CN104677860B - Rapid aircraft fuel cleanliness detection method - Google Patents

Abstract

The invention discloses a rapid aircraft fuel cleanliness detection method. In a stage of establishing pure aircraft fuel cleanliness scattering data, a first computer acquires brillouin scattering signals of first to eighth reflecting mirrors at different time periods by a first ICCD, draws brillouin scattering signal data generated at different optical paths, and establishes a brillouin scattering signal database of pure aircraft fuel according to the acquired brillouin scattering signal data; at the cleanliness detection stage of the to-be-detected aircraft fuel, the acquired brillouin scattering signal data and the established brillouin scattering signal database of the pure aircraft fuel are compared by a second computer, so that the cleanliness of the to-be-detected aircraft fuel can be obtained. According to the invention, when the aircraft fuel is detected, deep-seated aircraft fuel can be subjected to non-contact detection, so that the complex working procedures and long detection time of the traditional sampling detection are prevented; the rapid aircraft fuel cleanliness detection method is long in timeliness and capable of resisting interference.

Description

Rapid detection method of aviation fuel cleanliness

technical field

The invention relates to a photon detection technology, in particular to a rapid detection method for the cleanliness of aviation fuel.

Background technique

Aviation fuel is the "blood" of the aircraft, and the cleanliness of the "blood" directly affects the safety of the aircraft. According to the US Air Force statistics, 33% of secondary accidents, 50% of accidents are caused by low-quality fuel. In the 1970s and 1980s, the water and mechanical impurities contained in the oil in the pipeline caused severe freezing of the Gela pipeline on the Qinghai-Tibet Plateau, causing serious economic losses. However, most of the detection methods currently used for oil products are chemical analysis methods, and the equipment used in this method is complicated, the analysis time is long, the workload is heavy, the aseptic conditions are harsh, and the timeliness is relatively poor. Moreover, in wartime and emergency training situations, the naked eye observation method is used for high timeliness. The subjectivity and low accuracy rate caused by human factors and individual differences can be imagined, and its water content is even more difficult to judge.

Contents of the invention

The technical problem to be solved by the present invention is to provide a detection method, using Brillouin scattering as a non-contact "probe", with the advantages of strong real-time performance, anti-interference, convenience and quickness, to realize the cleanliness of aviation fuel Accurate and fast detection.

The present invention adopts the following technical solutions to achieve the above object. The rapid detection method for the cleanliness of aviation fuel includes two stages of establishing the cleanliness scattering data of pure aviation fuel and detecting the cleanliness of the aviation fuel to be tested:

The stage of establishing the cleanliness scattering data of pure aviation fuel;

The first telephoto lens is docked with the first ICCD, and the first ICCD and the first laser are respectively connected to the first computer through data lines; the aviation fuel glass tank is filled with pure aviation fuel, and the inner wall is sequentially staggered with first reflectors, The second reflector, the third reflector, the fourth reflector, the fifth reflector, the sixth reflector, the seventh reflector and the eighth reflector; between the first laser and the aviation fuel glass tank, there are first A half-wave plate, a first polarizer and a first quarter-wave plate, and the incident laser light of the first laser is coaxial with the first half-wave plate, the first polarizer and the first quarter-wave plate, aviation fuel A first reflector is arranged on the opposite surface of the glass tank where the laser light is incident, and a ninth reflector is arranged on one side of the first polarizer; a first slit and a second slit are arranged in sequence between the ninth reflector and the first telephoto lens. A convex lens, a second slit, a second convex lens and a first F-P etalon;

The detection steps are as follows:

1) Turn on the first computer and start the first laser and the first ICCD;

2) Inject pure aviation fuel into the glass tank of aviation fuel through the notch;

3) The laser light passes through the first half-wave plate, the first polarizer and the first quarter-wave plate in sequence, and then enters the first reflector in the aviation fuel glass tank, and is reflected by the first reflector to the second reflector in turn. mirror, the third reflector, the fourth reflector, the fifth reflector, the sixth reflector, the seventh reflector and the eighth reflector, and then horizontally shoot out of the aviation fuel glass tank after being reflected by the eighth reflector;

4) The first computer collects the Brillouin scattering signals of different time periods from the first reflector to the eighth reflector through the first ICCD, and draws the Brillouin scattering signal data generated by different optical paths;

5) The first computer establishes a Brillouin scattering signal database of pure aviation fuel according to the collected Brillouin scattering signal data;

The detection stage of the cleanliness of the aviation fuel to be tested;

The second telephoto lens is docked with the second ICCD, the second ICCD and the second laser are respectively connected to the second computer through the data line, the aviation fuel tank is filled with the aviation fuel to be tested, and the second laser is arranged in turn between the aviation fuel tank There are a second half-wave plate, a second polarizer, a second quarter-wave plate and a tenth reflector; one side of the second polarizer is provided with a ninth reflector; the ninth reflector is connected to the second telephoto lens A first slit, a first convex lens, a second slit, a second convex lens and a second F-P etalon are sequentially arranged between them;

The detection steps are as follows:

1) Turn on the second computer and start the second laser and the second ICCD;

2) The laser light emitted by the second laser passes through the second half-wave plate, the second polarizer, the second quarter-wave plate to the tenth reflector in sequence, and is reflected by the tenth reflector and then shoots into the aviation fuel tank. In the aviation fuel to be tested;

3) When the laser is transmitted in the aviation fuel to be tested, Brillouin backscattering signals will be generated at different depths, and return according to the original optical path and be separated from the incident laser light after being reflected by the second polarizer to the ninth reflector. Signal light, the signal light sequentially passes through the first slit, the first convex lens, the second slit, the second convex lens and the second F-P etalon and enters the second telephoto lens, and finally the spectrum is recorded by the second ICCD; the second The computer collects Brillouin scattering signals at different times through the second ICCD and draws the Brillouin scattering signal data generated at different depths;

4) The second computer compares the collected Brillouin scattering signal data with the established Brillouin scattering signal database of pure aviation fuel to obtain the cleanliness of the aviation fuel to be tested.

Further, the width of the first slit is the same as the beam diameter of the signal light.

Further, the Brillouin scattering signals generated at different depths are frequency shift, line width and signal-to-noise ratio.

The invention has the advantages of non-contact detection of deep aviation fuel, avoiding the cumbersome procedures and lengthy detection time of traditional sampling detection, and the method has strong timeliness and anti-interference.

Description of drawings

Figure 1 is a schematic diagram of the establishment device for the cleanliness scattering data of pure aviation fuel.

Fig. 2 is a schematic diagram of an establishment device for testing the cleanliness of aviation fuel to be tested.

detailed description

Below in conjunction with accompanying drawing and embodiment the present invention will be further described, referring to Fig. 1 and Fig. 2, aviation fuel cleanliness fast detection method, comprises the detection two stages of setting up pure aviation fuel cleanliness scattering data and test aviation fuel cleanliness:

The first stage: establish the cleanliness scattering data of pure aviation fuel, see Figure 1;

The first telephoto lens 21 is docked with the first ICCD 22 , and the first ICCD 22 and the first laser 1 are connected with the first computer 23 through a data line. The incident laser is coaxial with the first half-wave plate 2, the first polarizer 3 and the first quarter-wave plate 4 and passes through these three optical devices in sequence. The laser beam enters the aviation fuel glass tank 5 and passes through the first Reflecting mirror 7, the second reflecting mirror 8, the third reflecting mirror 9, the fourth reflecting mirror 10, the fifth reflecting mirror 11, the sixth reflecting mirror 12, the seventh reflecting mirror and the eighth reflecting mirror eject the aviation fuel glass Slot 5, at this time, the incident laser light in the pure aviation fuel 27 will produce back Brillouin scattered signals, and these signals return according to the original optical path and are reflected by the first polarizer 3 and the ninth reflector 15 to be combined with the incident laser light Separation, the signal light passes through the first slit 16, converges through the first convex lens 17 and passes through the second slit 18, and the second convex lens 19 collimates the signal light, and the collimated signal light passes through the first F-P etalon 20 After splitting, the light enters the telephoto lens 21, and finally the spectrum is recorded by the first ICCD22.

The aviation fuel glass tank 5 is provided with a first reflector 7, a second reflector 8, a third reflector 9, a fourth reflector 10, a fifth reflector 11, a sixth reflector 12, a seventh reflector and a third reflector. The purpose of the eight reflectors is: in order to reduce the difference in the cleanliness of aviation fuel at different depths and minimize the size of the aviation fuel glass tank 5, the multiple reflections of multiple sets of reflectors in a limited space are used to increase the optical path while meeting the measurement requirements. Depth needs.

The width of the first slit 16 is the same as the beam diameter of the signal light, so as to filter out stray light.

The focus of the spectrum recorded by the first ICCD22 is to control the acquisition of Brillouin scattering signals generated by different optical paths by adjusting the acquisition time.

The detection steps are as follows:

1) Turn on the first computer and start the first laser and the first ICCD;

2) inject pure aviation fuel 27 through the notch 6 of the aviation fuel glass tank 5;

3) The laser beam passes through the first half-wave plate 2, the first polarizer 3 and the first quarter-wave plate 4 and then enters the aviation fuel glass tank 5, and the laser beam is reflected by the first reflector 7 and then directed to the first Two reflecting mirrors 8, the laser is horizontally directed to the third reflecting mirror 9 after being reflected by the second reflecting mirror 8, and the laser is directed to the fourth reflecting mirror 10 after being reflected by the third reflecting mirror 9, and the laser light passes through the reflection of the fourth reflecting mirror 10 After reflection, the laser is horizontally directed to the fifth reflector 11, and the laser beam is reflected by the fifth reflector 11 and then directed to the sixth reflector 12. After being reflected by the sixth reflector 12, the laser is horizontally directed to the seventh reflector 13. After the reflection of the seven reflectors 13, it is directed to the eighth reflector 14, and the laser is horizontally ejected out of the aviation fuel glass tank 5 after being reflected by the eighth reflector 14;

4) The first computer 23 collects the Brillouin scattering signals at different times through the first ICCD 22 and draws the Brillouin scattering signal data generated by different optical paths;

5) The first computer 23 establishes the Brillouin scattering signal database of the pure aviation fuel 27 according to the collected Brillouin scattering signal data;

The first ICCD 22 collects Brillouin scattering signals at different times and draws the data of the Brillouin scattering signals generated by different optical paths. Collecting the Brillouin scattering signals of different time periods is essentially collecting the Brillouin scattering signals generated by different optical paths. Abyss scatter signal.

The analysis of the data of the Brillouin scattering signal refers to the analysis of the frequency shift, line width and signal-to-noise ratio of the Brillouin scattering signal.

The second stage: the detection of the cleanliness of the aviation fuel to be tested, see Figure 2;

The second telephoto lens 21' is docked with the second ICCD 22', and the second ICCD 22' and the second laser 1' are respectively connected with the second computer 23' through data lines. The incident laser is coaxial with the second half-wave plate 2', the second polarizer 3' and the second quarter-wave plate 4' and passes through these three optical devices in sequence, and the laser light enters through the tenth reflector 24' The aviation fuel to be tested 26' in the aviation fuel tank 25', at this time, the incident laser light in the aviation fuel to be tested 26' at different depths will generate back Brillouin scattering signals, and these back Brillouin scattering signals are according to the original The light path returns and is separated from the incident laser light after being reflected by the second polarizer 3' and the ninth mirror 15', and the signal light passes through the first slit 16' and is converged by the first convex lens 17' to pass through the second slit 18 ', the second convex lens 19' collimates the signal light, and the collimated signal light enters the second telephoto lens 21' after being split by the second F-P etalon 20', and finally the spectrum is recorded by the second ICCD 22'.

The detection steps are as follows:

1) Open the second computer 23' and start the second laser 1' and the second ICCD 22';

2) The laser light is injected into the aviation fuel to be tested 26' in the aviation fuel tank 25' after being reflected by the tenth reflector 24';

3) When the laser is transmitted in the aviation fuel to be tested 26', Brillouin scattering signals will be generated at different depths, and the second computer 23' collects the Brillouin scattering signals at different times through the second ICCD 22' and draws different Depth-generated Brillouin scattering signal data;

4) The second computer 23' compares the collected Brillouin scattering signal data with the established Brillouin scattering signal database of pure aviation fuel 27 to obtain the cleanliness of the aviation fuel 26' to be tested.

The drawing of the Brillouin scattering signal data generated at different depths corresponds to the drawing of the Brillouin scattering signal data generated at different optical paths mentioned in the establishment of the pure aviation fuel 27 cleanliness scattering data.

Embodiment: Fig. 1 is the schematic diagram of the establishment device of pure aviation fuel 27 cleanliness scattering data, when pure aviation fuel 27 cleanliness scattering data is established, must consider the consistency of aviation fuel cleanliness in the container, the glass of small volume The tank is the key to ensure the consistency of aviation fuel cleanliness, but it is difficult for a small-volume glass tank to meet the long-distance optical path requirements. The Brillouin scattering signal avoids the inconvenience of the ultra-long aviation fuel glass tank 5 in the manufacture, use and storage. Multiple reflectors are used to make the laser reflected in the aviation fuel glass tank 5 for many times, so that the laser light can be transmitted in a limited space. The optical path with the same depth as the aviation fuel glass tank 5 is transmitted inside, and finally shoots out from the other end of the aviation fuel glass tank 5 .

The present invention adopts the method of scattering spectroscopy to detect the cleanliness of aviation fuel to make data storage for the Brillouin scattering spectrum of pure aviation fuel 27 in advance, receive the Brillouin scattering signals of different depths of pure aviation fuel 27 and analyze the Brillouin scattering signals produced by different depths The difference of Brillouin scattering signal in signal-to-noise ratio and Brillouin scattering frequency shift and line width. The invention satisfies the requirement for the cleanliness detection of aviation fuel, and is a new method for quickly detecting the cleanliness of aviation fuel.

Claims (3)

1. Aviation Fuel cleanliness factor method for quick, including setting up pure Aviation Fuel cleanliness factor scattering data and aviation to be measured Two stages of the detection of fuel oil cleanliness factor it is characterised in that

Described set up the pure Aviation Fuel cleanliness factor scattering data stage；

First telephoto lens is docked with an ICCD, and an ICCD and first laser device pass through data wire and the first computer respectively Connect；Be loaded with Aviation Fuel glass guide channel pure Aviation Fuel and inwall successively staggered relative equipped with the first speculum, second Speculum, the 3rd speculum, the 4th speculum, the 5th speculum, the 6th speculum, the 7th speculum and the 8th speculum；The One laser instrument is disposed with the first half-wave plate, the first polarizer and the first quarter-wave to Aviation Fuel glass guide channel Piece, and the incident laser of first laser device is coaxial with the first half-wave plate, the first polarizer and the first quarter-wave plate, aviation is fired Oily glass guide channel incident laser opposite face is correspondingly arranged on the first speculum, and the side of the first polarizer is provided with the 9th speculum； It is disposed with the first slit, the first convex lens, the second slit, the second convex lens between 9th speculum to the first telephoto lens With a F-P etalon；

Its detection steps is as follows：

1) open the first computer and start first laser device and an ICCD；

2) pure Aviation Fuel is injected in Aviation Fuel glass guide channel by notch；

3) laser injects Aviation Fuel glass guide channel through after the first half-wave plate, the first polarizer and the first quarter-wave plate successively The first interior speculum, is reflected towards the second speculum, the 3rd speculum, the 4th speculum, the 5th anti-successively through the first speculum After penetrating mirror, the 6th speculum, the 7th speculum and the 8th speculum, then the reflection through the 8th speculum, level projects Aviation Fuel Glass guide channel；

4) the first computer passes through the Brillouin scattering that an ICCD gathers the first speculum to the 8th speculum different time sections Signal, and draw out the brillouin scattering signal data that different light paths produce；

5) brillouin scattering signal of pure Aviation Fuel set up by the first computer according to the brillouin scattering signal data of collection Database；

The detection-phase of described Aviation Fuel cleanliness factor to be measured；

Second telephoto lens is docked with the 2nd ICCD, the 2nd ICCD and second laser pass through data wire respectively with second computer Connect, be loaded with Aviation Fuel to be measured in Aviation Fuel tank, between second laser to Aviation Fuel tank, be disposed with second Half-wave plate, the second polarizer, the second quarter-wave plate and the tenth speculum；The side of the second polarizer is provided with the 9th reflection Mirror；It is disposed with the first slit, the first convex lens, the second slit, second convex between 9th speculum to the second telephoto lens Lens and the 2nd F-P etalon；

Its detection steps is as follows：

1) open second computer and start second laser and the 2nd ICCD；

2) laser that second laser sends is successively through the second half-wave plate, the second polarizer, the second quarter-wave plate to the tenth Speculum, and by the Aviation Fuel to be measured injected after the tenth speculum reflection in Aviation Fuel tank；

3), when laser transmits in Aviation Fuel to be measured, all backward Brillouin scattering signal can be produced in different depth, and by former Light path returns and is separated formation flashlight with incident laser by the second polarizer to after the reflection of the 9th speculum, described flashlight Pass through the first slit, the first convex lens, the second slit, the second convex lens and the 2nd F-P etalon successively and enter the second long lens Head, finally by the 2nd ICCD spectra re-recorded；Second computer passes through the brillouin scattering signal that the 2nd ICCD gathers different time And draw out the brillouin scattering signal data of different depth generation；

4) second computer is dissipated with the Brillouin of the pure Aviation Fuel of foundation according to the brillouin scattering signal data of collection Penetrate Signals Data Base contrast, you can draw the cleanliness factor of Aviation Fuel to be measured.

2. Aviation Fuel cleanliness factor method for quick according to claim 1 is it is characterised in that described first slit stitches Wide identical with the beam diameter of flashlight.

3. Aviation Fuel cleanliness factor method for quick according to claim 1 is it is characterised in that described different depth produces Raw brillouin scattering signal is frequency shift amount, live width amount and signal to noise ratio.