 to 4, characterized in that, The housing (110) is provided with a wire hole, the photodetector (140) is electrically connected to a signal line (141), the signal line (141) and the optical fiber (130) are passed through the wire hole, and a sealing connector is also provided in the wire hole so that the hollow cavity forms a sealed cavity.

8. The spectral detection device (100) according to claim 7, characterized in that, The hollow cavity is filled with an anti-oxidation gas to prevent the photodetector (140) from being oxidized.

9. A spectral detection system, comprising a spectral detection device (100) and a control device (200), characterized in that, The spectral detection device (100) is configured as the spectral detection device (100) as described in any one of claims 1 to 8.

10. The spectral detection system according to claim 9, characterized in that, The optical fiber (130) and the photodetector (140) of the spectral detection device (100) are signal-connected to the control device (200).

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