CN101792021A - Rotating body surface non-contact icing detector - Google Patents
Rotating body surface non-contact icing detector Download PDFInfo
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- CN101792021A CN101792021A CN201010100530A CN201010100530A CN101792021A CN 101792021 A CN101792021 A CN 101792021A CN 201010100530 A CN201010100530 A CN 201010100530A CN 201010100530 A CN201010100530 A CN 201010100530A CN 101792021 A CN101792021 A CN 101792021A
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Abstract
The invention relates to a rotating body surface non-contact icing detector. A signal generator drives a laser probe to generate laser pulses emitted to the surface of a rotating body; a photoelectric detector receives returned optical signals and converts the optical signals into electrical signals; the electrical signals are divided into two paths after signal amplification and improvement on signal to noise ratio; one path reaches a signal processor through a high threshold comparator and a high threshold stretcher, and is used for judging distribution range of chordwise icing on the surface of the rotating body; the other path reaches the signal processor through a low threshold comparator and a low threshold stretcher, and is used for judging transit time that the surface of the rotating body passes the upper side of the probe of photoelectric detector; and the signal processor generates icing alarm signals according to judgment results of both paths of signals and outputs the icing alarm signals to an alarm circuit. The icing detector directly detects the icing state and the icing range on the surface of a detected object in a non-contact way, avoids transmitting movable component measuring signals, and is suitable for detecting the icing state on the surface of helicopter rotor wings and surfaces of other rotating bodies in real time.
Description
Technical field
The present invention relates to opto-electronic pickup, be specially rotating body surface non-contact icing detector, be used for lifting airscrew and other rotating object surface situation of freezing are carried out real-time detection.
Background technology
The present icing method of lifting airscrew that abroad is used for mainly contains following five kinds: the icing passive type infrared acquisition method of (1) lifting airscrew is surveyed the heat that discharges when super-cooling waterdrop freezes on the lifting airscrew surface by infrared detector, obtains the icing information of corresponding lifting airscrew.This method requires highly sensitive infrared detector, and so not only infrared detector costs an arm and a leg, and infrared detector is easy to be subjected to the interference of external environment, influences result of a measurement.(2) be to transfer wire of direction adhesion in the exhibition of lifting airscrew surface based on the icing probe method of the lifting airscrew of Time Domain Reflectometry, and in electromagnetic pulse of transfer wire emission, this electromagnetic pulse is propagated along transfer wire, reflect in the place that the transfer wire impedance changes, because the ice dielectric property different with air obtains different reflection configurations, thereby inquire into the situation of change that the lifting airscrew surface freezes.(3) Britain Pu Laixi (Plessey) aviation electronics company is by surveying extraneous ambient temperature, atmospheric pressure and the aqueous water content module as icing intensity in the invention icing detector of eighties of last century the eighties.Said method (2) all must contact the ice surface with (3), adopts the contact method to measure.(4) the surface acoustic wave method utilizes surface acoustic wave to be subjected to the material parameter of medium and the influence of thickness of dielectric layers in communication process, and the principle that the form of its frequency displacement or phase transformation can change obtains the information of freezing.But the method is subjected to the influence of rotor surface area water and variation of ambient temperature easily, yet there are no the report of its practical application.(5) 2004 years U.S. announce the lifting airscrew icing detector patent (patent No. US6819265B2) of a laser energy reflection, this detector utilizes laser to the pulse of lifting airscrew surface-emitting laser, when the lifting airscrew surface freezes, variation by the laser-bounce energy, can be to atmosphere aqueous water content (the LiquidWater Content in the helicopter flight environment, be called for short LWC) measure, obtain the icing information of corresponding lifting airscrew.But this technology belongs to indirect measurement, does not also see the report of practical application.
Domestic lifting airscrew icing detection technology develops relatively backwardly for western developed country, up to the present, domesticly can provide correlation technique or product without any a tame unit.
Summary of the invention
The object of the present invention is to provide a kind of rotating body surface non-contact icing detector, can be with the icing state and the scope on noncontact mode direct detection lifting airscrew and other rotating object surface.
Rotating body surface non-contact icing detector comprises signal generator 12, laser driver 1, laser probe, photodetector 3, Signal Pretreatment unit, high threshold comparator 7, high threshold stretcher 9, low threshold comparator 8, low threshold stretcher 10, signal processor 11 and warning circuit;
Technique effect of the present invention is embodied in: the present invention is with the icing state and the scope on noncontact mode direct detection lifting airscrew and other rotating object surface, arrive tested rotating body surface by the emission low-power laser, the icing position of body surface changes because of absorption causes intensity of reflected light, the variation of real-time detection receiving light power degree is detectable icing status information, freeze the position along tangential distribution limit by measuring in real time the transit time at the position that freezes, can judging simultaneously.Adopt the noncontact mode to avoid the transmission of movable member measurement signal, be applicable to lifting airscrew and other rotating object surface situation of freezing are carried out real-time detection.Easy for installation, guarantee not destroy lifting airscrew and rotating object structure, the synchronous signal transmission need not to pass through sr.
Description of drawings
Fig. 1 is a system construction drawing of the present invention;
Fig. 2 is the laser probe constructional drawing;
Fig. 3 is the laser probe end view drawing;
Fig. 4 is dual threshold comparator output signal figure;
Fig. 5 compares the broadening output signal diagram for dual threshold.
The specific embodiment
Now a kind of specific embodiment of the present invention is described in detail in conjunction with Fig. 1 to Fig. 5.
In Fig. 1, produce square wave by signal generator 12, except that produce laser pulse by laser driver 1 drive laser 2, simultaneously as giving synchronous integrator 6 with reference to signal, giving digital signal processor 11 as interrupt signal.When not having the generation of freezing, emission light is by laser probe directive rotor or rotating object surface, and the stronger reflected light of reflected back, and photodetector 3 can detect stronger optical signal relatively.When the rotating object searching surface has when icing, the emission light under this wavelength is absorbed a part by ice sheet, and the reflected light that reflected back is more weak relatively, photodetector 3 detect more weak optical signal relatively.Photodetector 3 converts optical signal to electric signal, amplify through preamplifier 4, variable gain amplifier 5, carry out the impulse singla of output two-way high s/n ratio behind the related operation by synchronous integrator 6, one tunnel output through low threshold comparator 8 and low threshold stretcher 10 can offer digital signal processor 11, is used to differentiate the transit time of rotating body surface through the probe top; Another road can offer digital signal processor 11 through the output of high threshold comparator 7 and high threshold stretcher 9, is used to differentiate rotating body surface along tangential icing distribution limit.When the icing scope of judging during greater than setting value, by the digital signal processor 11 outputs warning signal of freezing, and by the warning circuit output that constitutes by alarm relay 13, alarm communication interface 14 and alarm indicator 15 warning signal of freezing.
Wherein, preamplifier 4 adopts low noise amplifier, and individual screen; The gain of variable gain amplifier 5 is set and change according to the output of low threshold comparator 8 by digital signal processor 11, if low threshold comparator 8 no high level are exported in the limited time, then increases the gain of variable gain amplifier 5; High threshold stretcher 9 and low threshold stretcher 10 all are stretchers, and just its incoming signal is respectively from the output of high threshold comparator 7 and low threshold comparator 8; On high and low thresholding is concrete is two DC levels, when the amplitude of synchronous integrator 6 output pulses during greater than low-threshold-level, and the identical pulse of low threshold comparator 8 outputs, otherwise low threshold comparator 8 output low levels; When the amplitude of synchronous integrator 6 output pulses during greater than the high threshold level, the identical pulse of high threshold comparator 7 outputs, otherwise high threshold comparator 7 output low levels; The dc voltage value of high threshold level is higher than the dc voltage value of low-threshold-level.High threshold level, low-threshold-level are determined by test, the surface is not V1 through the amplitude of the overhead corresponding synchronous integrator 6 output pulses of laser probe if rotating body freezes, the icing surface of rotating body is V2 through the amplitude of the overhead corresponding synchronous integrator 6 output pulses of laser probe, rotating body surface is V3 without the amplitude of crossing the overhead corresponding synchronous integrator 6 output pulses of laser probe, then the high threshold level is set between V1 and the V2, and low-threshold-level is set between V2 and the V3.
Fig. 2 is the laser probe structural representation; laser probe comprises laser 2, filter 16, receives fibre bundle 17 and heat protection assembly; laser 2 is positioned at the axis of laser probe; parallel installation receives fibre bundle 17 around it; filter 16 is fixed on the two top; heat protection assembly is installed on the skin of laser probe, and hot blast is directed to the filter outside face by heat protection assembly, can avoid laser probe to freeze.Heat protection assembly comprises temperature sensor 18, heat pump 22, insulating liners 19 and hot protective case 20; temperature sensor 18 embeds in the metal construction of laser probe; near receiving fibre bundle 17 outsides; sticking adiabatic liner 19 around it; the air of the peripheral logical heat protection of insulating liners 19 are laid in laser 2, filter 16, the outside that receives fibre bundle 17 and to be prevented that its temperature from crossing low and icing hot protective case 20.Laser 2 operating wavelengths are infrared band, and to reduce the interference of visible light to detector, the effect of filter 16 is that the light that reduces the inoperative wavelength sees through, to reduce the influence of bias light.Emission light is by laser 2 directive rotors or rotating object surface, and photodetector 3 can detect the light of rotating object return reflection surface by the guiding that receives fibre bundle 17.Simultaneously, when the laser probe front end temperature of being surveyed by temperature sensor 18 is lower than a certain temperature (as 10 ℃),,, avoid the laser probe surface to freeze to add hot air and to blow over the laser probe surface by temperature controller 21 automatic guidance heat pumps 22.Fig. 3 is the end view drawing of laser probe, shows the layout scheme drawing of emitting laser 2 and reception fibre bundle 17.
Fig. 4 freezes for the rotating object surface through laser probe top and is non-when icing, the output pulse signal scheme drawing of high threshold comparator 7 and low threshold comparator 8.As long as rotating body surface is through the laser probe top, just there is impulse singla in the output of low threshold comparator 8, otherwise the output low level signal; As long as the non-icing position of rotating body surface is through the laser probe top, just there is impulse singla in the output of high threshold comparator 7, otherwise the output low level signal.
Fig. 5 freezes for the rotating object surface through laser probe top and is non-when icing, the output signal scheme drawing of high threshold stretcher 9 and low threshold stretcher 10.Low threshold stretcher 10 output signals are characterized as: no matter whether freeze, when rotor or process probe top, rotating object surface, output signal is a high level; When rotor or rotating object left the probe top, output signal was a low level.High threshold stretcher 9 output signals are characterized as: when rotor that has the position that freezes or process probe top, rotating object surface, output signal is a high level; When the probe top was left on the rotor that has the position that freezes or rotating object surface, output signal was a low level.
Claims (4)
1. rotating body surface non-contact icing detector comprises signal generator (12), laser driver (1), laser probe, photodetector (3), Signal Pretreatment unit, high threshold comparator (7), high threshold stretcher (9), low threshold comparator (8), low threshold stretcher (10), signal processor (11) and warning circuit;
Signal generator (12) produces the laser pulse of directive rotating body surface by laser driver (1) driving laser probe, photodetector (3) receives the optical signal that rotating body surface returns, be converted into electric signal, electric signal is through after the amplification of Signal Pretreatment unit and improving signal to noise ratio, be divided into two-way: the one tunnel through high threshold comparator (7) and high threshold stretcher (9) arriving signal treater (11), and another road process is through low threshold comparator (8) and low threshold stretcher (10) arriving signal treater (11); Signal processor (11) is differentiated the icing warning signal of generation and is exported to warning circuit according to this two paths of signals.
2. rotating body surface non-contact icing detector according to claim 1; it is characterized in that; described laser probe comprises laser (2), filter (16), receives fibre bundle (17) and heat protection assembly; receiving fibre bundle (17) is that the axle center is around layout with laser (2); filter (16) is positioned at the top that receives fibre bundle (17) and laser (2), and the outside that receives fibre bundle (17) is provided with heat protection assembly.
3. rotating body surface non-contact icing detector according to claim 2; it is characterized in that; described heat protection assembly comprises temperature sensor (18); insulating liners (19); hot protective case (20); temperature controller (21) and heat pump (22); temperature sensor (18) is located at and receives fibre bundle (17) outside; temperature sensor (18) is sticking adiabatic liner (19) on every side; the peripheral logical heat protection air of insulating liners (19); in laser (2); filter (16); the outside that receives fibre bundle (17) is laid and is prevented that its temperature from crossing low and icing hot protective case (20); temperature sensor (18) connects temperature controller (21), and temperature controller (21) connects heat pump (22).
4. according to claim 1 or 2 or 3 described rotating body surface non-contact icing detectors, it is characterized in that, the threshold level of high threshold comparator (7) is greater than V1 and less than V2, the threshold level of low threshold comparator (8) is greater than V2 and less than V3, V1 is the amplitude of the icing surface of rotating body through the overhead respective signal pretreatment unit output of laser probe pulse, V2 is that rotating body freezes the surface through the amplitude of the overhead respective signal pretreatment unit output of laser probe pulse, and V3 is that rotating body surface is without the amplitude of crossing the overhead respective signal pretreatment unit output of laser probe pulse.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010100530A CN101792021A (en) | 2010-01-22 | 2010-01-22 | Rotating body surface non-contact icing detector |
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| CN201010100530A CN101792021A (en) | 2010-01-22 | 2010-01-22 | Rotating body surface non-contact icing detector |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102944249A (en) * | 2012-10-19 | 2013-02-27 | 华中科技大学 | Measuring device for measuring output signals of passive sensor and signal detecting system |
| CN103782156A (en) * | 2011-07-01 | 2014-05-07 | Vtt技术研究中心 | Arrangement and method for icing detection |
| CN106628192A (en) * | 2016-12-02 | 2017-05-10 | 武汉航空仪表有限责任公司 | Icing detector outline with small radar cross section (RCS) |
| CN107839891A (en) * | 2016-09-21 | 2018-03-27 | 谢潇君 | A kind of wing, empennage anti-icing and deicing system |
| EP3399338A1 (en) * | 2017-05-04 | 2018-11-07 | The Boeing Company | Light detection and ranging (lidar) ice detection system |
| CN108917949A (en) * | 2018-06-27 | 2018-11-30 | 武汉工程大学 | A kind of signal controller for temperature alarming |
| CN109421935A (en) * | 2017-08-25 | 2019-03-05 | 通用电气航空***有限公司 | Method and apparatus for predicting to be conducive to the condition of icing |
| CN110425094A (en) * | 2019-08-14 | 2019-11-08 | 中国华能集团有限公司 | A kind of wind power generation unit blade based on optical principle congeals detection device and method |
| CN111122471A (en) * | 2019-12-27 | 2020-05-08 | 湖南森尚仪器有限公司 | Laser receiver erection equipment |
| CN114162331A (en) * | 2022-02-14 | 2022-03-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Icing detection device and icing detection method |
| CN114476083A (en) * | 2021-12-31 | 2022-05-13 | 中国航空工业集团公司西安飞机设计研究所 | Shape-preserving type icing detection system and method |
| CN115525080A (en) * | 2022-11-23 | 2022-12-27 | 北京昆仑海岸科技股份有限公司 | Anti-icing control method and system based on temperature monitoring |
-
2010
- 2010-01-22 CN CN201010100530A patent/CN101792021A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103782156A (en) * | 2011-07-01 | 2014-05-07 | Vtt技术研究中心 | Arrangement and method for icing detection |
| US9690008B2 (en) | 2011-07-01 | 2017-06-27 | Teknologian Tutkimuskeskus Vtt Oy | Arrangement and method for icing detection |
| CN103782156B (en) * | 2011-07-01 | 2019-09-10 | Vtt技术研究中心 | Freeze the device and method detected |
| CN102944249A (en) * | 2012-10-19 | 2013-02-27 | 华中科技大学 | Measuring device for measuring output signals of passive sensor and signal detecting system |
| CN107839891A (en) * | 2016-09-21 | 2018-03-27 | 谢潇君 | A kind of wing, empennage anti-icing and deicing system |
| CN106628192A (en) * | 2016-12-02 | 2017-05-10 | 武汉航空仪表有限责任公司 | Icing detector outline with small radar cross section (RCS) |
| US10429511B2 (en) | 2017-05-04 | 2019-10-01 | The Boeing Company | Light detection and ranging (LIDAR) ice detection system |
| EP3399338A1 (en) * | 2017-05-04 | 2018-11-07 | The Boeing Company | Light detection and ranging (lidar) ice detection system |
| CN108802743A (en) * | 2017-05-04 | 2018-11-13 | 波音公司 | Light detection and ranging LIDAR ice detecting systems |
| CN108802743B (en) * | 2017-05-04 | 2023-10-10 | 波音公司 | Light Detection and Ranging LIDAR Ice Detection System |
| CN109421935A (en) * | 2017-08-25 | 2019-03-05 | 通用电气航空***有限公司 | Method and apparatus for predicting to be conducive to the condition of icing |
| US11358727B2 (en) | 2017-08-25 | 2022-06-14 | Ge Aviation Systems Limited | Method and apparatus for predicting conditions favorable for icing |
| CN108917949A (en) * | 2018-06-27 | 2018-11-30 | 武汉工程大学 | A kind of signal controller for temperature alarming |
| CN110425094A (en) * | 2019-08-14 | 2019-11-08 | 中国华能集团有限公司 | A kind of wind power generation unit blade based on optical principle congeals detection device and method |
| CN111122471A (en) * | 2019-12-27 | 2020-05-08 | 湖南森尚仪器有限公司 | Laser receiver erection equipment |
| CN114476083A (en) * | 2021-12-31 | 2022-05-13 | 中国航空工业集团公司西安飞机设计研究所 | Shape-preserving type icing detection system and method |
| CN114162331A (en) * | 2022-02-14 | 2022-03-11 | 中国空气动力研究与发展中心低速空气动力研究所 | Icing detection device and icing detection method |
| CN115525080A (en) * | 2022-11-23 | 2022-12-27 | 北京昆仑海岸科技股份有限公司 | Anti-icing control method and system based on temperature monitoring |
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Application publication date: 20100804 |