CN219266086U

CN219266086U - On-line gas analyzer, absorption spectroscopy analyzer, and fluorescence spectroscopy analyzer

Info

Publication number: CN219266086U
Application number: CN202220914135.9U
Authority: CN
Inventors: 田玉成
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2023-06-27
Anticipated expiration: 2032-04-20

Abstract

The on-line gas analysis device, the absorption spectrometry analysis device and the fluorescence spectrometry analysis device comprise a light source, a light processing device, a light cutting device, a detector, a detection chamber and a reference light path; the light source is provided with a light processing device on an emitting light path, the light is divided into two paths by the light processing device, one path is a reference light path, and the other path is a light to be detected passing through the detection chamber; the light to be detected, which is output by the reference light path and the detection chamber, enters the same detector; and a light cutting device is arranged on the light to be detected and the reference light path. The utility model solves the technical problems of poor measuring effect and large calibration and maintenance workload caused by using two detectors in the prior art through the structure, and provides the online gas analysis device with good using effect and low maintenance cost.

Description

On-line gas analyzer, absorption spectroscopy analyzer, and fluorescence spectroscopy analyzer

Technical Field

The utility model belongs to the field of gas detection, and particularly relates to an online gas analysis device, an absorption spectrometry analysis device and a fluorescence spectrometry analysis device.

Background

The on-line gas analyzer is used for continuously and on-line detecting the content of some specific components in gas, and the accuracy is usually ppm-ppb, namely parts per billion, and is applied to scientific research, production, environmental protection and other aspects, and belongs to precise instruments, because the concentration of the components to be detected in the gas is very low, some instruments analyze by measuring the absorption spectrum or fluorescence spectrum of the gas, and the basic principle is that: the light emitted by the light source enters the detection chamber after being processed, the gas to be detected in the detection chamber can act with the light, fluorescent light with specific wavelength can be generated or light with specific wavelength can be absorbed according to different components, and the light spectrum emitted by the light source or the light spectrum after absorption can be measured by one detector, so that the specific component in the gas to be detected can be detected and analyzed. In practical use, the light source and its driving and controlling circuits will change with the increase of the service time and the external interference, so that the light intensity emitted by the light source will change, and in order to solve this problem, the current common practice is to add a reference light path and a reference detector, but the results of the two detectors will drift during the use, and regular calibration is needed, thus increasing the maintenance workload and maintenance cost.

Disclosure of Invention

In order to solve the above problems, the present utility model provides an on-line gas analysis device, an absorption spectroscopy analysis device, and a fluorescence spectroscopy analysis device, wherein a light cutting device is added to enable light passing through a reference light path and generated fluorescence or absorption light passing through a detection chamber to alternately pass through a main detector, and the reference detector is not used any more, so that drift of an instrument measurement result generated by inconsistent drift trend and amplitude of the main detector and the reference detector in a common design is eliminated, thereby greatly reducing the drift degree of the instrument, reducing the workload of operation and maintenance, and reducing cost expenditure.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the on-line gas analysis device comprises a light source, a light processing device, a light cutting device, a detector, a detection chamber and a reference light path; the light source is provided with a light processing device on an emitting light path, the light is divided into two paths by the light processing device, one path is a reference light path, and the other path is a light to be detected passing through the detection chamber; the light to be detected, which is output by the reference light path and the detection chamber, enters the same detector; the detector is provided with a light cutting device in front.

The device comprises an absorption spectrum analysis device of the online gas analysis device, wherein the light to be detected is injected into a light cutting device through a beam splitter and a detection chamber, and the detection chamber comprises a stainless steel tube; the reference light path is shot into the light cutting device through the beam splitter and the reflector, and a detector is arranged on an output light path of the light cutting device; the light source, the light processing device, the beam splitter, the reflector and the light cutting device are all arranged in the light source and the light path processing module.

The detection chamber consists of two stainless steel pipes and a light reflecting module, one end of each stainless steel pipe is inserted into the light source and light path processing module, the other end of each stainless steel pipe is connected with the light reflecting module, two corner reflectors are arranged in the light reflecting module, and the two corner reflectors are respectively arranged at the other ends of the two stainless steel pipes; the light passes through the first stainless steel tube, the reflector of the first face angle, the corner reflector of the second face and the second stainless steel tube in sequence.

The light source, the light path processing module and the light reflecting module are arranged on the base.

The fluorescence spectrometry analysis device comprises the online gas analysis device, wherein the output light of the light processing device is divided into a reference light path and a light to be detected through the light cutting device; the light to be detected enters the detection chamber through the shaping device and the lens II in sequence, the detection chamber is filled with gas to be detected, and a light filtering device II and a light transmitting mirror III are arranged on an output light path of the detection chamber.

The end part of the detection chamber is provided with an optical trap.

The light processing device comprises a light filtering device I and a lens I.

The light source is arranged on the base.

The beneficial effects of the utility model are as follows:

the utility model greatly increases the stability of the measuring result of the device, greatly reduces the drift of the device, reduces the maintenance workload and the maintenance cost, and provides a scientific and reasonable device for environmental protection, scientific research, production and other applications.

Drawings

FIG. 1 is a block diagram of the present utility model;

FIG. 2 is a perspective view of an absorption spectroscopy gas analysis apparatus;

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a cross-sectional view of FIG. 3;

FIG. 5 is a perspective view of a fluorescence spectroscopy gas analysis apparatus;

FIG. 6 is a cross-sectional view of FIG. 5;

fig. 7 is a partial enlarged view of fig. 6.

Fig. 8 is a schematic diagram of a prior art structure.

Description of the embodiments

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the conventional mechanism, as shown in fig. 8, in the above-mentioned structure, after the light emitted from the light source 1 is processed by filtering, shaping, collimation, beam splitting and the like of the light processing device 2, the light is respectively injected into the reference light path 3 and the detection chamber 5, the fluorescence spectrum or the absorption spectrum of the light is respectively detected by the reference detector 5-1 and the main detector 5-2, and the signal of the reference detector 5-1 is compared with the detection signal of the main detector 5-2, so that the influence of the fluctuation of the light intensity of the lamp on the detection result is eliminated.

The above structure is adopted by most online gas analyzers for measuring fluorescence spectrum or absorption spectrum, but in practical use, because the online gas analyzers continuously work for a long time, the two detectors and related signal processing and amplifying circuits thereof change with time, and the change trend and amplitude of the reference detector 5-1 and the main detector 5-2 are not consistent, the measurement result of the instrument still drifts. Since the instrument is required to continuously run on line 24 hours a day for 365 days a year, the first problem faced is that the zero point reference and the punctuation point reference of the instrument change along with the increase of the running time, thereby affecting the measurement result of the instrument, the technical specifications and requirements of periodic zero point calibration and punctuation point calibration are usually regulated for the instrument in the relevant national standard, and in actual work, the maintenance workload is greatly increased, and the cost is increased.

The utility model is an on-line gas analysis device as shown in FIG. 1. The light source 1 comprises a light source and a power supply driving and controlling circuit thereof, the light processing device 2 comprises devices for filtering, beam splitting, shaping, collimation, coupling and the like of light emitted by the light source, the light cutting device 4 refers to a device for selectively shielding, beam splitting and the like of the light; the detector 5 is used for detecting light intensity, and the detection chamber 6 is used for allowing the processed light to pass through and generating fluorescence or absorption spectrum with the gas to be detected in the light; the reference optical path 3 refers to an optical path through which part of light generated by the light source passes and can finally enter the detector 5 to be detected by the detector 5 by specific means such as reflection and/or beam splitting and/or coupling, and is used for comparing and compensating with fluorescence or absorption spectrum generated by the detection chamber 6.

The device is generally suitable for on-line analysis by adopting a fluorescence spectrometry or an absorption spectrometry, and in actual operation, the fluorescence spectrometry and/or the absorption spectrometry can be determined according to the specific gas component to be detected, a light source, working conditions and the like. When the device works, the light source 1 sends out light with relatively stable light intensity through the power supply, driving and control circuit, the light is subjected to shaping, filtering, collimation, beam splitting and other treatments by the optical processing device 2, so as to obtain light corresponding to a specific gas component to be detected and a detection method, and the light enters the reference light path 3 and the detection chamber 6 respectively; wherein the reference light path 3 usually contains no or only very low concentrations of the specific gas component to be detected, ensuring that the light is essentially undisturbed by it, and is injected into the detector 5 via the light-cutting means 4; the detection chamber 6 is filled with a gas to be detected, and after the incident light passes through the gas, the incident light can act on a specific component to be detected in the gas to be detected, and according to the difference of the specific component to be detected, the analysis can be performed by adopting a fluorescence method and/or an absorption spectrometry. When fluorescence detection is performed, a specific gas component to be detected can react with incident light, absorb photons with relatively short wavelength, and release light with relatively long wavelength, namely fluorescence: when the absorption spectrometry is carried out, the specific gas component to be detected absorbs the light with specific wavelength in the incident light, so that the light intensity is weakened, and an absorption spectrum is generated; the light cutting device 4 is positioned in front of the detector 5, so that the reference light passing through the reference light path 3 and the fluorescence or absorption light generated by the detection chamber 6 alternately enter the detector 5, thereby alternately generating reference light signals and detection light signals, and then comparing the two signals, thereby basically eliminating errors generated by fluctuation of a lamp, drift of the detector and circuit drift, greatly improving the stability of an analysis result, reducing the drift of the device, reducing the maintenance workload and the maintenance cost, and providing a scientific and reasonable device for scientific research, environmental protection and production.

The absorption spectrum ozone analyzer and the fluorescence spectrum sulfur dioxide gas analyzer comprising the above structure are briefly described as follows:

as shown in fig. 2-4, the device adopts an absorption spectrum method to analyze and detect the concentration of ozone, and the whole device is integrally arranged on a base 9, and a reflecting module 12, a light source and light path processing module 10, a detection chamber 6 and a detector 5 are arranged outside, wherein the detection chamber 6 consists of two stainless steel pipes 13, and the two steel pipes are selected because the absorbance of gas is in direct proportion to the light path according to lambert's law, and the device is put into an instrument case in actual use and cannot make the light path long enough due to the limitation of the volume of the instrument, so that the light path is lengthened by adopting the method to obtain a larger light absorbance signal, and the precision and resolution of the analysis device are increased; if the resolution of the device is low, or the space of the specific use environment is not limited, a single pipeline can be directly adopted, or one pipeline is used as a detection chamber, and the other pipeline is used as a reference light path. It should be noted that the design of the present device is merely one design scheme adopted according to the design requirement of the practical apparatus, and some other similar optical path schemes, such as increasing the number of pipelines, using a long optical path cell to increase the number of reflections, using an integrating sphere or other devices to increase the optical path, remain within the scope of protection of the present patent. Inside the reflector module 2 there are two symmetrically arranged corner reflectors 11, which function to allow light to pass sequentially through two stainless steel tubes 13 constituting the detection chamber 6. The light source and light path processing module 10 is internally provided with the light source and a power supply, driving and control circuit thereof, so that the light source emits light with relatively stable light intensity, the optical processing device 2 mainly has the functions of filtering and shaping, and the ozone generally has an absorption peak near 254nm, so that the light emitted by the light source 5 passes through the optical processing device 2 after being processed by the optical processing device 2, the light with the wavelength near 254nm can finally enter the detection chamber 6, and the light with other wavelengths is basically blocked; the beam splitter 7 splits the processed light into two paths, one path of light enters the detection chamber 6 through the beam splitter, passes through two stainless steel pipes and finally irradiates the detector 5; the other path of the light enters the reference light path downwards in the figure through the reflection of the beam splitter, changes the direction after being reflected by the reflector 8 and finally shoots to the detector 6; a light cutting device 4 is arranged in front of a light incidence window of the detector 6 and is used for alternately shielding light passing through the detection chamber 6 and reference light reflected by the reflector 8, so that the light alternately enters the detector and generates corresponding detection signals and reference signals, and the detection signals and the reference signals are amplified and processed by a subsequent circuit to finally obtain the concentration of ozone; here, the reference signal may also be used as the light intensity signal of the light source 1 itself to control and modulate the same, depending on the design of the subsequent analog and digital circuit processing; by the structure, errors caused by fluctuation of the light source 1, drift and interference of the detector 5 and a subsequent analog signal processing and amplifying circuit are basically eliminated, and stability of the whole device and accuracy of detection results are greatly improved.

As shown in fig. 5 to 7, the structure and the explanation of the analyzer for measuring sulfur dioxide concentration by fluorescence spectrometry are as follows:

the light source 1 is arranged on the base 2, is modulated by a power supply, driving and control circuit on the base 2, emits light with relatively stable light intensity, and passes through the filter device I2-1 and the lens I2-2 after preliminary shaping, wherein light with the wave band of 200-230 nm is transmitted, and light with other wave bands is basically blocked; the light passes through the light cutting device 4, so that the light alternately enters the reference light path 3 and exits through the small hole in the middle of the shaping device 14. It should be noted that, in this example, the incident light of the light source 1 is directly divided into two parts, and the light generated by the light source 1 can be divided into two beams by adding a beam splitting device according to the different actually selected light sources and the different physical parameters of the selected lenses, wherein one beam enters the reference light path 3, and the other beam enters the detection chamber after post-processing. The light entering the reference light path 3 can be directly detected by the detector 5 to generate a reference signal, the outgoing light passing through the small hole in the middle of the shaping device 14 enters the detection chamber 6 after being shaped by the lens II15, the detection chamber 6 is filled with the gas to be detected, sulfur dioxide and the incident light generate fluorescence, the photons of the incident light are absorbed, fluorescence with longer wavelength compared with the incident light is generated, the fluorescence basically removes the light with a non-fluorescence wave band through the filtering device 17 and enters the detector 5 after passing through the lens III18 to generate a detection signal, and the signal is compared and processed with the reference signal, so that the drift and interference of the light source 1 and the drift and interference generated by the detector 5 and the subsequent signal processing amplifying circuit can be basically removed, the detection precision is greatly improved, the drift of the measurement result of the whole analysis device is reduced, the stability is improved, the maintenance workload is greatly reduced, and the maintenance cost is reduced. The optical trap 16 is arranged in the analysis device in practical design, and is used for resolving and weakening redundant incident light after reacting with sulfur dioxide, so that the incident light entering the detector 5 is reduced as far as possible, stray light signals are reduced, the signals generated in the detector 5 correspond to fluorescence emitted by sulfur dioxide to the greatest extent at the moment, and the detection result is more accurate.

Claims

1. An on-line gas analysis device, characterized in that: the light source device comprises a light source (1), a light processing device (2), a light cutting device (4), a detector (5), a detection chamber (6) and a reference light path (3); a light processing device (2) is arranged on the light emitting path of the light source (1), the light is divided into two paths by the light processing device (2), one path is a reference light path (3), and the other path is the light to be detected passing through the detection chamber (6); the light to be detected which is output by the reference light path (3) and the detection chamber (6) enters the same detector (5); and a light cutting device (4) is arranged on the light to be detected and the reference light path (3).

2. An absorption spectroscopy analysis device, characterized in that: the device comprises an online gas analysis device, wherein light to be detected is injected into a light cutting device (4) through a beam splitter (7) and a detection chamber (6), and the detection chamber (6) comprises a stainless steel tube (13); the reference light path (3) is shot into the light cutting device (4) through the beam splitter (7) and the reflector (8), and a detector (5) is arranged on the output light path of the light cutting device (4); the light source (1), the light processing device (2), the beam splitter (7), the reflector (8) and the light cutting device (4) are arranged in the light source and light path processing module (10).

3. The absorption spectroscopy analysis apparatus according to claim 2, wherein: the detection chamber (6) consists of two stainless steel pipes (13) and a light reflecting module (12), one end of each stainless steel pipe (13) is inserted into the light source and light path processing module (10), the other end of each stainless steel pipe is connected with the light reflecting module (12), two corner reflectors are arranged inside each light reflecting module (12), and the two corner reflectors are respectively arranged at the other ends of the two stainless steel pipes (13); the light sequentially passes through a first stainless steel tube (13), a first surface angle reflector (11), a second surface angle reflector (11) and a second stainless steel tube (13).

4. The absorption spectroscopy analysis apparatus according to claim 2, wherein: the light source and light path processing module (10) and the light reflecting module (12) are arranged on the base (9).

5. A fluorescence spectroscopy analysis device, characterized in that: the device comprises an online gas analysis device, wherein the output light of the light processing device (2) is divided into a reference light path (3) and light to be detected through a light cutting device (4); the light to be detected sequentially passes through the shaping device (14) and the lens II (15) to enter the detection chamber (6), the detection chamber (6) is filled with gas to be detected, and a light filtering device II (17) and a light-transmitting mirror III (18) are arranged on an output light path of the detection chamber (6).

6. The fluorescence spectroscopy analysis device according to claim 5, wherein: the end part of the detection chamber (6) is provided with an optical trap (16).

7. The fluorescence spectroscopy analysis device according to claim 5, wherein: the light processing device (2) comprises a filtering device I (2-1) and a lens I (2-2).