CN115541123A - System and method for testing NECL parameters of gas leak detector - Google Patents
System and method for testing NECL parameters of gas leak detector Download PDFInfo
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Abstract
A system and a method for testing NECL parameters of a gas leak detector relate to infrared detection equipment, in particular to a testing method of the gas leak detector. The system consists of 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 testing method of the detection system comprises the steps of image acquisition and preprocessing, image segmentation, image transfer function calculation, image noise calculation and NECL parameter calculation. The built detection system for testing the performance of the gas leak detector can complete the detection of the NECL parameters only through the control, acquisition and calculation functions of the upper computer, does not need to manually perform complex operation in the early stage and complex calculation in the later stage, improves the detection precision, and ensures the reliability of results.
Description
Technical Field
The invention relates to infrared detection equipment, in particular to a test method of a gas leak detector.
Background
In recent years, products of refrigerated or non-refrigerated infrared focal plane gas leak detectors are increased year by year, but indexes such as MRTD and NETD for evaluating a traditional thermal imager cannot meet the performance evaluation of a gas leak detection system.
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. (3) When the NECL is calculated, the process is too complex, and the production efficiency is influenced if the NECL is actually applied to production. The NECL is a noise equivalent concentration length parameter of the gas leak detector, and is an index for judging the detection and identification sensitivity of the product. (4) When the gas to be measured is measured, a quantitative measurement is not performed on the gas injected into the cavity, which also affects the subsequent detection result.
Disclosure of Invention
The invention provides a system and a method for testing NECL parameters of a gas leak detector, which solve the problem that the performance detection method for the gas leak detector in China is incomplete and non-uniform.
The method for testing the NECL parameters of the gas leak detector is characterized in that:
the system adopted by the method consists of a gas leak detector, a gas generation pool, a surface source black body, a vacuumizing device, an inflatable 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 a double-waveband transmission germanium window with the diameter of 18cm is respectively embedded in the front panel and the rear panel;
the testing method of the detection system comprises the steps of image acquisition and preprocessing, image segmentation, image transfer function calculation, image noise calculation and NECL parameter calculation, wherein:
s1: the image acquisition and preprocessing steps comprise:
s1-1: pumping the air pressure in the gas generation tank to below 1Pa by using a vacuum pumping device;
s1-2: setting the temperature difference of the surface source black body to be any one temperature of-1-3 ℃, then injecting 500-2000ml of low-density gas into the gas generation pool for the first time by the gas filling device, closing the gas valve, and collecting and storing images by using an image reading device after the gas is uniform and stable for 1-3 min;
s1-3: setting the temperature difference of the surface source black body to be 0 ℃, and collecting and storing images by using image reading equipment;
s1-4: vacuumizing the gas generating pool again, injecting gas with a volume different from the first filling volume again, wherein the number of refilling times is at least two, and the volume of the gas is any one volume between 500 and 2000 ml; respectively acquiring and storing images under different volumes and the temperature difference of the two surface source black bodies;
s2: an image segmentation step, which specifically comprises the following steps:
opening all images acquired in the image acquisition and preprocessing process in MATLAB2015 software, and selecting and intercepting images taking a surface source black body as a background and images in the cavity range of the gas generation pool;
s3: the image transfer function calculating step specifically comprises the following steps:
calculating an image transfer function SiTF of the gas leak detector in MATLAB2015 software by using the intercepted image with the surface source black body as the background, wherein the calculation formula of the SiTF is as follows:
SiTF =
（1）；
(1) In the formula, N is the number of the acquisition points, namely the number of the acquired images with the surface source black body as the background;
d
outputting a differential network temperature signal for the differential blackbody;
s4: the image noise calculation step specifically comprises the following steps:
calculating the image of the intercepted gas generating cell cavity portion in MATLAB2015 softwareRoot mean square noise V rms Parameter, V rms The parameter calculation formula is as follows:
V rms =
（2）；
(2) N in the formula is the number of acquisition points, namely the number of images in the cavity of the generation pool;
s5: the calculation steps of the NECL parameters specifically comprise:
based on SiTF and RMS noise V rms Calculating a corresponding NEC parameter value, and then calculating a NECL parameter value;
the calculation formula of the NEC parameters is as follows:
NEC=
（3）；
the calculation formula of the NECL parameter is as follows:
NECL=
×xdx (4)。
the image reading device is provided with Framelink Express acquisition software, a Camerlink video acquisition card and a storage device.
The low density gas is methane or ethylene.
The gas leak detector NECL parameter testing system, 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 use of the gas leak detector NECL parameter testing system.
The vacuum pumping device is composed of a molecular pump and a mechanical pump, the gas generation 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 built detection system for testing the performance of the gas leak detector can complete the detection of the NECL parameters only through the control, acquisition and calculation functions of the upper computer, does not need to manually perform complex operation in the early stage and complex calculation in the later stage, improves the detection precision, and ensures the reliability of results. The system not only solves the problems that the cost is too high, the precision of the measuring result is low, and the system only stays at the test stage in the prior art, but also is put into practical production detection, fills the blank in the field, and promotes the economic development of related industries. The system provided by the invention is low in construction cost and can be put into actual production detection. Compared with the domestic prior detection method, the gas generation pool is vacuumized by the vacuum pump before measurement, so that the subsequent measurement precision is ensured. The injected gas to be measured is quantitatively measured, so that the measurement precision is improved, and the reliability of the result is ensured. The manual detection is simple in operation, and the detection of the production line can be started only by simple training. The production quality and performance of the gas leak detector product are ensured.
Drawings
FIG. 1 is a flow chart of the testing method of the present invention.
FIG. 2 is a schematic diagram of the system of the present invention.
Fig. 3 is an image with a plane source black body as a background.
FIG. 4 is an image taken of the gas generating cell cavity.
Detailed Description
Example 1: the performance NECL parameter is detected for a gas leak detector produced by a certain company.
The adopted detection system 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 flowmeter 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 flow meter 20, the flow meter 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 double wavebands with the diameter of about 18cm are respectively embedded in the front panel and the rear panel and penetrate through germanium windows, so that the gas generating pool can penetrate through medium wave bands of 3-5um and long wave bands of 8-12um;
the molecular pump 14 is a model FF-100/150 molecular pump.
The testing method of the detection system 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 extracted gas exits through the gas outlet 22;
step 3, setting the temperature difference of the surface source black body 4 to be 0 ℃, using Framelink Express acquisition software installed on the upper computer 1, acquiring images through a Camerlink video acquisition card, and storing the images in the memory of the upper computer 1;
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 dividing 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 the images under different gas volumes in MATLAB2015 software when the temperature difference of the collected black body is 3 ℃, and selecting and intercepting the image with the surface source black body as the background, as shown in FIG. 3;
step 6, opening the images under different gas volumes in MATLAB2015 software when the temperature difference of the collected black body is 0 ℃, and selecting and intercepting the images in the range of the cavity of the gas generation pool as shown in FIG. 4;
step 7, calculating the SiTF of the gas leak detector in MATLAB2015 software by using the intercepted image with the surface source black body as the background, wherein the calculation formula of the SiTF is as follows:
SiTF= 
（1）；
(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 image processing function of MATLAB2015 software is used for directly calculating the value of the transfer function SiTF to be 0.136;
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:
V rms =
（2）；
(2) In the formula, N is the number of acquisition points, namely the number of images within the cavity 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 RMS noise V rms Calculating the corresponding NEC parameter value to be 356.76ppm; the calculation formula of the NEC parameters is as follows:
NEC=
（3）；
step 10, obtaining the NECL parameter value of the instrument as 178.38ppm/m by integration according to the length of the gas chamber of the gas generating pool 3, namely the length of the cavity body is 1 m; the calculation formula of the NECL parameter is as follows:
NECL=
×xdx (4)。
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.
Comparative example 1: in this example, the volumes of injected gas were changed to 500ml, 2500ml, 5000ml, 7500ml, and 10000ml, respectively, and the other contents were the same as in example 1, and images were collected and NECL parameters of the same gas leak detector were calculated.
Calculating the SiTF of the gas leak detector to be 0.059 through the change of the concentration;
calculating the root mean square noise of the image to be 75.76;
calculating the corresponding NEC to be 1284.06ppm;
the lumen length was not changed to 1m and the integration gave a NECL parameter for this instrument of 642.03ppm/m.
Comparative example 2: in this embodiment, the black body temperature difference setting value set when an image with a surface source black body as a background is selected and intercepted is 5 ℃, and the other contents are the same as those in embodiment 1, and the image is acquired and the NECL parameter of the same gas leak detector is calculated.
The SiTF of the gas leak detector is calculated to be 0.043 through the change of the concentration;
calculating the root mean square noise of the image to be 69.89;
calculating NEC corresponding to the images to be 1625.34ppm respectively;
the lumen length did not change to 1m and integration gave a NECL parameter for the instrument of 812.67ppm/m.
Through the embodiment and the comparative example, the detection accuracy of the NECL parameter value is related to the temperature difference value of the background surface source black body and the volume of gas injected into the gas generating cell. When the volume change of injected gas is too large or the temperature difference of a background surface source black body is too large, the situations that the transfer function value is too small and the influence of image noise is too large can occur, so that the subsequent calculation result is influenced, and the measured NECL parameter value does not have reliability and cannot be used as detection reference.
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 (6)
1. The method for testing the NECL parameter of the gas leak detector is characterized in that:
the system adopted by the method consists of a gas leak detector, a gas generation pool, a surface source black body, a vacuumizing device, an inflatable 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 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 a double-waveband transmission germanium window with the diameter of 18cm is respectively embedded in the front panel and the rear panel;
the testing method of the detection system comprises the steps of image acquisition and preprocessing, image segmentation, image transfer function calculation, image noise calculation and NECL parameter calculation, wherein:
s1: the image acquisition and preprocessing steps comprise:
s1-1: pumping the air pressure in the gas generating tank to be below 1Pa by adopting a vacuum pumping device;
s1-2: setting the temperature difference of the surface source black body to be any one temperature of-1-3 ℃, then injecting 500-2000ml of low-density gas into the gas generation pool for the first time by the gas filling device, closing the gas valve, and collecting and storing images by using an image reading device after the gas is uniform and stable for 1-3 min;
s1-3: setting the temperature difference of the surface source black body to be 0 ℃, and acquiring and storing an image by using image reading equipment;
s1-4: vacuumizing the gas generating pool again, injecting gas with a volume different from the first filling volume again, wherein the number of refilling times is at least two, and the volume of the gas is any one volume between 500 and 2000 ml; respectively collecting and storing images under different volumes and the temperature difference of the two surface source black bodies;
s2: an image segmentation step, which specifically comprises the following steps:
opening all images acquired in the image acquisition and pretreatment processes in MATLAB2015 software, and selecting and intercepting images taking the surface source black body as a background and images within the cavity range of the gas generation pool;
s3: the image transfer function calculating step specifically comprises the following steps:
calculating an image transfer function SiTF of the gas leak detector in MATLAB2015 software by using the intercepted image with the surface source black body as the background, wherein the calculation formula of the SiTF is as follows:
SiTF =
（1）；
(1) In the formula, N is the number of the acquisition points, namely the number of the acquired images with the surface source black body as the background;
d
outputting a differential network temperature signal for the differential black body;
s4: the image noise calculation step specifically comprises the following steps:
calculating the root mean square noise V of the captured image in MATLAB2015 software rms Parameter, V rms The parameter calculation formula is as follows:
V rms =
（2）；
(2) N in the formula is the number of acquisition points, namely the number of images in the cavity range of the generation pool;
s5: the calculation steps of the NECL parameters specifically include:
based on SiTF and RMS noise V rms Calculating a corresponding NEC parameter value, and then calculating a NECL parameter value;
the calculation formula of the NEC parameter is as follows:
NEC=
（3）；
the calculation formula of the NECL parameter is as follows:
NECL=
×xdx (4)。
2. the method of claim 1, wherein said image reading means comprises Framelink Express acquisition software, a Camerlink video acquisition card, and a storage device.
3. The method of claim 1 wherein said low density gas is methane or ethylene.
4. The method of claim 1 wherein the evacuating means comprises a molecular pump and a mechanical pump, the gas generation cell is connected to the molecular pump through a gas outlet, and the molecular pump is connected to the mechanical pump.
5. A method as claimed in claim 1, characterized in that the aerating means is formed by a flow meter, a gas tank and a pressure relief valve, the gas generating tank is connected to the flow meter via a gas inlet, the flow meter is connected to the gas tank, and the pressure relief valve is arranged on the gas tank.
6. The method for testing the NECL parameters of a gas leak detector as claimed in claim 1, wherein the pressure detecting means is comprised of an ionization gauge, a resistance gauge and a microcomputer type digital display composite vacuum gauge, the ionization gauge and the resistance gauge are connected to the microcomputer type digital display composite vacuum gauge.
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