CN104833658B - Eliminating ambient parameter based on light light transmittance influences the detection method of propellant burning property - Google Patents
Eliminating ambient parameter based on light light transmittance influences the detection method of propellant burning property Download PDFInfo
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Abstract
The present invention relates to a kind of detection method that ambient parameter influence propellant burning property is eliminated based on light light transmittance, this method is calibrated by using attenuator, to improve the degree of accuracy of the optical transmittance measurement result of smog.Have studied meteorological condition simultaneously influences to caused by field testing, it is determined that the foundation of meteorological condition and recalibration during field testing, waste caused by avoiding invalid experiment, saves manpower and materials, ensure that the uniformity of test result.
Description
Technical field
It is particularly a kind of that ambient parameter shadow is eliminated based on light light transmittance the present invention relates to SOLID PROPELLANT COMBUSTION performance detection
Ring the detection method of propellant burning property.
Background technology
Low characteristic signal propellant is an important directions of China's propellant technology development.Increasing armament systems
In development process, it is proposed that the on-the-spot test requirement to live shell or Full-scale engine plume smog performance.Either live shell
Or Full-scale engine, because its explosive payload is big, the course of work produces sharp pounding and shock wave, visual field are broader and
Complexity, many factors cause original laboratory plume smog method of testing and equipment to have met that new task will
Ask.
In the test process of outfield, many factors such as complicated change of difference and test environment of test object can all influence to survey
Test result, in the test environment of outfield, various instruments are placed at scene, and advantage is relatively consistent with realism, and shortcoming is exactly
Manual control is unable to due to test environment, in order to preferably simulate reality, seems necessary using field testing, therefore,
Test result is corrected necessary.
Neutral filter is the device that a kind of light by different wave length in light path is decayed according to same ratio, the device
Part does not change the spatial distribution in light beam, can only reduce luminous flux to control the size of light intensity in light path.
The content of the invention
The present invention provides a kind of detection method that ambient parameter influence propellant burning property is eliminated based on light light transmittance, with
Just the deviation of the smog transmitance caused by the meteorological condition of outfield can be calibrated.
The object of the present invention is achieved like this, and eliminating ambient parameter based on light light transmittance influences propellant burning property
Detection method, it is characterized in that：Comprise the following steps：
1) its light transmittance is detected with the attenuator of differential declines rate under the present circumstances；
2) light transmittance of the attenuator of differential declines rate is stored；
3) propellant combustion experiment is carried out, obtains the light transmittance during propellant combustion；
4) according to the light transmittance of the differential declines rate attenuator of storage, using subsection linearity inser value method to propellant combustion
When smog light transmittance be corrected；
I=1,2 ..., n
Wherein x, Si(x) it is respectively to correct front and rear light transmittance, yiFor the variable of attenuator light transmittance, xiFor attenuator
The in-site measurement value of light transmittance；
5) light transmittance of immediate attenuator is found out；
6) light transmittance detection is carried out with immediate attenuator again；
7) whether testing result has the change more than ± 5%；
8) it is not more than ± 5%, light transmittance is it during the propellant combustion obtained in current propellant combustion experiment
Testing result；
9) it is more than ± 5%, repeat step 1), above-mentioned experiment again.
Described attenuator comprises at least more than 10, and the light transmittance of attenuator is descending to have uniform intervals.
When the described attenuator with differential declines rate detects its light transmittance, Transmissivity measurement device is with target plate apart from phase
Together, target plate is parallel towards Transmissivity measurement device.
The described attenuator with differential declines rate detects its light transmittance and detected 2-5 times every time, averages.
During the light transmittance of the attenuator of described storage differential declines rate, one is detected by outfield meteorological condition detecting instrument
Secondary environment parameter.
Described ambient parameter includes humidity, temperature, wind speed, pressure.Propellant smog light screening capacity outfield of the present invention
Test environment background meteorological factor is more, typically takes typical humidity, temperature, wind speed, pressure.
The effective transmittance of described attenuator is：
λ1For the start wavelength of attenuator, λ2For the termination wavelength of attenuator, EλFor solar spectrum radiant illumination, SλTo survey
The spectral sensitivity of measuring appratus, the spectral transmittance of τ (λ) optical filter.
In measurement process, its spectral sensitivity can be considered a constant, and therefore, formula (1) is approximately：
Rule of thumb, wind speed reaches more than 1m/s, recalibrates.
It is an advantage of the invention that：This calibration method is calibrated using attenuator, to improve the optical transmittance of smog
The degree of accuracy of measurement result.Have studied meteorological condition simultaneously influences to caused by field testing, it is determined that gas during field testing
As condition and the foundation of recalibration, waste caused by avoiding invalid experiment, manpower and materials are saved, ensure that test result
Uniformity.
With reference to embodiment accompanying drawing, the invention will be further described：
Brief description of the drawings
Fig. 1 is the field testing environment schematic of the embodiment of the present invention 1；
Fig. 2 is to eliminate ambient parameter based on light light transmittance to influence the detection method step of propellant burning property；
Fig. 3 calibration curve schematic diagrames.
In figure, 1, target plate, 2, rocket afterbody chimney, 3, propellant smog, 4, the attenuator of differential declines rate, 5, pass through
Rate measurement apparatus, 6, outfield meteorological condition detecting instrument, 7, computing unit.
In calibration curve, abscissa is the transmitance of neutral filter, and ordinate is obtained according to transmitance system testing
Smog transmitance.
Embodiment
As shown in figure 1, the real time measure calibration of the meteorological change of propellant smog light screening capacity field testing environmental background
Method, including at least field testing environment is built, installation environment parameter monitoring instrument device, carry out calibration test；Carry out calibration test
Implement according to Fig. 1, monitoring apparatus needed for field testing environment includes：Target plate 1, rocket afterbody chimney 2, propellant smog 3, decline
Subtract piece 4, Transmissivity measurement device 5, outfield meteorological condition detecting instrument 6, computing unit 7；Target plate 1 and Transmissivity measurement device 5
Parallel arrangement, makes the optical sensor light axis of Transmissivity measurement device 5 vertical with the frontal plane of target plate 1, rocket afterbody chimney 2
Be placed between target plate 1 and Transmissivity measurement device 5, rocket afterbody chimney 2 can by target plate 1 and Transmissivity measurement device 5 it
Between space.Computing unit 7 electrically connects Transmissivity measurement device 5 and outfield meteorological condition detecting instrument 6 simultaneously.Measurement target plate carries
For measurement signal source, at the same prevent excessive extraneous background information to be mixed into and so that there is deviation in test result.
As shown in Fig. 2 eliminating ambient parameter based on light light transmittance influences the detection method of propellant burning property, including such as
Lower step：
1) its light transmittance is detected with the attenuator of differential declines rate under the present circumstances；
2) light transmittance of the attenuator of differential declines rate is stored；
3) propellant combustion experiment is carried out, obtains the light transmittance during propellant combustion；
4) according to the light transmittance of the differential declines rate attenuator of storage, using subsection linearity inser value method to propellant combustion
When smog light transmittance be corrected；
I=1,2 ..., n
Wherein x, Si(x) it is respectively to correct front and rear light transmittance, yiFor the variable of attenuator light transmittance, xiFor attenuator
The in-site measurement value of light transmittance.
5) light transmittance of immediate attenuator is found out；
6) light transmittance detection is carried out with immediate attenuator again；
7) whether testing result has the change more than ± 5%；
8) it is not more than ± 5%, light transmittance is it during the propellant combustion obtained in current propellant combustion experiment
Testing result；
9) it is more than ± 5%, repeat step 1), above-mentioned experiment again.
In step 1, attenuator 4 comprises at least more than 10, the light transmittance of attenuator 4 is descending have uniformly between
Every.When detecting its light transmittance with the attenuator of differential declines rate, Transmissivity measurement device is with target plate apart from identical, target plate parallel surface
To Transmissivity measurement device.Its light transmittance is detected with the attenuator of differential declines rate to detect 2-5 times every time, is averaged.
When storing the light transmittance of the attenuator of differential declines rate, a secondary environment is detected by outfield meteorological condition detecting instrument
Parameter.Ambient parameter includes humidity, temperature, wind speed, pressure.The propellant smog light screening capacity field testing environment back of the body of the present invention
Scape meteorological factor is more, typically takes typical humidity, temperature, wind speed, pressure.
Humidity is the index for the degree of drying for weighing air.Under normal circumstances, the humidity of air slowly changes, phase
Bigger to humidity, the water content in air is more, and then the smog transmitance that measures can be made bigger than normal, is found in actual measurement,
At a temperature of 30 degree, relative humidity drops to 4 hours of 45% needs from 60%, and under normal circumstances, humidity changes too fast meeting
Increase the deviation of smog transmitance, rule of thumb, deviation influences less below 5%, therefore, if consumption in experimentation
When it is longer, deviation needs to re-start calibration more than 5%.It is recommended that sunny, it is seen that spend high weather and tested, if examination
The time is tested more than 3 hours, it is necessary to be calibrated.
The smog temperature of propellant is general higher, and field testing environment is open, and the change of temperature can cause the change of humidity,
And in the case of higher temperature, relative humidity is relatively low, at a lower temperature, relative humidity is higher, general field testing environment
30 degree or so can be chosen at, range of temperature is more slow, and in the case of actual measurement, temperature rises to 37 DEG C of needs from 30 DEG C
Nearly four hours, it is proposed that calibrated once within 2 hours.
The pressure of field testing condition seldom changes, and influence of the pressure for test is usually that fuel combustion can be caused not fill
Point, and then cause the transmitance of propellant that measures less than normal.
In actual measurement process, the relation of pressure and transmitance is substantially met
X1For P1The smog transmitance measured under pressure, X2For P2The smog transmitance measured under pressure.
Attenuator is a kind of device for the light intensity that decays, and sheet is made to the absorption characteristic of light using material, is placed in light path,
Can be by light intensity attenuation.It is as follows using the calibrating principle of attenuator：
The definition of optical transmittance is the smog obtained in experiment according to certain method of testing according to lambert-baer's law
Shielding rate, this method is often without calibration, that is, the result measured and actual value can not correspond to.Surveyed using identical
Method for testing, the attenuator 10 of known transmitance is measured, 10 have different optical attenuations, can in the environment of Fig. 1
The different test result of transmitance is obtained, corresponding relation such as Fig. 3 of it and actual result, after obtaining calibration curve, according to calibration
Curve, test result is calibrated.
The effective transmittance of described attenuator is：
λ1For the start wavelength of attenuator, λ2For the termination wavelength of attenuator, EλFor solar spectrum radiant illumination, SλTo survey
The spectral sensitivity of measuring appratus, the spectral transmittance of τ (λ) optical filter.
In measurement process, its spectral sensitivity can be considered a constant, and therefore, formula (1) is approximately：
Rule of thumb, wind speed reaches more than 1m/s, recalibrates.
Claims (1)
1. eliminating ambient parameter based on light light transmittance influences the detection method of propellant burning property, it is characterized in that：Including as follows
Step：
1) its light transmittance is detected with the attenuator of differential declines rate under the present circumstances；Attenuator comprises at least more than 10, declines
The light transmittance for subtracting piece descending has uniform intervals；When detecting its light transmittance with the attenuator of differential declines rate, transmitance is surveyed
Device and target plate are measured apart from identical, target plate is parallel towards Transmissivity measurement device；It is saturating that its is detected with the attenuator of differential declines rate
Light rate detects 2-5 times every time, averages；
2) light transmittance of the attenuator of differential declines rate is stored；
3) propellant combustion experiment is carried out, obtains the light transmittance during propellant combustion；The relation of pressure and transmitance：
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X1For P1The smog transmitance measured under pressure, X2For P2The smog transmitance measured under pressure；
4) according to the light transmittance of the differential declines rate attenuator of storage, cigarette during using subsection linearity inser value method to propellant combustion
The light transmittance of mist is corrected；
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Wherein x, Si(x) it is respectively to correct front and rear light transmittance, yiFor the variable of attenuator light transmittance, xiFor attenuator printing opacity
The in-site measurement value of rate；
5) light transmittance of immediate attenuator is found out；
6) light transmittance detection is carried out with immediate attenuator again；
7) whether testing result has the change more than ± 5%；
8) it is not more than ± 5%, light transmittance detects for it during the propellant combustion obtained in current propellant combustion experiment
As a result；
9) it is more than ± 5%, repeat step 1) -8), above-mentioned experiment again；
During the light transmittance of the attenuator of described storage differential declines rate, a secondary ring is detected by outfield meteorological condition detecting instrument
Border parameter；
Described ambient parameter includes humidity, temperature, wind speed, pressure；
The effective transmittance of described attenuator is：
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λ1For the start wavelength of attenuator, λ2For the termination wavelength of attenuator, EλFor solar spectrum radiant illumination, SλFor measuring instrument
Spectral sensitivity, τ (λ) be optical filter spectral transmittance.
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Citations (3)
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| CN202033268U (en) * | 2011-03-07 | 2011-11-09 | 杜永强 | On-line multipoint calibrating device of on-line continuous particulate concentration monitor |
| CN103335730A (en) * | 2013-06-27 | 2013-10-02 | 北京振兴计量测试研究所 | External field type infrared radiometer |
| CN103983616A (en) * | 2014-05-30 | 2014-08-13 | 南京信息工程大学 | Transmission type visibility measurement device and system linear dynamic range expansion method |
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2015
- 2015-04-17 CN CN201510184754.1A patent/CN104833658B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202033268U (en) * | 2011-03-07 | 2011-11-09 | 杜永强 | On-line multipoint calibrating device of on-line continuous particulate concentration monitor |
| CN103335730A (en) * | 2013-06-27 | 2013-10-02 | 北京振兴计量测试研究所 | External field type infrared radiometer |
| CN103983616A (en) * | 2014-05-30 | 2014-08-13 | 南京信息工程大学 | Transmission type visibility measurement device and system linear dynamic range expansion method |
Non-Patent Citations (1)
| Title |
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| 激光烟雾衰减测试系统的研制;刘智;《中国优秀博硕士学位论文全文数据库 (硕士) 工程科技Ⅱ辑》;20120615;正文第5、35-45页 * |
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