CN218628823U - NECL parameter testing device of gas leak detector - Google Patents
NECL parameter testing device of gas leak detector Download PDFInfo
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- CN218628823U CN218628823U CN202223078337.3U CN202223078337U CN218628823U CN 218628823 U CN218628823 U CN 218628823U CN 202223078337 U CN202223078337 U CN 202223078337U CN 218628823 U CN218628823 U CN 218628823U
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Abstract
A gas leak detector NECL parameter testing device relates to infrared detection equipment and comprises a gas leak detector, a gas generation pool, a surface source black body, a vacuumizing device, an inflation body device, a pressure detection device and an image acquisition device. The utility model discloses the detection device of the test gas leak detector performance of building only needs control, collection and the calculation function through the host computer just can accomplish the detection of NECL parameter, need not the manual work and carries out complicated operation in earlier stage and the loaded down with trivial details calculation in later stage, and has improved the detection precision, has guaranteed the reliability of result.
Description
Technical Field
The invention relates to infrared detection equipment, in particular to a testing device of a gas leak detector.
Background
In recent years, products of refrigerating or non-refrigerating infrared focal plane gas leak detectors are increased year by year, but indexes such as MRTD and NETD of traditional thermal imagers cannot meet performance evaluation of gas leak detection systems.
At present, a double-air-chamber testing method is adopted for domestic detection, and the method has the following problems: (1) the double-air-chamber test system is not only extremely complex in construction and high in cost, but also can only stay in a laboratory stage, and is not suitable for industrial production detection. (2) According to the method, the nitrogen without infrared absorption is used for cleaning the air chamber before detection, and effective measurement cannot be carried out, so that the accuracy of an experimental result cannot be completely guaranteed.
Disclosure of Invention
The invention provides a testing device for NECL parameters of a gas leak detector, which solves the problem that the performance detection method for the gas leak detector is incomplete and non-uniform in China.
The device for testing the NECL parameters of the gas leak detector is characterized by consisting of the gas leak detector, a gas generating pool, a surface source black body, a vacuumizing device, an inflating body device, a pressure detection device and an image acquisition device; a gas leak detector to be detected is placed at one end of the gas generating pool, and a surface source black body is placed at the other end of the gas generating pool; the vacuumizing device, the gas filling device and the pressure detection device are connected with the gas generation pool;
the image acquisition device is provided with a Camerlink interface, and a VCE-CLEX02 type Camerlink acquisition card is arranged to be connected with the image interface of the gas leak detector;
the gas generating pool is a pressure-resistant double-waveband window single-gas chamber, the length of the gas chamber is 1m, the volume of the gas chamber is 25 liters, and double-waveband transmission germanium windows with the diameter of about 18cm are respectively embedded in the front panel and the rear panel.
The gas filled in the gas generating pool is methane and ethylene.
The gas leak detector NECL parameter testing device, the gas leak detector, the vacuumizing device, the gas filling device, the pressure detecting device and the image reading device are connected with a power supply through corresponding cables to supply power for the gas leak detector NECL parameter testing device, the gas leak detector, the vacuumizing device, the gas filling device, the pressure detecting device and the image reading device.
The vacuum-pumping device is composed of a molecular pump and a mechanical pump, the gas generating pool is connected with the molecular pump through a gas outlet, and the molecular pump is connected with the mechanical pump.
The inflatable body device is composed of a flow meter, a gas tank and a pressure relief valve, the gas generation pool is connected with the flow meter through the gas inlet, the flow meter is connected with the gas tank, and the pressure relief valve is arranged on the gas tank.
The pressure detection device is composed of an ionization gauge, a resistance gauge and a microcomputer type digital display composite vacuum gauge, and the ionization gauge and the resistance gauge are connected with the microcomputer type digital display composite vacuum gauge.
The detection device for testing the performance of the gas leak detector is low in construction cost and can be put into actual production detection. The problems that in the prior art, the cost is too high, the precision of a measuring result is low, the device only stays at a test stage and the like are solved, the device is put into practical production detection, the blank in the field is filled, and the economic development of related industries is promoted.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Detailed Description
Example 1: the device for testing the NECL parameters of the gas leak detector consists of an upper computer 1, a gas leak detector 2, a gas generation pool 3, a surface source black body 4, a mechanical pump 24, a molecular pump 14, a gas outlet 22, a pressure gauge 21, an ionization gauge 15, a resistance gauge 16, a microcomputer type digital display composite vacuum gauge 17, a gas tank 18, a pressure relief valve 19, a flow meter 20 and a gas inlet 23;
a gas leak detector 2 to be detected is placed at one end of the gas generating pool 3, and a surface source black body 4 is placed at the other end of the gas generating pool and used for simulating background temperature difference; the gas generating pool 3 is provided with a pressure gauge 21, an ionization gauge 15 and a resistance gauge 16, and is provided with a gas outlet 22 and a gas inlet 23;
the air outlet 22 is connected with the molecular pump 14, and the molecular pump 14 is connected with the mechanical pump 24;
the air inlet 23 is connected with a flowmeter 20, the flowmeter 20 is connected with an air tank 18, and a pressure relief valve 19 is arranged on the air tank 18;
the ionization gauge 15 and the resistance gauge 16 are connected with a microcomputer type digital display composite vacuum gauge 17; the ionization gauge 15 and the resistance gauge 16 are used for detecting the pressure in the gas generating cell 3;
the upper computer 1 is provided with a Camerlink interface, a VCE-CLEX02 type Camerlink acquisition card and a special cable are arranged, the Camerlink interface of the upper computer 1 is connected with an image interface of the gas leak detector 2, and the cable is connected with a power supply;
the gas generating pool 3 is a pressure-resistant double-waveband window single-gas chamber, the length of the gas chamber is 1m, the volume of the gas chamber is 25 liters, and a double-waveband transmission germanium window with the diameter of about 18cm is embedded in each of the front panel and the rear panel, so that the gas generating pool can transmit a middle-waveband frequency band of 3-5 um and a long-waveband frequency band of 8-12 um;
the molecular pump 14 is a model FF-100/150 molecular pump.
The using method of the detection device comprises the steps of image acquisition and preprocessing, image segmentation, image transfer function calculation, image noise calculation and NECL parameter calculation, and specifically comprises the following steps:
step 1, opening a mechanical pump 24 to pump the air pressure in the gas generation pool 3 to 20Pa displayed by a digital display vacuum gauge 17, starting a molecular pump 14, and pumping the air pressure in the gas generation pool 3 to below 1 Pa; the pumped gas exits the gas outlet 22;
step 4, opening the mechanical pump 24 and the molecular pump 14, vacuumizing the gas generation pool 3 again, injecting gases with the volumes of 700ml, 800ml, 1200ml and 1700ml in a time-by-time manner, repeating the step 2 and the step 3, and respectively collecting images and storing the images in the memory of the upper computer 1;
step 5, opening images under different gas volumes in MATLAB2015 software when the temperature difference of the collected black body is 3 ℃, and selecting and intercepting an image with a surface source black body as a background;
step 6, opening images under different gas volumes in MATLAB2015 software when the temperature difference of the collected black body is 0 ℃, and selecting and intercepting images in the range of the cavity of the gas generation pool;
step 7, calculating the Sitf parameter of the gas leak detector in MATLAB2015 software according to the intercepted image with the surface source black body as the background, wherein the Sitf parameter calculation formula is as follows:
(1) In the formula, N is the number of acquisition points, namely the number of acquired background images is 5, and according to the number of the acquisition points, the parameter value of a transfer function Sitf is directly calculated to be 0.136 by using the image processing function of MATLAB2015 software;
step 8, calculating the root mean square noise V of the image in MATLAB2015 software according to the intercepted image in the range of the cavity part of the gas generation pool rms Parameter, V rms The parameter calculation formula is as follows:
(2) N in the formula is the number of acquisition points, namely the number of images in the cavity range of the generation pool is 5, and according to the number of the acquisition points, the root mean square noise V of the images is directly calculated by using the image processing function of MATLAB2015 software rms The parameter value is 48.51;
step 9, according to Sitf and the root mean square noise V rms Calculating the corresponding NEC parameter value to be 356.76ppm; the calculation formula of the NEC parameter is as follows:
step 10, obtaining the NECL parameter value of the instrument as 178.38ppm/m through integration according to the length of the gas chamber of the gas generating cell 3, namely the length of the cavity body is 1 m; the calculation formula of the NECL parameter is as follows:
the temperature difference of the surface source black body refers to the temperature difference between the set surface source black body and the detection environment.
The gas filled in the gas generating pool 3 is methane, ethylene or low-density gas. While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes and modifications can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (5)
1. Gas leak detector NECL parameter test device which characterized in that:
the device consists of a gas leak detector, a gas generating pool, a surface source black body, a vacuumizing device, an inflating body device, a pressure detecting device and an image collecting device; a gas leak detector to be detected is placed at one end of the gas generating pool, and a surface source black body is placed at the other end of the gas generating pool; the vacuumizing device, the gas filling device and the pressure detection device are connected with the gas generation pool;
the image acquisition device is provided with a Camerlink interface, and a VCE-CLEX02 type Camerlink acquisition card is connected with the image interface of the gas leak detector;
the gas generating pool is a pressure-resistant double-waveband window single-gas chamber, the length of the gas chamber is 1m, the volume of the gas chamber is 25 liters, and double-waveband transmission germanium windows with the diameter of about 18cm are respectively embedded in the front panel and the rear panel.
2. The apparatus for testing NECL parameters of a gas leak detector as claimed in claim 1, wherein said image acquisition means has Framelink Express acquisition software, a Camerlink video acquisition card, and a storage device.
3. The NECL parametric testing device of claim 1, wherein the evacuating means is comprised of a molecular pump and a mechanical pump, the gas generating cell is connected to the molecular pump through a gas outlet, and the molecular pump is connected to the mechanical pump.
4. A gas leak detector NECL parametric test device as claimed in claim 1, wherein the gas filling means is constituted by a flow meter, a gas tank and a pressure relief valve, the gas generation cell is connected to the flow meter through a gas inlet, the flow meter is connected to the gas tank, and the pressure relief valve is provided on the gas tank.
5. A NECL parameter testing device of a gas leak detector according to claim 1, wherein the pressure detecting means is constituted by an ionization gauge, a resistance gauge and a microcomputer type digital display composite vacuum gauge, and the ionization gauge and the resistance gauge are connected to the microcomputer type digital display composite vacuum gauge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223078337.3U CN218628823U (en) | 2022-11-21 | 2022-11-21 | NECL parameter testing device of gas leak detector |
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| CN202223078337.3U CN218628823U (en) | 2022-11-21 | 2022-11-21 | NECL parameter testing device of gas leak detector |
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