CN109632664B - Device for mounting optical probe under high temperature and vibration conditions - Google Patents
Device for mounting optical probe under high temperature and vibration conditions Download PDFInfo
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- CN109632664B CN109632664B CN201811535921.2A CN201811535921A CN109632664B CN 109632664 B CN109632664 B CN 109632664B CN 201811535921 A CN201811535921 A CN 201811535921A CN 109632664 B CN109632664 B CN 109632664B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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Abstract
The invention relates to a device for installing an optical probe under high-temperature and vibration conditions, which is used for improving the precision and stability of an aero-engine fuel gas online detection technology and belongs to the field of probe installation under high-temperature and high-vibration complex environments. The device comprises a laser emitting device and a laser receiving device. The device has the advantages of precise platform, high precision, high temperature resistance and high vibration complex environment, and can improve the measurement precision and accuracy; the method can provide a technical means for the application of the spectral absorption technology in the complex environment of the engine. Most of the devices of the invention are installed in vacuum and are provided with cooling and vibration damping devices, thus greatly reducing the influence of the external environment on the measurement result, reducing the temperature diffusion of the engine combustion chamber, avoiding the damage of an optical probe, reducing the deviation of an optical system and realizing the high-precision monitoring of the gas characteristics of the engine combustion chamber by the spectral absorption technology.
Description
Technical Field
The invention relates to a device for installing an optical probe under high-temperature and vibration conditions, which is used for improving the precision and stability of an aero-engine fuel gas online detection technology and belongs to the field of probe installation under high-temperature and high-vibration complex environments.
Background
In an aerospace engine, measurement of state quantities such as gas components and concentration in a high-temperature environment is very important for understanding combustion conditions in the engine, and is also an important basis for optimizing combustion organization and structure. At present, gas measurement is mostly to draw out the back with gas in the engine combustion chamber, measures the mode that detects again, and normal position real-time detection can't be realized to this method to require a plurality of devices to cooperate, system architecture is complicated. However, the in-situ measurement technology based on absorption spectroscopy under the ultra-high temperature condition is to utilize molecules in a region to be measured to absorb incident light and calculate the gas concentration according to the change condition of the light intensity after absorption, has the characteristics of non-contact type, multi-state parameters, wide measuring range, high precision, good dynamic response, miniaturization and the like, can realize the measurement of parameters such as components, concentration, temperature, pressure intensity, density and the like, and is particularly suitable for the detection of gas parameters in a high-temperature severe environment. However, the complex environment of high temperature and high vibration of the engine combustion chamber brings great difficulty to the installation of the optical probe, and how to protect the optical components and collimate the optical signals plays an important role in improving the signal-to-noise ratio and stability of the system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-precision optical probe mounting device under the conditions of high temperature and vibration, which is used for collimating and mounting the optical path of an engine gas characteristic online detection system.
The invention adopts the following technical scheme for solving the problems:
the device comprises a laser emitting device and a laser receiving device,
the laser emitting device is arranged at the incident end of the combustion chamber of the tested engine and is used for installing a device for generating a laser signal; the laser emitting device comprises a vacuum flange, a vacuum cavity, a wedge-shaped window vacuum flange, a corrugated cavity and a solid base; the vacuum cavity comprises a cooling hollow cavity and a cylindrical cavity; the cylindrical cavity comprises a collimating lens and a filter plate;
one end of a vacuum flange is connected with one end of a vacuum cavity, the other end of the vacuum cavity is connected with one end of a wedge-shaped window vacuum flange, a sapphire window is formed in the wedge-shaped window vacuum flange, the other end of the wedge-shaped window vacuum flange is connected with one end of a corrugated cavity, the other end of the corrugated cavity is connected with an inlet of a combustion chamber of an engine to be tested, a cooling hollow cavity is wrapped outside a cylindrical cavity, and collimating lenses and filters are sequentially arranged and installed in the cylindrical cavity;
the laser receiving device is arranged at the outlet end of the combustion chamber of the engine and is used for installing a device for receiving a laser signal; the laser receiving device comprises a vacuum flange, a vacuum cavity, a wedge-shaped window vacuum flange, a corrugated cavity and a solid base; the vacuum cavity comprises a cooling hollow cavity and a cylindrical cavity; the cylindrical cavity comprises a coupling lens and a filter plate; one end of a vacuum flange is connected with one end of a vacuum cavity, the other end of the vacuum cavity is connected with one end of a wedge-shaped window vacuum flange, a sapphire window is formed in the wedge-shaped window vacuum flange, the other end of the wedge-shaped window vacuum flange is connected with one end of a corrugated cavity, the other end of the corrugated cavity is connected with an outlet of a combustion chamber of a tested engine, a cooling hollow cavity is wrapped outside a cylindrical cavity, and a coupling lens and a filter plate are sequentially arranged and installed in the cylindrical cavity;
the bottom parts of the vacuum cavities of the laser emitting device and the laser receiving device are both fixedly arranged on the solid base.
The inner side of the vacuum flange is provided with a three-dimensional adjusting frame, and a laser probe in a device for generating laser signals is connected with the three-dimensional adjusting frame so as to realize the collimation of light beams and the adjustment of a transmission path.
The filter plate of the laser transmitting device is matched with the collimating lens, so that laser signals of specific wave bands are effectively transmitted in the measured gas, and the coupling lens of the laser receiving device is matched with the filter plate to realize the convergence of the laser signals, so that the laser signals of the specific wave bands enter the receiving detector.
The cylindrical cavity of the laser transceiver is in a vacuum state.
The corrugated cavity is made of stainless steel.
The solid base is made of stainless steel.
The invention has the advantages and beneficial effects that,
the invention has the beneficial effects that: the device has the advantages of precise platform, high precision, high temperature resistance and high vibration complex environment, and can improve the measurement precision and accuracy; the method can provide a technical means for the application of the spectral absorption technology in the complex environment of the engine. Most of the devices of the invention are installed in vacuum and are provided with cooling and vibration damping devices, thus greatly reducing the influence of the external environment on the measurement result, reducing the temperature diffusion of the engine combustion chamber, avoiding the damage of an optical probe, reducing the deviation of an optical system and realizing the high-precision monitoring of the gas characteristics of the engine combustion chamber by the spectral absorption technology.
1. The accuracy and precision of the laser emission signal and the laser receiving signal are improved, the influence of high temperature and high vibration of a combustion chamber of an engine on a system is overcome, and the accuracy and precision of the analysis of the gas characteristics of the combustion chamber are ensured;
2. the mounting shell design of the transmitting device and the receiving device and the interface design of the two devices and the engine are designed aiming at the characteristics of high temperature and high vibration of the combustion chamber of the engine, so that the devices have the characteristics of synchronous vibration, high temperature resistance and the like of the combustion chamber shell;
3. the transmitting device and the receiving device comprise a cooling hollow cavity as a cooling unit, and the unit can play a role in cooling the whole device and prevent the high-temperature environment of the engine from damaging the device.
4. The filter plate of the transmitting device is matched with the collimating lens, so that the laser signals of specific wave bands are effectively transmitted in the measured gas, and the coupling lens of the laser receiving device is matched with the filter plate to realize the convergence of the laser signals, so that the laser signals of the specific wave bands enter the receiving detector. Finally, the signal-to-noise ratio and the measurement accuracy of the system are improved.
Drawings
FIG. 1 is a general frame diagram showing the general frame of a high-precision optical probe mounting device under high temperature and vibration conditions;
FIG. 2 is a design drawing of a vacuum flange of the laser emitting device;
FIG. 3 is a design drawing of a vacuum flange of the laser receiver;
FIG. 4 is a design drawing of a vacuum chamber of the laser transceiver;
FIG. 5 is a wedge window vacuum flange layout;
fig. 6 is a hollow screw nut design.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention provides a device for mounting an optical probe under high temperature and vibration conditions, which is used for adapting to the complex environment of high temperature and high vibration of an engine by the optical probe and improving the system precision. The laser emitting device a is arranged at the incident end of the combustion chamber of the engine and is used for installing a device for generating a laser signal; the laser emission device comprises a vacuum flange 1, a vacuum cavity 2, a wedge-shaped window vacuum flange 3 and a corrugated cavity 4, wherein a cooling hollow cavity air inlet and outlet port 10/11, an optical fiber flange interface 6, a vacuum cavity interface 9 and a three-dimensional adjusting frame control interface 8 are reserved on the outer surface of the vacuum flange; the vacuum cavity comprises a cylindrical cavity 15 and a cooling hollow cavity 16; the cylindrical cavity contains a collimating lens 17 and a filter plate 19.
The laser receiving device b is arranged at the outlet end of the combustion chamber of the engine and is used for installing a device for receiving a laser signal; the laser signal receiving device comprises a vacuum flange 1, a vacuum cavity 2, a wedge-shaped window vacuum flange 3 and a corrugated cavity 4, wherein the outer surface of the vacuum flange is provided with a cooling hollow cavity air inlet and outlet, a cable interface and a vacuum cavity interface; wherein the outer surface of the vacuum flange is provided with a cooling hollow cavity air inlet and outlet port 10/11, a cable interface 6 and a vacuum cavity interface 9; the vacuum cavity comprises a cylindrical cavity 15 and a cooling hollow cavity 16; the cylindrical cavity contains a coupling lens 18 and a filter plate 19.
The invention provides a tunable laser aeroengine gas characteristic analysis system signal transmitting and receiving anti-vibration device which comprises a corrugated cavity 4 and a solid base 5, wherein the shells of a transmitting device a and a receiving device b are connected with the solid base 5, so that the vibration synchronization of two ends is realized, the consistency of the relative positions of a transmitting signal and a receiving signal is ensured, and the system test precision is improved.
The invention provides a special cylindrical cavity for a mounting device for transmitting and receiving signals of a tunable laser aeroengine fuel gas characteristic analysis system, wherein a filter plate and a collimating lens 17 (laser transmitting device)/a coupling lens 18 (laser receiving device) are arranged in the cylindrical cavity, and the cylindrical cavity comprises two clamping grooves 20 for fixing the filter plate 19, the collimating lens 17 (laser transmitting device)/the coupling lens 18 (laser receiving device).
In a further improvement, the sapphire window is made of high-temperature refractory sapphire.
In a further improvement, the material of the transmitting device and the receiving device is stainless steel, and the transmitting device and the receiving device have high temperature resistance.
In further improvement, the vacuum cavity 2 has the characteristic of high integration, a plurality of interfaces are integrated on the outer surface of the flange, the complexity of the system is simplified, and the processing efficiency of the system is improved.
The corrugated cavity 4 is further improved, the used material is stainless steel, the corrugated cavity has a high-temperature resistant effect, and the structure is a spiral soft structure, so that the corrugated cavity can play a role in vibration reduction and buffering, and the influence of high vibration on an optical system is reduced; in addition, the solid base 5 is made of stainless steel, so that the solid base has a high-temperature resistant effect, and the transmitting and receiving device is connected with the solid base 5, so that the vibration consistency of the transmitting and receiving device can be ensured, the consistency of optical paths at two ends can be ensured, and the vibration reduction and buffering effects can be indirectly realized.
Examples
Fig. 1 is a specific embodiment of a high-precision optical probe mounting device under high temperature and vibration conditions, and includes a left laser emitting device a and a right laser receiving device b, wherein the two-end devices include a vacuum flange 1, a vacuum cavity 2, a wedge-shaped window vacuum flange 3, and a corrugated cavity 4, and 8 through holes are uniformly distributed at two ends of the vacuum flange 1, the vacuum cavity 2, the wedge-shaped window vacuum flange 3, and the corrugated cavity 4. One end of a vacuum flange 1 is connected with one end of a vacuum cavity 2, the other end of the vacuum cavity 2 is connected with one end of a wedge-shaped window vacuum flange 3, and a sapphire window 22 is formed in the vacuum cavity, so that light beams can effectively enter the combustion chamber; the other end of the wedge-shaped window vacuum flange 3 is connected with the corrugated cavity. Meanwhile, the bottoms of the vacuum cavities 2 of the laser emitting device and the laser receiving device are fixedly arranged on the solid base 5, so that the vibration consistency of the receiving and transmitting ends is ensured, the vibration-proof effect is indirectly achieved, and the system stability is improved.
Fig. 2 is a laser emitting device a and fig. 3 is a design drawing of a vacuum flange of a laser receiving device b, the design of the emitting device and the receiving device is basically consistent, and the emitting device and the receiving device comprise an optical fiber interface 6 (a cable interface 7 of the laser receiving device) of the laser emitting device, a three-dimensional adjusting frame control interface 8 (the laser receiving device is not provided), a vacuumizing interface 9, a cooling hollow cavity air inlet/outlet interface 10/11 and eight through holes 12 of an M6. The vacuumizing interface 9 is used for vacuumizing the vacuum cavity, the three-dimensional adjusting frame control interface 8 is mainly used for realizing three-dimensional control of the adjusting frame, the optical fiber interface 6 of the laser receiving device is used for connecting a laser probe, and the cable interface 7 of the laser emitting device is used for connecting a photoelectric probe. In addition, the three-dimensional adjusting frame 13 of the laser emitting device is arranged on the inner surface of a vacuum flange of the laser emitting device, and four through holes are formed in the three-dimensional adjusting frame 13 and used for fixing a laser probe and adjusting a light path, so that a laser signal can pass through a combustion chamber and be detected by a detector. The opto-electronic probe mount is fixed 14 to the inner surface of the vacuum flange of the receiving device for fixing the opto-electronic probe.
Fig. 4 is a design diagram of a vacuum cavity of a laser transmitting and receiving device, wherein the laser transmitting device and the laser receiving device are basically designed in the same manner and are both cylindrical. Comprises a cylindrical cavity 15 and a cooling hollow cavity 16, wherein the outer side of the vacuum cavity is provided with a cooling gas inlet 10 and a cooling gas outlet 11; the hollow cavity 16 for cooling is wrapped on the periphery of the cylindrical cavity 15 to play a role in cooling the system, and the inside of the cylindrical cavity 15 is in a vacuum environment. Laser transceiver filter 19, laser emitter collimating lens 17 and laser receiver coupling lens 18 pass through draw-in groove 20 to be fixed inside cylindrical cavity 15, and filter 19 plays the effect of filtering out stray light outside the infrared laser wave band, and laser receiver coupling lens 18 plays and collects laser to improve system signal to noise ratio.
FIG. 5 is a design drawing of a wedge window vacuum flange 3 with a 50mm diameter sapphire window 22 in the middle of the wedge sapphire flange;
fig. 6 shows a design of a hollow screw nut 21, wherein a sapphire window 22 is fastened to the flange by means of the hollow screw nut 21.
Claims (6)
1. An apparatus for mounting an optical probe under high temperature and vibration conditions, comprising:
the device comprises a laser emitting device and a laser receiving device,
the laser emitting device is arranged at the incident end of the combustion chamber of the tested engine and is used for installing a device for generating a laser signal; the laser emitting device comprises a vacuum flange (1), a vacuum cavity (2), a wedge-shaped window vacuum flange (3), a corrugated cavity (4) and a solid base (5); the vacuum cavity comprises a cooling hollow cavity (16) and a cylindrical cavity (15); the cylindrical cavity comprises a collimating lens (17) and a filter plate (19);
one end of a vacuum flange (1) is connected with one end of a vacuum cavity (2), the other end of the vacuum cavity (2) is connected with one end of a wedge-shaped window vacuum flange (3), a sapphire window (22) is formed in the wedge-shaped window vacuum flange (3), the other end of the wedge-shaped window vacuum flange (3) is connected with one end of a corrugated cavity (4), the other end of the corrugated cavity (4) is connected with an inlet of a combustion chamber of a tested engine, a cooling hollow cavity (16) is wrapped outside a cylindrical cavity (15), and a collimating lens (17) and a filter plate (19) are sequentially arranged and installed in the cylindrical cavity (15);
the laser receiving device is arranged at the outlet end of the combustion chamber of the engine and is used for installing a device for receiving a laser signal; the laser receiving device comprises a vacuum flange (1), a vacuum cavity (2), a wedge-shaped window vacuum flange (3), a corrugated cavity (4) and a solid base (5); the vacuum cavity comprises a cooling hollow cavity (16) and a cylindrical cavity (15); the cylindrical cavity comprises a coupling lens (18) and a filter plate (19); one end of a vacuum flange (1) is connected with one end of a vacuum cavity (2), the other end of the vacuum cavity (2) is connected with one end of a wedge-shaped window vacuum flange (3), a sapphire window (22) is formed in the wedge-shaped window vacuum flange (3), the other end of the wedge-shaped window vacuum flange (3) is connected with one end of a corrugated cavity (4), the other end of the corrugated cavity (4) is connected with an outlet of a combustion chamber of a tested engine, a cooling hollow cavity (16) is wrapped outside a cylindrical cavity (15), and a coupling lens (18) and a filter plate (19) are sequentially arranged and installed in the cylindrical cavity (15);
the bottoms of the vacuum cavities (2) of the laser emitting device and the laser receiving device are fixedly arranged on the solid base (5) and are used for realizing the vibration synchronization of the two ends so as to ensure the consistency of the relative positions of the emitted signal and the received signal;
the laser emitting device and the laser receiving device respectively comprise a cooling hollow cavity (16) as a cooling unit, and the devices installed in the laser emitting device and the laser receiving device have the function of overall cooling, so that the devices are prevented from being damaged by the high-temperature environment of an engine.
2. The device for mounting an optical probe under high temperature and vibration conditions as claimed in claim 1, wherein the vacuum flange is provided with a three-dimensional adjusting frame (13) inside, and the laser probe of the device for generating laser signals is connected with the three-dimensional adjusting frame (13) to realize the collimation of the light beam and the adjustment of the transmission path.
3. The apparatus of claim 1, wherein the filter of the laser transmitter is coupled to the collimating lens to effectively transmit the laser signal of a specific wavelength band in the measured gas, and the coupling lens of the laser receiver is coupled to the filter to converge the laser signal so that the laser signal of a specific wavelength band enters the receiving detector.
4. The apparatus of claim 1, wherein the cylindrical cavities of the laser emitting device and the laser receiving device are in a vacuum state.
5. An apparatus for mounting an optical probe under high temperature and vibration conditions as claimed in claim 1, wherein the corrugated chamber is made of stainless steel.
6. An apparatus as claimed in claim 1, wherein the solid base is made of stainless steel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811535921.2A CN109632664B (en) | 2018-12-14 | 2018-12-14 | Device for mounting optical probe under high temperature and vibration conditions |
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| CN201811535921.2A CN109632664B (en) | 2018-12-14 | 2018-12-14 | Device for mounting optical probe under high temperature and vibration conditions |
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| CN109632664A CN109632664A (en) | 2019-04-16 |
| CN109632664B true CN109632664B (en) | 2022-01-18 |
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| CN113865877A (en) * | 2021-10-26 | 2021-12-31 | 华能国际电力股份有限公司 | Laser emission probe installation device suitable for combustion monitoring of gas turbine |
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| US20160176780A9 (en) * | 2005-05-16 | 2016-06-23 | Dow Global Technologies Llc | Excess air control for cracker furnace burners |
| CN103134773B (en) * | 2013-02-06 | 2015-08-05 | 北京东方计量测试研究所 | TDLAS temperature survey and calibration vacuum chamber |
| CN103852445B (en) * | 2014-03-19 | 2015-06-24 | 中国人民解放军装备学院 | Design method of optical probe for measuring laser absorption spectrum |
| CN203848856U (en) * | 2014-05-19 | 2014-09-24 | 国家电网公司 | Ammonia measuring instrument fixation device |
| CN104950007A (en) * | 2015-07-14 | 2015-09-30 | 西安近代化学研究所 | Solid-propellant ignition and burning speed integrated testing device |
| CN107064060B (en) * | 2017-03-13 | 2019-04-12 | 中国人民解放军战略支援部队航天工程大学 | A kind of fiber array optic probe for the field measurement that burns |
| CN207379917U (en) * | 2017-11-16 | 2018-05-18 | 中北大学 | Aero-engine gas component and density monitoring system |
| CN111001812B (en) * | 2019-11-28 | 2022-05-24 | 西安航天发动机有限公司 | Heat treatment method for additive manufacturing high-temperature alloy working in high-temperature gas environment |
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