A test calibration device for a linear beam detector

Abstract

A test calibration device for a linear beam detector includes: a gas chamber with openings at both ends in a first direction, the openings being spaced a first calibration distance apart; a first lens mounted on each opening to create a sealed cavity within the gas chamber; and a gas sampler connected to a gas chamber conduit for injecting a target gas into the gas chamber. With this structure, the target gas can be injected into the gas chamber via the gas sampler, achieving a predetermined integrated concentration. By positioning the transmitter and receiver of the linear beam detector at the openings at both ends of the gas chamber, the integrated concentration of the target gas within the first calibration distance can be detected. This allows for testing of the linear beam detector, including basic performance tests, alarm activation value tests, range indication deviation tests, and long-term stability tests, and enables calibration of the linear beam detector based on the test results.

Description

Technical Field

[0001] This invention relates to the field of combustible gas detection technology, and in particular to a test calibration device for a linear beam detector. Background Technology

[0002] According to the national standard GB15322.4-2019, linear beam combustible gas detectors that use the spectral absorption principle to detect flammable gases and vapors such as hydrocarbons, ethers, esters, and alcohols are tested for performance. The tests include basic performance tests, alarm activation value tests, range indication deviation tests, long-term stability tests, and light intensity attenuation tests. Currently, the performance testing and calibration of linear beam combustible gas detectors primarily employ theoretical calculation methods and large-space concentration ratio methods.

[0003] For the performance testing and calibration of linear beam combustible gas detectors, theoretical calculations cannot accurately reflect the measured gas concentration values, resulting in errors in actual measurements that are far greater than theoretical calculations. This can cause false alarms or failure to alarm, posing a threat to production safety.

[0004] Large-space concentration mixing methods require significant manpower and resources. For example, with a linear beam gas detector with an optical path of 100 meters, gas mixing experiments in this space require a large amount of standard gas and a considerable amount of waiting time. It is often difficult to conduct experiments with different gas concentrations in a large space, so it is not feasible to test the linear points of a linear beam gas detector separately.

[0005] Therefore, there is an urgent need for a test calibration device for linear beam detectors to improve measurement accuracy, reduce testing difficulty, and speed up testing in processes such as basic performance testing, alarm action value testing, range indication deviation testing, long-term stability testing, and light intensity attenuation testing. Summary of the Invention

[0006] In view of the above-mentioned problems of the prior art, this application provides a test calibration device for a linear beam detector, which can improve measurement accuracy, reduce testing difficulty, and speed up testing in processes such as basic performance testing, alarm action value testing, range indication deviation testing, long-term stability testing, and light intensity attenuation testing.

[0007] This application provides a test calibration device for a linear beam detector, comprising: a gas chamber, wherein openings are formed at both ends of the gas chamber in a first direction, the two ends of the openings are separated by a first calibration distance, and a first lens is disposed on the opening to form a sealed cavity inside the gas chamber; and a gas injector connected to the gas chamber pipeline for injecting target gas into the gas chamber.

[0008] Using the above structure, the target gas can be injected into the gas chamber using a gas injector, bringing the target gas in the chamber to a predetermined integrated concentration. The transmitting and receiving devices of the linear beam detector are respectively positioned at both ends of the gas chamber, at the opening, allowing for the detection of the integrated concentration of the target gas within a first calibration distance. This enables the linear beam detector to undergo basic performance tests, alarm activation value tests, range indication deviation tests, long-term stability tests, and other tests, and allows for calibration based on the test results.

[0009] In some embodiments, the first calibration distance is 1m.

[0010] By adopting the above structure and setting the first calibration distance to 1m, the calculation of the integral concentration of the target gas can be simplified. Furthermore, the volume of the gas chamber can be reduced, facilitating its installation and use.

[0011] In some embodiments, a stirring fan is also provided in the gas chamber.

[0012] With the above structure, the gas in the gas chamber can be stirred by a stirring fan, thereby making the concentration of the target gas in the gas chamber more uniform.

[0013] In some embodiments, the air chamber is further provided with a heater for heating the first lens.

[0014] With the above structure, the first lens can be heated by a heater, thereby preventing water vapor from condensing on the first lens and affecting the detection effect of the linear beam detector.

[0015] In some embodiments, at least one of the openings at both ends is detachably connected to a second lens, the second lens being a neutral density filter.

[0016] Using the above structure, when the linear beam detector detects the integrated concentration of the target gas in the gas chamber, the detection data can be compared by removing and installing a second lens on the opening, the difference in data before and after light intensity attenuation can be judged, the error of the linear beam detector can be calculated, and thus the light intensity attenuation experiment can be completed.

[0017] In some embodiments, the air chamber is provided with an air inlet and an air outlet.

[0018] With the above structure, air can be filled into the air chamber through the air inlet and the gas in the air chamber can be discharged through the air outlet, so as to prepare for the next test.

[0019] In some embodiments, the air inlet is provided with an air intake fan and an air intake solenoid valve, and the exhaust outlet is provided with an exhaust fan and an exhaust solenoid valve.

[0020] With the above structure, air can be automatically filled into the air chamber via an intake fan and an intake solenoid valve. Air can be automatically discharged from the air chamber via an exhaust fan and an exhaust solenoid valve. This simplifies operation for the user.

[0021] In some embodiments, the system further includes a gas analyzer connected to the gas chamber pipeline for detecting the concentration of the target gas in the gas chamber.

[0022] With the above structure, the concentration of the target gas in the gas chamber can be detected by a gas analyzer. Based on the concentration of the target gas in the gas chamber, the gas injector can be controlled to control the amount of target gas injected into the gas chamber.

[0023] In some embodiments, the system further includes a controller electrically connected to the gas injector and the gas analyzer.

[0024] With the above structure, the gas injector and gas analyzer can be controlled by the controller. The controller can detect the concentration of the target gas in the gas chamber in real time through the gas analyzer. The controller can automatically control the gas injector based on the detection data of the gas analyzer so that the integrated concentration of the target gas in the gas chamber reaches the set value.

[0025] In some embodiments, the device further includes an electric actuator, the air chamber being disposed on the electric actuator, the electric actuator being electrically connected to the controller, and driving the air chamber to rise or fall.

[0026] With the above structure, the air chamber can be raised or lowered by an electric push rod, thereby adjusting the height of the air chamber so that the openings at both ends of the air chamber are aligned with the transmitting and receiving devices of the linear beam detector.

[0027] These and other aspects of the invention will become more apparent from the following description of several embodiments. Attached Figure Description

[0028] The various features of the present invention and the relationships between them are further explained below with reference to the accompanying drawings. The drawings are exemplary; some features are not shown to scale, and some drawings may omit conventional features in the field of this application that are not essential to this application, or additional features that are not essential to this application may be shown. The combination of features shown in the drawings is not intended to limit the present application. Furthermore, throughout this specification, the same reference numerals refer to the same things. Specific descriptions of the drawings are as follows:

[0029] Figure 1A schematic diagram of the structure for testing a linear beam detector using the test calibration device of this application;

[0030] Figure 2 for Figure 1 Schematic diagram of the installation structure of the middle gas chamber;

[0031] Figure 3 for Figure 1 Schematic diagram of the middle air chamber;

[0032] Figure 4 for Figure 3 A diagram showing the disassembly of the middle lens.

[0033] Explanation of reference numerals in the attached figures

[0034] 10 Test calibration device; 100 Gas chamber; 110 Opening; 121 First lens; 122 Lens flange; 122a Insertion groove; 123 Rubber ring; 124 Heater; 125 Second lens; 130 Air inlet; 140 Air outlet; 150 Stirring fan; 160 Air inlet; 161 Air inlet fan; 162 Air inlet solenoid valve; 110; 170 Exhaust port; 171 Exhaust fan; 172 Exhaust solenoid valve; 200 Gas sampler; 300 Gas analyzer; 400 Controller; 500 Electric push rod; 21 Transmitting device; 22 Receiving device. Detailed Implementation

[0035] The terms "first, second, third, etc." or similar terms such as module A, module B, module C, etc., used in the specification and claims are only used to distinguish similar objects and do not represent a specific ordering of objects. It is understood that a specific order or sequence may be interchanged where permitted so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0036] The term "comprising" as used in the specification and claims should not be construed as limiting itself to what follows; it does not exclude other elements. Therefore, it should be interpreted as specifying the presence of the mentioned feature, integral, or component, but does not exclude the presence or addition of one or more other features, integrals, or components, or groups thereof. Thus, the statement "equipment comprising means A and B" should not be limited to an equipment consisting solely of components A and B.

[0037] The term "an embodiment" or "an embodiment" as used in this specification means that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in at least one embodiment of the invention. Therefore, the terms "in one embodiment" or "in an embodiment" appearing throughout this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. Furthermore, in one or more embodiments, the particular features, structures, or characteristics can be combined in any suitable manner, as will be apparent to those skilled in the art from this disclosure.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. In case of any inconsistency, the meaning set forth in this specification or derived from the content described herein shall prevail. Furthermore, the terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit the scope of this application.

[0039] In order to accurately describe the technical content of this application and to accurately understand the present invention, the following explanations or definitions of the terms used in this specification are given before describing the specific embodiments.

[0040] Optical path length, the propagation distance of the detection beam between the transmitting device 21 and the receiving device 22 (or the reflecting device).

[0041] Integral concentration is the mathematical integral of the concentration of combustible gas along the length of the optical path.

[0042] The concentration of combustible gas is expressed in LEL, the optical path length is expressed in m, and the integral concentration is expressed in LEL·m.

[0043] The specific structure of the test calibration device 10 for the linear beam detector in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0044] Figure 1 A schematic diagram of the structure for testing a linear beam detector using the test calibration device 10 of this application; Figure 2 for Figure 1 Schematic diagram of the installation structure of the middle gas chamber 100; Figure 3 for Figure 1 A schematic diagram of the structure of the middle air chamber 100. (See diagram below.) Figure 1 , Figure 2 , Figure 3As shown, the linear beam detector in this application includes at least a transmitting device 21 and a receiving device 22. The transmitting device 21 can emit a detection beam, and the receiving device 22 can receive the detection beam. The linear beam detector can detect the integral concentration of combustible gases (i.e., target gases) such as hydrocarbons, ethers, esters, and alcohols in the monitored area through the detection beam. When the integral concentration reaches the alarm set value, it can issue an alarm signal. When the linear beam detector is placed in a normal environment, it can automatically (or manually) return to the normal monitoring state within 30 seconds (i.e., deactivate the alarm and continue to detect the integral concentration of combustible gases).

[0045] like Figure 1 , Figure 2 , Figure 3 As shown, the test calibration apparatus 10 in this application includes a gas chamber 100 and a gas injection instrument 200. The gas chamber 100 can be, for example... Figure 3 The shape shown is cylindrical, but it can also be square or other suitable shapes; there are no limitations. The gas chamber 100 has openings 110 at both ends along its axial direction (i.e., the first direction), with a first calibrated distance between the two openings 110. A first lens 121 is mounted on each opening 110, creating a sealed cavity within the gas chamber 100. An air inlet 130 is provided on the outer circumferential surface of the gas chamber 100. The gas sampler 200 is connected to the air inlet 130 on the gas chamber 100 via a pipe for injecting combustible gas into the gas chamber 100. Combustible gas can be injected into the gas chamber 100 through the gas sampler 200 to achieve a predetermined integrated concentration. The combustible gas injected into the gas chamber 100 by the gas sampler 200 can be pure combustible gas, or, for example, 95%, 90%, 80%, or other concentrations higher than the predetermined concentration in the gas chamber 100; there are no limitations.

[0046] The transmitting device 21 and receiving device 22 of the linear beam detector are respectively positioned at both ends of the gas chamber 100, at the opening 110. The detection beam emitted by the transmitting device 21 passes through the first lens 121 of the opening 110 at both ends of the gas chamber 100 and is received by the receiving device 22, thereby enabling the detection of the integrated concentration of combustible gas within a first calibrated distance in the gas chamber 100. This allows for the conduction of basic performance tests, alarm action value tests, range indication deviation tests, long-term stability tests, and other tests on the linear beam detector. Furthermore, the linear beam detector can be calibrated based on the test results.

[0047] In addition, compared with the large-space proportioning method, which involves filling a large sealed room with combustible gas to conduct performance tests and calibrations on the linear beam detector, replacing the large sealed room with the gas chamber 100 can accelerate the time for the integrated concentration of combustible gas to reach the predetermined concentration and reduce the consumption of combustible gas.

[0048] Furthermore, the first calibration distance can be set to, for example, 1m, 2m, 5m, 10m, or other distances. This simplifies the calculation of the integrated concentration of combustible gas and reduces the difficulty of detection. Additionally, the volume of the gas chamber 100 can be reduced, allowing the concentration of combustible gas within the chamber 100 to quickly reach the predetermined integrated concentration, thus reducing the consumption of combustible gas. It also reduces the weight of the gas chamber 100, facilitating its installation and use.

[0049] Preferably, the first calibration distance is 1m, which can further simplify the calculation of the integral concentration of combustible gas and reduce the difficulty of detection.

[0050] like Figure 1 , Figure 2 , Figure 3 As shown, a stirring fan 150 is also provided inside the gas chamber 100. Two stirring fans 150 can be provided, respectively positioned near both ends of the gas chamber 100. The stirring fans 150 agitate the gas inside the gas chamber 100, thereby making the concentration of combustible gas within the gas chamber 100 more uniform.

[0051] Furthermore, the two stirring fans 150 can be respectively positioned at the inlet 130 and the outlet 140, thereby rapidly blowing the combustible gas entering the gas chamber 100 through the inlet 130 to other locations within the gas chamber 100, thereby increasing the rate at which the concentration of combustible gas within the gas chamber 100 is uniform. This also improves the uniformity of the gas concentration discharged through the outlet 140 within the gas chamber 100.

[0052] like Figure 3 As shown, the air chamber 100 is provided with an air inlet 160 and an air outlet 170. Air can be filled into the air chamber 100 through the air inlet 160, and the gas in the air chamber 100 can be discharged through the air outlet 170 in order to prepare for the next test.

[0053] like Figure 3 As shown, an intake fan 161 and an intake solenoid valve 162 are installed on the air inlet 160, and an exhaust fan 171 and an exhaust solenoid valve 172 are installed on the exhaust outlet 170. The intake fan 161 and the intake solenoid valve 162 can automatically fill the air chamber 100 with air. The exhaust fan 171 and the exhaust solenoid valve 172 can automatically exhaust the gas from the air chamber 100. This facilitates user operation.

[0054] Figure 4 for Figure 3 A disassembly diagram of the middle lens. (See diagram below.) Figures 1-4As shown, the first lens 121 can be, for example, a quartz lens. The first lens 121 is fitted onto the openings 110 at both ends of the air chamber 100 via a lens flange 122 and is fixed in place by screws. A rubber ring 123 is also provided on the first lens 121. After the first lens 121 is fixed, the rubber ring 123 can improve the sealing between the first lens 121 and the opening 110.

[0055] like Figure 4 As shown, a heater 124 is also provided on the gas chamber 100, which is used to heat the first lens 121. Specifically, the heater 124 is plate-shaped and disposed on the lens flange 122 to heat the lens flange 122, thereby heating the first lens 121. By heating the first lens 121, water vapor is prevented from condensing on the first lens 121, thus avoiding affecting the detection effect of the linear beam detector.

[0056] like Figure 4 As shown, at least one of the openings 110 at both ends is detachably connected to a second lens 125, which is a neutral density filter. Specifically, an insertion groove 122a is also provided on the surface of the lens flange 122 away from the opening 110. The insertion groove 122a extends circumferentially along the lens flange 122, forming a semi-circular structure. The second lens 125 can be inserted into the insertion groove 122a, so that the second lens 125 and the lens flange 122 are detachably connected. When the linear beam detector detects the integrated concentration of combustible gas in the gas chamber 100, by removing and installing the second lens 125 on the opening 110, the detection data can be compared, the difference in data before and after light intensity attenuation can be judged, the error of the linear beam detector can be calculated, and thus the light intensity attenuation experiment can be completed.

[0057] like Figure 1 As shown, the test calibration device 10 in this application also includes a gas analyzer 300, which is connected to the gas chamber 100 via a pipe and is used to detect the concentration of combustible gas in the gas chamber 100. Specifically, an outlet 140 is also provided on the outer peripheral surface of the gas chamber 100. The gas analyzer 300 can be connected to the inlet 130 and the outlet 140 via a pipe. Gas in the gas chamber 100 can enter the gas analyzer 300 through the outlet 140 and then return to the gas chamber 100 through the inlet 130, thereby enabling the gas analyzer 300 to detect the concentration of combustible gas in the gas chamber 100. Furthermore, based on the concentration of combustible gas in the gas chamber 100, the gas injector 200 can be controlled to control the amount of combustible gas injected into the gas chamber 100.

[0058] like Figure 1As shown, the test calibration device 10 in this application also includes a controller 400, which is electrically connected to the gas injector 200 and the gas analyzer 300. Therefore, the controller 400 can control the gas injector 200 and the gas analyzer 300. The controller 400 can detect the concentration of combustible gas in the gas chamber 100 in real time through the gas analyzer 300. The controller 400 can automatically control the gas injector 200 based on the detection data from the gas analyzer 300, so that the integrated concentration of combustible gas in the gas chamber 100 reaches the set value.

[0059] like Figure 1 As shown, the test calibration device 10 in this application also includes an electric push rod 500, which is vertically mounted on the controller 400. The air chamber 100 is mounted on the electric push rod 500, and the electric push rod 500 is electrically connected to the controller 400. Under the control of the controller 400, the air chamber 100 can be pushed up or down. The height of the air chamber 100 can be adjusted by pushing the air chamber 100 up or down through the electric push rod 500, so that the openings 110 at both ends of the air chamber 100 are aligned with the transmitting device 21 and the receiving device 22 of the linear beam detector.

[0060] Furthermore, the controller 400 is also electrically connected to the stirring fan 150, the intake fan 161, the intake solenoid valve 162, the exhaust fan 171, and the exhaust solenoid valve 172, and can control the rotation of the stirring fan 150, the intake fan 161, and the exhaust fan 171, as well as control the opening and closing of the intake solenoid valve 162 and the exhaust solenoid valve 172.

[0061] In summary, when using the test calibration device 10 of this application to test and calibrate the linear beam detector, the controller 400 can control the electric push rod 500 to adjust the height of the gas chamber 100, aligning the openings 110 at both ends of the gas chamber 100 with the transmitting device 21 and receiving device 22 of the linear beam detector. This allows the detection beam emitted by the transmitting device 21 to pass through the first lens 121 at both ends of the gas chamber 100 and illuminate the receiving device 22. The controller 400 sets a predetermined concentration of the combustion gas in the gas chamber 100. The controller 400 then controls the gas sampler 200 to inject combustible gas into the gas chamber 100 through the inlet nozzle 130. After the stirring fan 150 evenly mixes the gas in the gas chamber 100, the gas is fed into the gas analyzer 300 through the outlet nozzle 140. The gas analyzer 300 detects the concentration of the combustion gas in the gas, and then the gas is returned to the gas chamber 100 through the inlet nozzle 130. Therefore, the concentration of combustion gas in the gas chamber 100 can be detected in real time by the gas analyzer 300. The gas analyzer 300 can send the detection data to the controller 400, and the controller 400 controls the gas injector 200 according to the detection data. When the gas analyzer 300 detects that the concentration of combustion gas in the gas chamber 100 reaches the predetermined concentration, the controller 400 controls the gas injector 200 to stop injecting combustible gas into the gas chamber 100.

[0062] At this point, the linear beam detector can be activated to detect the integrated concentration of the combustion gas within the gas chamber 100. This allows for the conduct of basic performance tests, alarm activation value tests, range indication deviation tests, and long-term stability tests on the linear beam detector. Furthermore, the linear beam detector can be calibrated based on the test results.

[0063] By installing and removing the second lens 125 on the lens flange 122, the intensity attenuation of the detection beam emitted by the transmitting device 21 can be controlled. By comparing the previous data, the difference in data before and after intensity attenuation can be determined, the linear beam detector error can be calculated, and thus the intensity attenuation experiment can be completed.

[0064] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present application has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A test calibration device for a linear beam probe, characterized by, include: An air chamber has openings at both ends in a first direction, with a first calibrated distance of 1m between the openings. A first mirror is mounted on each opening to create a sealed cavity within the air chamber. An air inlet and an air outlet are located on the outer periphery of the air chamber. A stirring fan is also installed within the air chamber, positioned corresponding to the air inlet and outlet. An air inlet and an air outlet are provided on the air chamber; air is filled into the air chamber through the air inlet, and the air is discharged from the air chamber through the air outlet. A gas injector, which is connected to the inlet pipe, is used to inject the target gas into the gas chamber; A gas analyzer, which is connected to the inlet and outlet pipes, is used to detect the concentration of the target gas in the gas chamber; The controller is electrically connected to the gas injector and the gas analyzer; An electric push rod, wherein the air chamber is disposed on the electric push rod, and the electric push rod is electrically connected to the controller to push the air chamber to rise or fall; A heater is also provided on the air chamber, and the heater is used to heat the first lens; At least one of the openings at both ends is detachably connected to a second lens, which is a neutral density filter; The air chamber is provided with an air inlet and an air outlet; An intake fan and an intake solenoid valve are provided on the air inlet, and an exhaust fan and an exhaust solenoid valve are provided on the exhaust outlet. The first lens is fitted onto the openings at both ends of the air chamber via a lens flange and is fixed in place by screws. A rubber ring is also provided on the first lens. After the first lens is fixed, the rubber ring improves the sealing between the first lens and the opening. An insertion groove is also provided on the surface of the lens flange away from the opening. The insertion groove extends circumferentially along the lens flange to form a semi-circular structure. The second lens can be inserted into the insertion groove, so that the second lens and the lens flange can be detachably connected.

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