CN103226098A - Method for accuracy calibration of airplane extinguishant concentration test system - Google Patents
Method for accuracy calibration of airplane extinguishant concentration test system Download PDFInfo
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Abstract
The invention belongs to a measurement technology in the field of aviation industry measurement and relates to a method for accuracy calibration of an airplane extinguishant concentration test system. The method comprises the following processes of calibration preparation, standard gas preparation, calibration and the like. The method provided by the invention utilizes a standard substance method to realize calibration and is convenient for increasing and decreasing of calibrating spot quantity according to test system metering demands at any time. The method utilizes a high-stability nitrogen filler as an ineffective concentration component thereby guaranteeing concentration component stability, improving long-term preservation feasibility of standard substances and reducing a metering cost. The calibration process of the method can be carried out under wide environmental conditions. In the metering process having higher accuracy requirements, through increasing of calibrating spot quantity, the correction function is improved. The method aims at special measurement of a special industry, supplies a gap of concentration measurement, and has a large application value.
Description
Technical field
The invention belongs to aircraft industry fields of measurement measurement technology aspect, particularly relate to a kind of aerial extinguishing agent concentration test macro accuracy calibration steps.
Background technology
The agent concentration measuring system is mainly used in the collection and the processing of the data such as agent concentration of the inspection of attack area extinguishing properties such as aircraft engine nacelle and APU cabin, ground simulation test.
The agent concentration measuring system is based on the principle that NDIR (Non-Dispersive Infrared) absorbs gas analysis to the measurement of agent concentration.Asymmetric polyatomic molecule gas all has characteristic absorption peak at infrared band, and when infrared light passed through tested gas, gas molecule will carry out selectivity to infrared radiation and absorb, and only absorbs the infrared radiation of fixing characteristic wavelength.When a branch of light intensity is I
0Parallel infrared light when inciding gas medium because the selectivity of gas medium absorbs, the intensity I of its emergent light decays, and absorbs to concern and follows lambert-Bill (Lambert-Beer) law, promptly
I=I
0exp(-KCL)
In the following formula: the light intensity of I-infrared radiation after by gas absorption;
I
0The light intensity of-infrared radiation before by gas absorption;
The absorption coefficient of K-gas;
The concentration of C-gas;
The L-infrared radiation is by the length of air chamber.
When the kind and characteristic absorption wavelength one timing of gas, K has also just determined.When one timing of air chamber length, as can be seen from the above equation, the size of I is only relevant with gas concentration, and the size of measuring I just can obtain the concentration C of gas.Therefore, have specific infrared absorption wavelength and Lambert-Beer infrared absorption law according to fire-suppressant gas, select gas that the wavelength at the strong absorption peak place of infrared absorption is the measurement wavelength, select a wavelength that infrared light is not had receptivity as reference wavelength in addition, to improve measuring accuracy and sensitivity.The ratio of infrared absorption intensity at its specific characteristic absorption wavelength place is measured the concentration of tested gas by gas.
The present invention is to be the set of the technological means of purpose with the measurement accuracy that guarantees the agent concentration test macro, its characteristics are to adopt the mode of comparing with standard substance, effectively the trace to the source chain of structure from national benchmark to measuring system reaches the requirement of transmission of quantity value, filled up the prior art blank.
Summary of the invention
The objective of the invention is: design a kind of can be under existence conditions, rely on existing technological means, on existing Equipment Foundations, in the aircraft development process, the fire-extinguishing test gas concentration measurement provides the transmission of quantity value function, purpose is for measurement of concetration provides the magnitude tracing chain, guarantees that this measuring equipment can be in the controlled measuring accuracy scope with periodic calibration form.
Technical scheme of the present invention: a kind of aerial extinguishing agent concentration test macro accuracy calibration steps, adopt the standard substance method to the calibration of comparing of aerial extinguishing agent concentration test macro, promptly with the configuration the normal concentration reference gas as standard substance, in the range ability of test macro, accuracy of measurement is carried out calibration correction, may further comprise the steps with multipoint system:
The first step, calibration are prepared: according to the calibration needs, concentration range is set and determines the quantity of calibration point and the concentration value of calibration point;
Second step, configuration standard gas: with concentration be 100% pure gas as master reference, the quantity and the concentration value of the calibration point of be scheduled to according to the first step dispose the standard gas of respective numbers and respective concentration value;
The 3rd step, calibration: the standard gas with configuration is calibration point, aerial extinguishing agent concentration test macro is measured standard gas respectively under the quiescent operation situation, and is benchmark with the value of calibrating gas concentration, the result who measures is revised, make its value consistent with standard gas concentration;
The 4th step, repeat above step, finish periodically transmission of quantity value process of aerial extinguishing agent concentration test macro.
Advantage of the present invention is: this method adopts the standard substance method to realize calibration process, directly obtains the standard volume value information from source base of metering institute of country, and the transmission of quantity value mode is simple, and the chain of tracing to the source is complete stable.Owing to adopted the mode of many gas cylinders to preserve the standard substance of each calibration point respectively, there is not interference factor between the each point standard volume value information, therefore be convenient to increase and decrease at any time the quantity of calibration point according to test macro metering demand.The invalid concentration composition of this method adopts the nitrogen of high stability to fill, under the situation that overcomes gas leakage and the oxidation of gas cylinder material, effective and invalid concentration in the gas cylinder becomes the difficult chemical reaction that takes place of split pole, guaranteed the stability of concentration composition, improve the feasibility of standard substance long preservation, reduced the cost of metering.Adopt the gas concentration that is also advantageous in that of standard substance method under sealing state, not to be subjected to the influence of ambient temperature, pressure, make calibration process under the environmental baseline of broad, to carry out.For the metering process that pin-point accuracy more requires, this method also can promote debugging functions by increasing the mode of calibration point.This method is to invent for the special measurement of reply special trade, filled up the blank of existing concentration measurement, but because the invention process process is based on unrestricted general metering method, therefore the present invention also has the advantage of using to similar technology category expansion except that being used for existing defense technology field.
Embodiment
Below the present invention is done and describe in further detail.
A kind of aerial extinguishing agent concentration test macro accuracy calibration steps, adopt the standard substance method to the calibration of comparing of aerial extinguishing agent concentration test macro, promptly with the configuration the normal concentration reference gas as standard substance, in the range ability of test macro, accuracy of measurement is carried out calibration correction, may further comprise the steps with multipoint system:
The first step, calibration are prepared: according to the calibration needs, concentration range is set and determines the quantity of calibration point and the concentration value of calibration point;
Second step, configuration standard gas: with concentration be 100% pure gas as master reference, the quantity and the concentration value of the calibration point of be scheduled to according to the first step dispose the standard gas of respective numbers and respective concentration value;
The 3rd step, calibration: the standard gas with configuration is calibration point, aerial extinguishing agent concentration test macro is measured standard gas respectively under the quiescent operation situation, and is benchmark with the value of calibrating gas concentration, the result who measures is revised, make its value consistent with standard gas concentration;
The 4th goes on foot, repeats above step, execution cycle property transmission of quantity value process.
Embodiment: following the present invention being done with certain example in the real work describes in further detail.
The first step, calibration are prepared:
Aerial extinguishing agent concentration test macro is 16 channel measurement modes in this example, and the gas concentration measurement scope is (0～20) %, and accuracy of measurement is 0.5%, thus corresponding between calibration range and measurement zone, and select 0%, 5%, 10%, 20% 4 calibration point.
The calibration set-up procedure simultaneously
Second step, configuration standard gas:
Finish at the national standard material center with the qualification of concentration transmission of quantity value that is configured in of calibrating gas, and it is 5 liters steel gas cylinder that the calibrating gas of variable concentrations is respectively charged into volume.Generally speaking, in order to ensure the clean-up effect in the steel cylinder, steel cylinder is disposable use, and gaseous tension is determined according to the steel cylinder withstand voltage in the steel cylinder.Dispose 1 pure nitrogen gas as the benchmark at zero point, the calibrating gas unit of 3 variable concentrations of corresponding all the other the selected calibration points of configuration.
Be subjected to the influence of gas configuration device operation, each calibration point actual concentrations value and setting value had certain deviation after the configuration of standard gas was finished, calibration process with actual disposition as a result concentration value be benchmark.
This layoutprocedure realizes measuring necessary standard value propagation function simultaneously.
The 3rd step, calibration: the standard gas with configuration is calibration point, aerial extinguishing agent concentration test macro is measured standard gas respectively under the quiescent operation situation, and is benchmark with the value of calibrating gas concentration, the result who measures is revised, make its value consistent with standard gas concentration;
Following method is described for the single channel calibration process, and the multiple channel test system repeats according to the single channel calibration steps.
Demarcate zero point
Connect the outlet of gas cylinder at zero point and the inlet of reduction valve, the outlet of reduction valve and the air intake of aerial extinguishing agent concentration test macro to be calibrated passage sampling module to be calibrated are connected, export and connect the bypass that caliber together has flowmeter at reduction valve simultaneously.After checking the nothing gas leakage of confirming to be connected firmly, open the aspiration pump of passage to be calibrated, the aperture of the bypass flow meter in reduction valve exit is transferred to maximum, regulate a passage to be calibrated corresponding panel upper reaches amount meter flow regulation knob then, make flow value be stabilized in 2L/min, appropriateness is opened the valve of gas cylinder reduction valve at zero point then, and the displayed value that makes the bypass flow meter is 0.5L/min.In order to guarantee the pipeline steady air current, guarantee that pipeline inside is full of calibrating gas, made aspiration pump work more about 2 minutes, be calibrated sampling module by software start-up and enter measuring process this moment, and test macro carries out the measurement of concetration at zero point of passage automatically.When modular calibration software page prompts " zero point correction finishes; press the OK key and continue ", the zero point correction of passage to be calibrated finishes, write down concentration measurement this moment simultaneously, file as raw readings, close the valve of gas cylinder reduction valve at zero point, the gas that is full of in the pipeline is discharged, close aspiration pump at last, remove a standard gas cylinder.
Demarcate 5% calibration point
Connect the outlet of 5% concentration standard gas cylinder and the inlet of reduction valve, the air intake of the outlet of reduction valve and passage sampling module to be calibrated, after checking that affirmation is connected firmly, open the aspiration pump of passage to be calibrated, the aperture of the bypass flow meter in reduction valve exit is transferred to maximum, regulate then passage to be calibrated the flow regulation knob of corresponding panel upper reaches amount meter, make flow value be stabilized in 2L/min, appropriateness is opened the valve of gas cylinder reduction valve at zero point then, when making the displayed value of bypass flow meter be 0.5L/min, regulate then passage to be calibrated the flow regulation knob of corresponding panel upper reaches amount meter, make flow value be stable at 2L/min, for the pipeline steady air current, guarantee that pipeline inside is full of calibrating gas, made aspiration pump work more about 2 minutes, start software and enter measuring process this moment, import the actual concentrations value of calibrating gas simultaneously, system carries out second calibration of passage automatically.When second of modular calibration software page prompts demarcated end, pressing the OK key continues " time; record concentration measurement this moment; file; this second calibration of measuring passage finishes; close the standard gas cylinder valve of 5% concentration, and the standard gas of 5% concentration that is full of in the pipeline is discharged, and avoids the interference of the calibration process of any down as raw readings.
The 4th the step, change 10%, 20% standard gas respectively, this calibrated channel is repeated the 3rd step process, finish the calibration process of this passage.
For the hyperchannel concentration measurement system, repeat the 3rd step and FOUR EASY STEPS, finish the calibration of rest channels, after whole calibrate processes finished, the calibration process of aerial extinguishing agent concentration test macro finished.
Be calculated as follows calibration error:
E=Vi-Vs
In the formula:
Vi-is a measured value;
Vs-is a standard value.
Carry out the processing of calibration data according to above requirement.It is qualified to be defined as measuring system when meeting the demands, and grants by the accuracy of measurement of calibration and uses.The calibration cycle of aerial extinguishing agent concentration test macro can be set according to usage frequency and measurement requirement.When calibration error surpasses request for utilization, can adopt the repeatedly mode of calibration, progressively approach the optimum measurement state.
Claims (1)
1. aerial extinguishing agent concentration test macro accuracy calibration steps, adopt the standard substance method to the calibration of comparing of aerial extinguishing agent concentration test macro, promptly with the configuration the normal concentration reference gas as standard substance, in the range ability of test macro, accuracy of measurement is carried out calibration correction with multipoint system, it is characterized in that, may further comprise the steps:
The first step, calibration are prepared: according to the calibration needs, concentration range is set and determines the quantity of calibration point and the concentration value of calibration point;
Second step, configuration standard gas: with concentration be 100% pure gas as master reference, the quantity and the concentration value of the calibration point of be scheduled to according to the first step dispose the standard gas of respective numbers and respective concentration value;
The 3rd step, calibration: the standard gas with configuration is calibration point, aerial extinguishing agent concentration test macro is measured standard gas respectively under the quiescent operation situation, and is benchmark with the value of calibrating gas concentration, the result who measures is revised, make its value consistent with standard gas concentration;
The 4th step, repeat above step, finish periodically transmission of quantity value process of aerial extinguishing agent concentration test macro.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104730021A (en) * | 2013-12-24 | 2015-06-24 | 北京万联达信科仪器有限公司 | Method for calibrating non-dispersive infrared gas sensor |
| CN105424876A (en) * | 2015-11-04 | 2016-03-23 | 中国直升机设计研究所 | Calibrating device for fire extinguishing agent concentration measuring system |
| CN105424542A (en) * | 2015-11-04 | 2016-03-23 | 中国直升机设计研究所 | Calibrating method used for fire extinguishing agent concentration measuring system |
| CN106501744A (en) * | 2016-12-28 | 2017-03-15 | 中国航空工业集团公司西安飞机设计研究所 | A kind of calibration steps of military aircraft supplied character integrated test system |
| CN106707212A (en) * | 2016-12-28 | 2017-05-24 | 中国航空工业集团公司西安飞机设计研究所 | Calibrating method of airplane bus test system |
| CN107515023A (en) * | 2017-08-04 | 2017-12-26 | 中国航空工业集团公司西安飞机设计研究所 | The calibration method and system of aircraft altitude simulation cabin multichannel comprehensive test system |
| CN108732141A (en) * | 2018-06-29 | 2018-11-02 | 深圳大学 | A kind of medical respiration carbon dioxide concentration measurement method and device |
| CN110927346A (en) * | 2019-12-24 | 2020-03-27 | 中国航空工业集团公司西安飞机设计研究所 | Gas concentration test system calibration method and device |
| CN112255138A (en) * | 2020-10-16 | 2021-01-22 | 中国直升机设计研究所 | Special fire extinguishing agent concentration measurement system inspection and maintenance method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104730021A (en) * | 2013-12-24 | 2015-06-24 | 北京万联达信科仪器有限公司 | Method for calibrating non-dispersive infrared gas sensor |
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| CN105424542A (en) * | 2015-11-04 | 2016-03-23 | 中国直升机设计研究所 | Calibrating method used for fire extinguishing agent concentration measuring system |
| CN106501744A (en) * | 2016-12-28 | 2017-03-15 | 中国航空工业集团公司西安飞机设计研究所 | A kind of calibration steps of military aircraft supplied character integrated test system |
| CN106707212A (en) * | 2016-12-28 | 2017-05-24 | 中国航空工业集团公司西安飞机设计研究所 | Calibrating method of airplane bus test system |
| CN107515023A (en) * | 2017-08-04 | 2017-12-26 | 中国航空工业集团公司西安飞机设计研究所 | The calibration method and system of aircraft altitude simulation cabin multichannel comprehensive test system |
| CN108732141A (en) * | 2018-06-29 | 2018-11-02 | 深圳大学 | A kind of medical respiration carbon dioxide concentration measurement method and device |
| CN108732141B (en) * | 2018-06-29 | 2021-01-05 | 深圳大学 | Method and device for measuring concentration of medical breathing carbon dioxide |
| CN110927346A (en) * | 2019-12-24 | 2020-03-27 | 中国航空工业集团公司西安飞机设计研究所 | Gas concentration test system calibration method and device |
| CN110927346B (en) * | 2019-12-24 | 2022-07-19 | 中国航空工业集团公司西安飞机设计研究所 | Gas concentration test system calibration method and device |
| CN112255138A (en) * | 2020-10-16 | 2021-01-22 | 中国直升机设计研究所 | Special fire extinguishing agent concentration measurement system inspection and maintenance method |
| CN112255138B (en) * | 2020-10-16 | 2023-12-29 | 中国直升机设计研究所 | Inspection and maintenance method for special fire extinguishing agent concentration measurement system |
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Application publication date: 20130731 |