Non-contact infrared concentration measuring device

Abstract

The utility model provides a non-contact infrared concentration measuring device, which belongs to the technical field of gas concentration measurement and comprises a gas infrared probe, an infrared host and a computer. The gas infrared probe comprises an incident light optical fiber, an emergent light optical fiber, a probe tube, a fixing screw, a lens holder, a locking nut, a lens base, a gas channel, an emitting surface and a reflecting surface, the gas channel is arranged between the emitting surface and the reflecting surface, and the lens holder is adjustably connected with the lens base through the locking nut; the incident light optical fiber and the emergent light optical fiber are made of silver halide polycrystalline glass fiber optical fibers, and PEEK polymer protective sleeves are arranged outside the incident light optical fiber and the emergent light optical fiber. The gas concentration measuring device can be used for collecting and measuring the concentration of gas in a high-pressure state or special gas with corrosivity, virulence and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas concentration measurement, and in particular relates to a non-contact infrared concentration measuring device. Background Art

[0002] The application areas of gas concentration detection instruments cover many aspects such as industrial and agricultural production, environmental quality monitoring, national defense, aerospace, and family life. For example, in industrial production, accurately mastering the concentration of flammable and explosive gases is crucial to ensuring production safety. In the field of environmental monitoring, timely understanding of changes in the concentration of gases such as carbon dioxide helps to assess air quality and respond to climate change. In family life, detecting the concentration of harmful gases can ensure the health and safety of residents.

[0003] As an advanced detection method, infrared gas concentration detection technology has been widely used and valued due to its significant advantages, including strong selectivity, stable performance, high sensitivity, large dynamic measurement range, low external interference, and long service life. However, in existing technologies, most infrared concentration measurement devices require direct contact with the gas to perform measurements. This brings with it a series of disadvantages. First, if the gas being measured is corrosive, long-term direct contact can cause erosion and damage to the instrument's components, significantly shortening its service life. For example, in the chemical industry, strong acid or strong base gases often encountered can corrode the probes, sensors, and other components of the measuring device, causing performance degradation or even failure. Second, if the gas is highly toxic, prolonged contact can affect the stability and accuracy of the instrument. Moreover, contact-based measurement methods cannot measure gases under high pressure. Utility Model Content

[0004] In view of this, the utility model provides a non-contact infrared concentration measuring device, which can collect and measure the concentration of gases under high pressure or special gases such as corrosive and highly toxic gases.

[0005] The utility model is achieved in this way:

[0006] The utility model provides a non-contact infrared concentration measuring device, comprising a gas infrared probe, an infrared host and a computer, wherein the gas infrared probe comprises an incident light optical fiber, an outgoing light optical fiber, a probe tube, a fixing screw, a lens holder, a locking nut, a mirror seat, a gas channel, an emitting surface and a reflecting surface, the gas channel is arranged between the emitting surface and the reflecting surface, and the lens holder and the mirror seat are adjustably connected through the locking nut.

[0007] The technical effects of a non-contact infrared concentration measuring device provided by the utility model are as follows: by setting a gas infrared probe, an infrared host and a computer, it is used to realize contactless information collection of the gas, which facilitates the subsequent measurement of its gas concentration based on the collected information; it can further prevent long-term measurement caused by corrosive gases or toxic gases, which will shorten the service life of instrument components and affect the stability and accuracy of instrument measurement; and it can also measure and collect gases under high pressure. By setting an adjustable lens frame and mirror mount, it is used to adjust the distance between the emitting surface and the reflecting surface, that is, the intensity of the returned infrared light can be adjusted, which provides more measurement conditions for measuring gases of different concentrations and types.

[0008] On the basis of the above technical solution, the non-contact infrared concentration measuring device of the present invention can also be improved as follows:

[0009] The incident light fiber and the outgoing light fiber are made of silver halide polycrystalline glass fiber, and a PEEK polymer protective sheath is provided on the outside of the incident light fiber and the outgoing light fiber.

[0010] Furthermore, the ends of the incident light fiber and the output light fiber are provided with SMA interfaces, and are directly connected to the infrared host via a fiber optic coupler.

[0011] Furthermore, the infrared host is communicatively connected to the computer.

[0012] Furthermore, the probe is made of a nickel-based corrosion-resistant alloy to provide good corrosion resistance and thermal stability.

[0013] Furthermore, the gas channel is a cylindrical channel made of transparent single-crystal calcium fluoride material, which is used to provide higher infrared transmittance.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting up a gas channel, the transmittance of the calcium fluoride window exceeds 80% within the infrared spectrum range, which can effectively transmit infrared light signals. It also has excellent thermal stability and can perform infrared measurement and monitoring under high temperature conditions. It also has corrosion resistance and chemical resistance and can be used for a long time in corrosive environments such as acids and alkalis. This characteristic enables the gas channel composed of calcium fluoride to be applied to gas concentration measurement under more conditions.

[0015] Furthermore, the probe tube and the lens holder are fixedly connected via the fixing screws.

[0016] Furthermore, the emitting surface is arranged on a side of the lens holder close to the lens base, and the reflecting surface is arranged on a side of the lens base.

[0017] Furthermore, one end of the lens holder is telescopically and movably connected to one end of the lens holder via a tough member, and the locking nut is arranged on the outside of the lens holder.

[0018] Furthermore, the outer wall surface of the mirror holder is provided with a threaded structure adapted to the inner wall of the locking nut, and the locking nut is used to cooperate with the tough member to adjust and fix the distance between the emitting surface and the reflecting surface.

[0019] The beneficial effect of adopting the above-mentioned improvement scheme is: by arranging a tough piece to cooperate with the locking nut to fix the adjustment position between the lens frame and the lens seat, the locking nut locks the tough piece and clamps the outer end surface of the lens frame.

[0020] Compared with the prior art, the non-contact infrared concentration measurement device provided by the present invention has the following beneficial effects: by providing a gas infrared probe, an infrared host and a computer, it is used to realize contactless information collection of the gas, facilitating the subsequent measurement of its gas concentration based on the collected information; it can further prevent long-term measurement caused by corrosive or toxic gases from shortening the service life of the instrument components and affecting the stability and accuracy of the instrument measurement; and it can also measure and collect gas under high pressure. By providing an adjustable lens holder and mirror mount, it is used to adjust the distance between the emitting surface and the reflecting surface, that is, the intensity of the returned infrared light can be adjusted, which provides more measurement conditions for measuring different concentrations and different types of gases; by providing a gas channel, the transmittance of the calcium fluoride window exceeds 80% within the infrared spectrum range, which can effectively transmit infrared light signals, and also has excellent thermal stability, capable of infrared measurement and monitoring under high temperature conditions, and also has corrosion resistance and chemical resistance, and can be used for a long time in corrosive environments such as acids and alkalis. This characteristic makes the gas channel composed of calcium fluoride applicable to gas concentration measurement under more conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a schematic diagram of the side and top structure of a non-contact infrared concentration measurement device;

[0023] Figure 2 This is a schematic diagram of the operating principle of a non-contact infrared concentration measurement device;

[0024] Figure 3A schematic diagram of adjusting a gas infrared probe of a non-contact infrared concentration measurement device;

[0025] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0026] 1. Incident light fiber; 10. Reflecting surface; 11. Infrared host; 12. Computer; 13. Gas infrared probe; 2. Outgoing light fiber; 3. Probe tube; 4. Fixing screw; 5. Lens holder; 6. Locking nut; 7. Lens holder; 8. Gas channel; 9. Emitting surface. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention.

[0028] like Figure 1-3 As shown, an embodiment of a non-contact infrared concentration measuring device provided by the utility model is shown. In this embodiment, it includes a gas infrared probe 13, an infrared host 11 and a computer 12, wherein the gas infrared probe 13 includes an incident light fiber 1, an output light fiber 2, a probe 3, a fixing screw 4, a lens holder 5, a locking nut 6, a mirror holder 7, a gas channel 8, an emitting surface 9 and a reflecting surface 10. The gas channel 8 is arranged between the emitting surface 9 and the reflecting surface 10, and the lens holder 5 and the mirror holder 7 are adjustably connected by the locking nut 6.

[0029] The infrared host 11 is a Fourier infrared host, and the wavelength range of the infrared light that can be detected is 2 to 12 μm (corresponding to the wave number 5000 to 800 cm- 1 ).

[0030] During use, the incident light is emitted by the infrared host 11 and transmitted through the incident light optical fiber 1, and reaches the gas channel 8 of the gas infrared probe 13 through the emitting surface 9. The gas will absorb the light of the corresponding wavelength. The remaining light is reflected by the reflecting surface 10 and transmitted through the output light optical fiber 2 to reach the infrared host 11. The infrared host 11 detects the returned light signal and inputs it into the computer 12 to obtain the infrared characteristic spectrum of the gas to be measured, completing the acquisition. Subsequently, the obtained infrared characteristic spectrum can be displayed by the computer 12 through the spectrum acquisition module, and the concentration value of the sample to be measured can be calculated in real time using the spectral data combined with the chemometric algorithm, and displayed on the concentration display interface, thereby realizing in-situ online measurement of gas concentration changes.

[0031] In the above technical solution, the optical fiber material of the incident light optical fiber 1 and the output light optical fiber 2 is silver halide polycrystalline glass fiber, and the outside of the incident light optical fiber 1 and the output light optical fiber 2 is provided with a PEEK polymer protective sheath.

[0032] Among them, the infrared wavelength range that silver halide polycrystalline glass fiber can transmit is 4 to 18 μm (corresponding to wave number 2500 to 550 cm- 1 ).

[0033] Furthermore, in the above technical solution, the ends of the input optical fiber 1 and the output optical fiber 2 are provided with SMA interfaces, and are directly connected to the infrared host 11 through a fiber optic coupler.

[0034] Furthermore, in the above technical solution, the infrared host 11 is communicatively connected to the computer 12 .

[0035] Furthermore, in the above technical solution, the material of the probe 3 is a nickel-based corrosion-resistant alloy, which is used to provide good corrosion resistance and thermal stability.

[0036] Furthermore, in the above technical solution, the gas channel 8 is a cylindrical channel made of transparent single-crystal calcium fluoride material, which is used to provide higher infrared transmittance.

[0037] Furthermore, in the above technical solution, the probe tube 3 and the lens holder 5 are fixedly connected by fixing screws 4 .

[0038] Furthermore, in the above technical solution, the emitting surface 9 is arranged on a side of the lens holder 5 close to the lens base 7 , and the reflecting surface 10 is arranged on a side of the lens base 7 .

[0039] Furthermore, in the above technical solution, one end of the lens holder 7 is telescopically and movably connected to one end of the lens holder 5 via a tough member, and the locking nut 6 is arranged on the outside of the lens holder 7 .

[0040] Furthermore, in the above technical solution, the outer wall surface of the mirror holder 7 is provided with a threaded structure adapted to the inner wall of the locking nut 6 , and the locking nut 6 is used to cooperate with the tough part to adjust and fix the distance between the emitting surface 9 and the reflecting surface 10 .

[0041] Specifically, the principle of the present invention is: when in use, the incident light is emitted by the infrared host 11, transmitted through the incident light optical fiber 1, and reaches the gas channel 8 of the gas infrared probe 13 through the emitting surface 9. The gas will absorb the light of the corresponding wavelength. The remaining light is reflected by the reflecting surface 10 and transmitted through the output light optical fiber 2 to reach the infrared host 11. The infrared host 11 detects the returned light signal and inputs it into the computer 12 to obtain the infrared characteristic spectrum of the gas to be tested, completing the acquisition. Subsequently, the obtained infrared characteristic spectrum can be displayed by the computer 12 through the spectrum acquisition module, and the spectral data combined with the chemometric algorithm can be used to calculate the concentration value of the sample to be tested in real time, and displayed on the concentration display interface, thereby realizing in-situ online measurement of gas concentration changes.

Claims

1. A non-contact infrared concentration measuring device, comprising a gas infrared probe (13), an infrared host (11) and a computer (12), characterized in that: The gas infrared probe (13) comprises an incident light optical fiber (1), an emitting light optical fiber (2), a probe tube (3), a fixing screw (4), a lens frame (5), a locking nut (6), a mirror seat (7), a gas channel (8), an emitting surface (9) and a reflecting surface (10), wherein the gas channel (8) is arranged between the emitting surface (9) and the reflecting surface (10), and the lens frame (5) and the mirror seat (7) are adjustably connected via the locking nut (6).

2. A non-contact infrared concentration measuring device according to claim 1, characterized in that: The optical fiber material of the incident light optical fiber (1) and the outgoing light optical fiber (2) is silver halide polycrystalline glass fiber, and the outside of the incident light optical fiber (1) and the outgoing light optical fiber (2) is provided with a PEEK polymer protective sheath.

3. A non-contact infrared concentration measuring device according to claim 2, characterized in that: The ends of the incident light fiber (1) and the outgoing light fiber (2) are provided with SMA interfaces, and are directly connected to the infrared host (11) via a fiber optic coupler.

4. A non-contact infrared concentration measuring device according to claim 3, characterized in that: The infrared host (11) is communicatively connected with the computer (12).

5. The non-contact infrared concentration measuring device according to claim 4, characterized in that: The material of the probe (3) is a nickel-based corrosion-resistant alloy, which is used to provide good corrosion resistance and thermal stability.

6. The non-contact infrared concentration measuring device according to claim 5, characterized in that: The gas channel (8) is a cylindrical channel made of transparent single-crystal calcium fluoride material and is used to provide a higher infrared transmittance.

7. The non-contact infrared concentration measuring device according to claim 6, characterized in that: The probe tube (3) and the lens frame (5) are fixedly connected via the fixing screw (4).

8. The non-contact infrared concentration measuring device according to claim 7, characterized in that: The emitting surface (9) is arranged on a side of the lens holder (5) close to the lens seat (7), and the reflecting surface (10) is arranged on a side of the lens seat (7).

9. The non-contact infrared concentration measuring device according to claim 8, characterized in that: One end of the lens seat (7) is telescopically and movably connected to one end of the lens frame (5) via a tough member, and the locking nut (6) is arranged outside the lens seat (7).

10. The non-contact infrared concentration measuring device according to claim 9, characterized in that: The outer wall surface of the mirror seat (7) is provided with a threaded structure adapted to the inner wall of the locking nut (6); the locking nut (6) is used to cooperate with the tough member to adjust and fix the distance between the emitting surface (9) and the reflecting surface (10).

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