CN214066923U - Non-dispersive infrared long optical path measuring cell combined gas measuring system - Google Patents
Non-dispersive infrared long optical path measuring cell combined gas measuring system Download PDFInfo
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- CN214066923U CN214066923U CN202022924248.0U CN202022924248U CN214066923U CN 214066923 U CN214066923 U CN 214066923U CN 202022924248 U CN202022924248 U CN 202022924248U CN 214066923 U CN214066923 U CN 214066923U
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Abstract
The utility model belongs to low concentration gas measurement field relates to a non-dispersion infrared long optical path measuring cell allies oneself with uses and measures gas system, including non-dispersion infrared measuring device and long optical path measuring cell, its characterized in that: the light source of the non-dispersive infrared measuring device adopts a light source with a wide wavelength range, modulated radiation infrared light enters a multi-channel pyroelectric detector through a long optical path measuring cell, and narrow band filters with different wavelengths are arranged in front of the multi-channel pyroelectric detector; the long-optical-path measuring cell comprises three concave mirrors with the same curvature radius, and the propagation path of light rays is as follows: after entering the air chamber from the lower end of the concave mirror A, the light enters the long-optical-path measuring cell after being reflected for multiple times among A, B, C three concave mirrors. The utility model discloses simplify detection system greatly, reduced the system volume, the cost is reduced. The gas analyzer is suitable for high-precision measurement, effectively improves gas absorption, and provides a new mode for the application of high-sensitivity and selective gas detection.
Description
Technical Field
The utility model relates to Non-Dispersive InfraRed measurement technique (Non-Dispersive infra red, NDIR for short) and long optical path measuring cell (MPC) ally use and measure gas system belongs to low concentration gas measurement field.
Background
The non-dispersive infrared absorption method is called non-dispersive infrared method for short, and is one infrared absorption analysis method. The content of the substance is determined by utilizing the fact that the substance can absorb infrared radiation with specific wavelength to generate thermal effect change, and the change is converted into a measurable current signal. The operation is simple and quick. It is often used to analyze gaseous substances that have a strong absorption of infrared radiation, such as carbon monoxide, carbon dioxide, methane, ammonia, and the like. The non-dispersive infrared method for measuring carbon monoxide in air and total organic carbon in water is listed as a national standard analysis method.
Although the optical measurement method has the advantages of wide measurement range, high speed, high accuracy and precision and the like, the traditional method for optically measuring the polluted gas is only one-way light scattering and direct absorption, and is generally limited by the space size of an instrument, and the action distance between light and a sample is short, so that the measurement sensitivity is low. However, the concentration of the polluted gas is a trace amount, so that the small-sized single-optical-path detection means is not suitable for measuring the air pollution component.
Therefore, long optical path techniques using multiple reflections are required to solve this problem. In addition, with the development of gas measurement technology, the requirements of many fields on measuring instruments are higher and higher, and the portable gas measuring instrument is portable, miniaturized and integrated, and becomes the main development trend at present. Multiple reflections are achieved within a limited volume by an optically long optical path absorption cell, which can be portable and miniaturized. According to the Lambert-beer law, the transmitted light intensity and the effective optical path form positive correlation, and the most direct, simplest and obvious method for improving the detection sensitivity is to increase the effective optical path.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a non-dispersion infrared long optical path measuring cell allies oneself with uses the gas measurement system to above-mentioned situation, realizes the low concentration monitoring to the harmful gas that industrial environment produced.
The utility model discloses a main technical scheme: non-dispersive infrared long optical path measuring cell allies oneself with uses and measures gaseous system, including non-dispersive infrared measuring device and long optical path measuring cell, its characterized in that: the light source of the non-dispersive infrared measuring device adopts a light source with a wide wavelength range, modulated radiation infrared light enters a multi-channel pyroelectric detector through a long optical path measuring cell, and narrow band filters with different wavelengths are arranged in front of the multi-channel pyroelectric detector; the long-optical-path measuring cell comprises three concave mirrors with the same curvature radius, and the propagation path of light rays is as follows: after entering the air chamber from the lower end of the concave mirror A, the light enters the long-optical-path measuring cell after being reflected for multiple times among A, B, C three concave mirrors.
Preferably, the multi-channel pyroelectric detector comprises a bolometric couple or thermopile detector made with a temperature difference point effect, a bolometric resistance detector supported with sensitivity of the body resistance to temperature, a pyroelectric detector based on the pyroelectric effect of pyroelectric crystals.
Preferably, the physical base length of the long-optical-path measuring cell is 16cm, and the effective optical path is 5 m after light is reflected back and forth for 8 times by the three concave mirrors.
The utility model discloses non-dispersion infrared measuring device in the system adopts the light source of wide wavelength scope, before using the narrowband optical filter to place the detector, through contrast detected signal and reference signal, thereby reachs by what infrared light absorbed by the gas under test and reachs concentration. Meanwhile, the narrow-band filters with different wavelengths can be used for measuring multi-component gas, so that the cost of the device is greatly saved.
The utility model discloses long optical path measuring cell in the system changes the reflection number of times of light through the angle that changes the incident light according to basic optics principle, and then increases the propagation distance of light. By adjusting the installation position of the reflector and selecting a proper curvature radius, the effective total optical path of the measuring cell can be from several meters to dozens of meters, the gas detection with weak absorption strength can be completed, and the measuring cell can also be used for detecting low-concentration gas. The detection system is greatly simplified, the system volume is reduced, and the cost is reduced.
The utility model discloses the detector of heat effect principle that the electric detector is released to multichannel in the system is based on the ray radiation effect, mainly including the bolometric couple or the thermopile detector that utilize the temperature difference point utility to make, utilize the bolometric resistance detector that the object bulk resistance supports to the sensitivity of temperature, use the pyroelectric effect of the heat of thermoelectric crystal to release the electric detector for the heat that is based on. The gas analyzer has the characteristics of wide wavelength response range, higher detection precision and fast reaction, has fast response speed, small temperature response coefficient compared with a thermopile detector, realizes high scanning, and is suitable for high-precision measurement.
The utility model relates to a non-dispersive infrared long optical path measuring cell allies oneself with uses the gas measurement system, utilizes the long optical path measuring cell of non-dispersive infrared flue gas measuring device cooperation, realizes the low concentration monitoring to the harmful gas that industrial environment produced. The portable type miniature ultrasonic instrument has the advantages of simple structure, clear principle, incomparable volume, power consumption, performance and price, and can be portable and miniaturized. According to the Lambert-beer law, the transmitted light intensity and the effective optical path form positive correlation, and the most direct, simplest and obvious method for improving the detection sensitivity is to increase the effective optical path. Effectively improving gas absorption, which provides a new way for applications with high sensitivity and selectivity for gas detection.
Drawings
Fig. 1 is a light path diagram of a long optical path measuring cell in the embodiment of the present invention.
Fig. 2 is a schematic connection diagram of a system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following embodiments and drawings.
Examples
A non-dispersive infrared long-optical-path measuring cell combined gas measuring system is shown in attached figure 1 and mainly comprises a non-dispersive infrared measuring device and a long-optical-path measuring cell, wherein a light source of a wide wavelength range is adopted as a light source of the non-dispersive infrared measuring device, modulated radiation infrared light enters a multi-channel pyroelectric detector through the long-optical-path measuring cell, and narrow-band filters with different wavelengths are arranged in front of the multi-channel pyroelectric detector.
In an embodiment, referring to fig. 2, the long-path measuring cell includes three concave mirrors with the same radius of curvature, and the propagation path of the light is as follows: after entering the air chamber from the lower end of the concave mirror A, the light enters the long-optical-path measuring cell after being reflected for multiple times among A, B, C three concave mirrors. In the embodiment, the physical base length of the long-optical-path measuring cell is 16cm, and after light is reflected back and forth for 8 times by the three concave mirrors, the effective optical path can reach 5 m.
In embodiments, the multi-channel pyroelectric detector includes a bolometric couple or thermopile detector fabricated using a temperature difference point effect, a bolometric resistance detector supported using sensitivity of body resistance to temperature, a pyroelectric detector based on the pyroelectric effect of a pyroelectric crystal.
The non-dispersive infrared long optical path measuring cell combined gas measuring system utilizes the non-dispersive infrared smoke measuring device to be matched with the long optical path measuring cell, and realizes low concentration monitoring of harmful gases generated in industrial environment. The structure is simple, the principle is simple, and the operation is convenient.
The above description is only an example of the present invention, and is not intended to limit the present invention. The utility model discloses can have various suitable changes and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. Non-dispersive infrared long optical path measuring cell allies oneself with uses and measures gaseous system, including non-dispersive infrared measuring device and long optical path measuring cell, its characterized in that: the light source of the non-dispersive infrared measuring device adopts a light source with a wide wavelength range, modulated radiation infrared light enters a multi-channel pyroelectric detector through a long optical path measuring cell, and narrow band filters with different wavelengths are arranged in front of the multi-channel pyroelectric detector; the long-optical-path measuring cell comprises three concave mirrors with the same curvature radius, and the propagation path of light rays is as follows: after entering the air chamber from the lower end of the concave mirror A, the light enters the long-optical-path measuring cell after being reflected for multiple times among A, B, C three concave mirrors.
2. The non-dispersive infrared long optical path measurement cell in combination with a measurement gas system according to claim 1, wherein the multi-channel pyroelectric detector comprises a bolometric thermocouple or thermopile detector made using a temperature difference point effect, a bolometric thermistor detector supported using sensitivity of body resistance to temperature, a pyroelectric detector based on pyroelectric effect of pyroelectric crystal.
3. The non-dispersive infrared long optical path measurement cell combination measurement gas system according to claim 1, wherein the physical base length of the long optical path measurement cell is 16cm, and the effective optical path is 5 m after light is reflected back and forth 8 times by three concave mirrors.
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| CN202022924248.0U CN214066923U (en) | 2020-12-09 | 2020-12-09 | Non-dispersive infrared long optical path measuring cell combined gas measuring system |
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| CN202022924248.0U CN214066923U (en) | 2020-12-09 | 2020-12-09 | Non-dispersive infrared long optical path measuring cell combined gas measuring system |
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