Reflection-type gas measurement spectrum sensing device

Abstract

The invention discloses a reflective gas measurement spectrum sensing device which comprises a light source, a spectrograph, a reflective gas measurement cell and a Y-shaped optical fiber, a first light splitting end of the Y-shaped optical fiber is connected with the light source, a beam combining end of the Y-shaped optical fiber is connected with the reflective gas measuring cell, and a second light splitting end of the Y-shaped optical fiber is connected with the spectrograph. The light source, the spectrograph and the reflective gas measuring cell are connected through the Y-shaped optical fiber by utilizing the light absorption characteristic of a gas substance, the measuring light emitted by the light source is emitted into the reflective gas measuring cell through the beam combining end of the Y-shaped optical fiber to be reflected, then is received by the beam combining end of the Y-shaped optical fiber, and is guided into the spectrograph through the second light splitting end of the Y-shaped optical fiber, so that the gas is measured. Therefore, on-line gas monitoring, such as on-line detection of pollution sources, production processes, electrical equipment, cable joint operation and the like, is completed. The device is economical, effective and stable in performance.

Description

Technical Field

[0001] The invention belongs to the technical field of optical analysis instruments, and in particular relates to a reflective gas measurement spectrum sensor device. Background Art

[0002] Industrial safety online measurement requires that the measurement sensor module be as small as possible. There are two main types of gas measurement sensors currently in common use: electrochemical sensors and optical gas cells. However, electrochemical sensors are easily contaminated and their performance degrades, or even become unusable. In the currently commonly used gas measurement technology, the optical gas cell and the measurement host are fixed on site at the same time, which is not conducive to achieving one machine controlling multiple measurement points.

[0003] Therefore, it is necessary to develop a cost-effective and stable gas sensing technology based on the light absorption characteristics of gas substances, which can control multiple measurement points with one machine, for industrial safety online measurement, especially for monitoring the physical state of cable joints. Summary of the invention

[0004] The main purpose of the present invention is to provide a reflective gas measurement spectrum sensor device for industrial safety online measurement to solve the above technical problems.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A reflective gas measurement spectrum sensing device, comprising a light source, a spectrometer, a reflective gas measurement cell and a Y-type optical fiber; the first light splitting end of the Y-type optical fiber is connected to the light source, the beam combining end thereof is connected to the reflective gas measurement cell, and the second light splitting end thereof is connected to the spectrometer;

[0007] The measuring light emitted by the light source enters the reflective gas measuring cell through the beam combining end of the Y-type optical fiber, is reflected by the reflector, is received by the beam combining end of the Y-type optical fiber, and is introduced into the spectrometer through its second beam splitting end.

[0008] In a possible implementation, the reflective gas measurement cell includes a shell provided with an air inlet and an air outlet, and a single optical fiber and a concave reflector arranged in the shell, one end of the single optical fiber is arranged at the center of the concave reflector, and the other end extends out of the shell and is connected to the bundle end of the Y-type optical fiber.

[0009] In a possible implementation, the reflective gas measurement cell includes a shell provided with an air inlet and an air outlet, and a single optical fiber, a collimator and a plane reflector arranged in the shell, the collimator is arranged in front of the plane reflector, one end of the single optical fiber is arranged at the front focus of the collimator, and the other end extends out of the shell and is connected to the bundle end of the Y-type optical fiber.

[0010] In a possible implementation manner, the single optical fiber and the combined end of the Y-type optical fiber are coaxially connected via a fiber coupler.

[0011] In a possible implementation manner, an air pump is provided at the air inlet and / or the air outlet of the shell, and the measured gas circulates in and out of the reflective gas measurement cell through the air pump.

[0012] In a possible implementation manner, a plurality of air inlet holes and air outlet holes are provided on the shell, and the measured gas circulates in and out of the reflective gas measurement cell in a diffused manner.

[0013] In a possible implementation manner, an anti-corrosion coating is provided on the inner wall of the housing.

[0014] In a possible implementation, a control module is further included, and the light source and the spectrometer are electrically connected to the control module respectively.

[0015] In a possible implementation, a display device is further included, and the display device is electrically connected to the control module and is used for inputting instructions and displaying measurement results.

[0016] In a possible implementation, the light source is a broad spectrum light source including an ultraviolet spectrum.

[0017] The beneficial effect of adopting the above technical solution is that: the present invention utilizes the absorption characteristics of gaseous substances to light, connects the light source, spectrometer and reflective gas measuring cell through a Y-type optical fiber, and the measuring light emitted by the light source is emitted into the reflective gas measuring cell through the beam combining end of the Y-type optical fiber and reflected by the reflector, and then received by the beam combining end of the Y-type optical fiber and introduced into the spectrometer through its second light splitting end, thereby completing online gas measurement, such as online detection of pollution sources, production processes, electrical equipment and cable joint operation. The device is economical and effective, and has stable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and the description thereof are used to explain the present invention and do not constitute improper limitations on the present invention.

[0019] Figure 1 is a schematic structural diagram of a reflective gas measurement spectrum sensing device provided in an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the optical path of the measuring light in the reflective gas measurement spectrum sensing device provided in an embodiment of the present invention;

[0021] Figure 3 It is a structural schematic diagram of a reflective gas measurement cell in a reflective gas measurement spectrum sensing device provided in an embodiment of the present invention;

[0022] Figure 4 It is a structural schematic diagram of another reflective gas measurement cell in the reflective gas measurement spectrum sensing device provided in an embodiment of the present invention;

[0023] Figure 5 It is a schematic diagram of coupling a Y-type optical fiber with a single optical fiber in a reflective gas measurement spectrum sensing device provided in an embodiment of the present invention.

[0024] In the figure:

[0025] 1. Light source; 2. Spectrometer; 3. Reflection gas measuring cell; 31. Shell; 311. Air inlet; 312. Air outlet; 32. Single optical fiber; 33. Concave reflector; 34. Collimator; 35. Plane reflector; 36. Air pump; 4. Y-type optical fiber; 41. First light splitting end; 42. Combining end; 43. Second light splitting end; 5. Optical fiber coupler; 6. Control module; 7. Display device. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0027] In the description of the present invention, it should be clarified that the terms "vertical", "lateral", "longitudinal", "front", "rear", "left", "right", "up", "down", "horizontal" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not mean that the devices or elements referred to must have a specific direction or position, and therefore cannot be understood as limiting the present invention. The "quantity" mentioned above cannot be understood as limiting the present invention either.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] It should be understood that each element of a device or each step of a method can be described by a device term or a method term. Such terms can be replaced when necessary so that the implicit broad coverage of the present invention's authorization is clarified. As just one example, it should be understood that all steps of a method can be disclosed as an action, a means of taking the action, or an element causing the action. Similarly, each element of a device can be disclosed as a physical element or an action promoted by the physical element. As just one example, the disclosure of a "connector" should be understood to cover the disclosure of a "connection" action whether or not it is explicitly discussed-and on the contrary, if a "connection" action is disclosed, this disclosure should be understood to cover the disclosure of a "connector" and even a "device for connection". These alternative terms for each element or step should be understood to be explicitly included in the specification.

[0030] Example

[0031] The embodiment of the present invention provides a reflective gas measurement spectrum sensing device, such as Figure 1 As shown, it includes a light source 1, a spectrometer 2, a reflective gas measuring cell 3 and a Y-type optical fiber 4.

[0032] The first light splitting end 41 of the Y-type optical fiber 4 is connected to the light source 1 , the beam combining end 42 thereof is connected to the reflective gas measuring cell 3 , and the second light splitting end 43 thereof is connected to the spectrometer 2 .

[0033] When in use, the reflective gas measuring cell 3 is installed at the gas measuring site, and the reflective gas measuring cell 3 is filled with the gas to be measured. Figure 2 As shown, the measuring light emitted by the light source 1 is emitted into the reflective gas measuring cell 3 through the beam combining end 42 of the Y-type optical fiber 4, passes through the gas to be measured and is reflected by the reflector in the reflective gas measuring cell 3, and then is received by the beam combining end 42 of the Y-type optical fiber 4, and is introduced into the spectrometer 2 through its second beam splitting end 43 to obtain a reference spectrum.

[0034] After adopting the above technical scheme, the present invention utilizes the absorption characteristics of gaseous substances to light, and connects the light source 1, the spectrometer 2 and the reflective gas measuring cell 3 through a Y-type optical fiber 4. The measuring light emitted by the light source 1 is reflected by the beam combining end 42 of the Y-type optical fiber 4 into the reflective gas measuring cell 3, and then received by the beam combining end 42 of the Y-type optical fiber 4, and introduced into the spectrometer 2 through its second light splitting end 43 to obtain the reference spectrum of the gas to be measured, and then the Beer-Lambert law can be used to calculate the concentration of the substance in the gas to be measured. The device is economical and effective, and has stable performance. The present invention can also be used for gas measurement in different scenarios, such as online detection of pollution sources, production processes, electrical equipment, etc.

[0035] In a possible implementation, Figure 3As shown, the reflective gas measuring cell 3 is a single-reflective gas measuring cell, which includes a housing 31 , a single optical fiber 32 and a concave reflector 33 .

[0036] The shell 31 is provided with an air inlet 311 and an air outlet 312, the single optical fiber 32 and the concave reflector 33 are arranged in the shell 31, one end of the single optical fiber 32 is arranged at the center of the concave reflector 33, and the other end extends out of the shell 31 and is connected to the beam combining end 42 of the Y-type optical fiber 4. Through the above structure, the focusing point of the measuring light after being reflected by the concave reflector 33 coincides with the beam combining end 42 of the single optical fiber 32. In this way, the single optical fiber 32 can simultaneously transmit the measuring light and receive the reflected light absorbed by the gas to be measured.

[0037] In a possible implementation, Figure 4 As shown, the reflective gas measuring cell 3 may also be a collimated reflective gas measuring cell, which includes a housing 31 , a single optical fiber 32 , a collimating mirror 34 and a plane reflector 35 .

[0038] The shell 31 is provided with an air inlet 311 and an air outlet 312, the single optical fiber 32, the collimator 34 and the plane reflector 35 are arranged in the shell 31, the collimator 34 is arranged in front of the plane reflector 35, one end of the single optical fiber 32 is arranged at the front focus of the collimator 34, and the other end extends out of the shell 31 and is connected to the beam combining end 42 of the Y-type optical fiber 4. Through the above structure, the measuring light is first reflected by the plane reflector 35, and then the focusing point after refraction by the collimator 34 coincides with the beam combining end 42 of the single optical fiber 32. In this way, the single optical fiber 32 can simultaneously transmit the measuring light and receive the reflected light absorbed by the gas to be measured.

[0039] According to different applications, the housing 31 of the reflective gas measuring cell 3 can be made of metal (such as aluminum and stainless steel) or non-metallic material (such as organic glass).

[0040] In an optional embodiment, Figure 5 As shown, the reflective gas measuring cell 3 also includes a fiber optic coupler 5, which coaxially and tightly fixes the bundle end 42 of the Y-type optical fiber 4 and the single optical fiber 32 together, ensuring that the measuring light emitted by the light source 1 is effectively introduced into the reflective gas measuring cell 3 and the reflected light absorbed by the gas to be measured is effectively introduced into the fiber optic spectrometer 2 to achieve corresponding gas measurement.

[0041] Furthermore, an anti-corrosion coating is coated on the inner wall of the shell 31 of the reflective gas measuring cell 3 to prevent the shell 31 from being corroded.

[0042] Furthermore, an air pump 36 is provided at the air inlet 311 and / or the air outlet 312 of the shell 31 , and the measured gas circulates in and out of the reflective gas measuring cell 3 through the air pump 36 .

[0043] In addition, a plurality of air inlet holes 311 and air outlet holes 312 may be provided on the shell 31 , respectively, so that the measured gas circulates in and out of the reflective gas measuring cell 3 in a diffused manner.

[0044] Furthermore, the reflective gas measurement spectrum sensor device further comprises a control module 6, and the control module 6 is used to control the operation of the reflective gas measurement spectrum sensor device. The light source 1 and the spectrometer 2 are electrically connected to the control module 6 respectively. When an air pump 36 is provided at the air inlet 311 and / or the air outlet 312 of the housing 31, the control module 6 can also control the operation of the air pump 36.

[0045] Furthermore, the reflective gas measurement spectrum sensor device also includes a display device 7, which can be integrated on the control module 6 or provided separately. The display device 7 is used to input instructions and display measurement results.

[0046] In an optional embodiment, the light source 1 is a broad spectrum light source including an ultraviolet spectrum, such as an LED, a xenon lamp, a deuterium lamp, etc.

[0047] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A reflective gas measurement spectrum sensing device, characterized in that: It includes a light source, a spectrometer, a reflective gas measuring cell and a Y-type optical fiber; the first light splitting end of the Y-type optical fiber is connected to the light source, the beam combining end thereof is connected to the reflective gas measuring cell, and the second light splitting end thereof is connected to the spectrometer; The measuring light emitted by the light source enters the reflective gas measuring cell through the beam combining end of the Y-type optical fiber, is reflected by the reflector, is received by the beam combining end of the Y-type optical fiber, and is introduced into the spectrometer through its second beam splitting end.

2. The reflective gas measurement spectrum sensor device according to claim 1, characterized in that: The reflective gas measuring cell comprises a shell provided with an air inlet and an air outlet, and a single optical fiber and a concave reflector arranged in the shell. One end of the single optical fiber is arranged at the center of the concave reflector, and the other end extends out of the shell and is connected to the bundle end of the Y-type optical fiber.

3. The reflective gas measurement spectrum sensor device according to claim 1, characterized in that: The reflective gas measuring cell comprises a shell provided with an air inlet and an air outlet, and a single optical fiber, a collimator and a plane reflector arranged in the shell. The collimator is arranged in front of the plane reflector. One end of the single optical fiber is arranged at the front focus of the collimator, and the other end extends out of the shell and is connected to the bundle end of the Y-type optical fiber.

4. The reflective gas measurement spectrum sensor device according to claim 2 or 3, characterized in that: The single optical fiber and the bundled end of the Y-shaped optical fiber are coaxially connected via an optical fiber coupler.

5. The reflective gas measurement spectrum sensor device according to claim 2 or 3, characterized in that: An air pump is provided at the air inlet and / or the air outlet of the shell, and the measured gas circulates in and out of the reflective gas measuring cell through the air pump.

6. The reflective gas measurement spectrum sensor device according to claim 2 or 3, characterized in that: The shell is provided with a plurality of air inlet holes and air outlet holes, and the measured gas circulates in and out of the reflective gas measuring cell in a diffused manner.

7. The reflective gas measurement spectrum sensor device according to claim 2 or 3, characterized in that: The inner wall of the shell is provided with an anti-corrosion coating.

8. The reflective gas measurement spectrum sensor device according to claim 1, characterized in that: It also includes a control module, and the light source and the spectrometer are electrically connected to the control module respectively.

9. The reflective gas measurement spectrum sensor device according to claim 8, characterized in that: It also includes a display device, which is electrically connected to the control module and is used to input instructions and display measurement results.

10. The reflective gas measurement spectrum sensor device according to claim 1, characterized in that: The light source is a broad spectrum light source including the ultraviolet spectrum.

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