CN114152210A - Synchronous measurement system for surface deformation and pressure distribution of rotating part - Google Patents
Synchronous measurement system for surface deformation and pressure distribution of rotating part Download PDFInfo
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- CN114152210A CN114152210A CN202111636957.1A CN202111636957A CN114152210A CN 114152210 A CN114152210 A CN 114152210A CN 202111636957 A CN202111636957 A CN 202111636957A CN 114152210 A CN114152210 A CN 114152210A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
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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
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
- G01N21/64—Fluorescence; Phosphorescence
- G01N21/645—Specially adapted constructive features of fluorimeters
- G01N21/6456—Spatial resolved fluorescence measurements; Imaging
Abstract
The invention relates to the technical field of surface deformation and pressure distribution measurement of a rotating part, in particular to a synchronous measurement system for surface deformation and pressure distribution of the rotating part. The system comprises a laser light source module, an image acquisition module, a synchronous control module and a rotating component carrier; the laser light source module is a laser light source capable of outputting 10ns pulse width; the image acquisition module comprises two frame-spanning CCD cameras, and the two frame-spanning CCD cameras acquire two images within a set time interval; the synchronous control module is used for providing a trigger signal of the laser light source module and an acquisition signal of the image acquisition module; the rotating component carrier comprises a rotating component to be measured, wherein the surface of the rotating component to be measured is provided with PSP paint and speckle mark points. The system effectively controls the motion blur of the rotating part to make the image clearly visible; phase locking of the high-speed rotating member is achieved.
Description
Technical Field
The invention relates to the technical field of surface deformation and pressure distribution measurement of a rotating part, in particular to a synchronous measurement system for surface deformation and pressure distribution of the rotating part.
Background
Rotary machines such as helicopter rotors, air and underwater propellers, compressor rotors, turbine blades and the like are widely applied to the field of aerospace as important components of power propulsion systems. The components are characterized by high rotating speed, the surface pressure distribution and deformation of the components are parameters which are very concerned generally, but the traditional measuring method is difficult to be applied to the measurement of the surfaces and space fields of the moving and rotating bodies, and an intuitive and effective measuring method for multiple physical parameters of the complicated flow field of the rotating machine is lacked.
Three-dimensional Digital Speckle Correlation Method (3D-DSCM) is an optical measurement technique used to measure vibrations of a model surface. The DSCM is also called a Digital Image Correlation (DIC) method, which is a novel optical measurement method for obtaining object motion and deformation information based on the gray scale feature analysis of speckle images on the surface of an object. Compared with the traditional optical measurement technology, the method has the advantages of full-field measurement, non-contact, high precision, relatively simple optical path, adjustable measurement view field, no special requirement on the measurement environment and the like. But since it uses only a single camera, only two-dimensional (in-plane) displacement information of a planar object is obtained. Compared with the DSCM, the 3D-DSCM combining the binocular vision technology and the DSCM has the advantages that the three-dimensional shape of the surface of a plane or curved surface model and the three-dimensional deformation under the action of load can be measured. The method comprises the steps of utilizing two cameras to image the surface of a measured object from different angles, firstly calibrating the two cameras to obtain internal and external parameters of the cameras, and then directly utilizing a relevant matching algorithm in the DSCM to obtain the parallax of corresponding points in a left image and a right image. And recovering the three-dimensional appearance of the object surface from the parallax data and the calibration parameters of each point, and comparing the three-dimensional appearance change of each point in the measurement area before and after deformation to obtain the three-dimensional displacement distribution of the whole field.
PSP is a pressure sensitive paint based on luminescent oxygen quenching developed in 80 s of the 20 th century for measuring surface pressure, and the paint can emit fluorescence after being irradiated by light with a certain wavelength, and an emitted light intensity field is measured, so that a corresponding pressure distribution can be calculated. Compared with the conventional manometric hole method, the manometric paint manometric can provide the pressure distribution of the whole model surface and will not interfere with the flow field; detailed flow characteristics of complex flows can be captured; the small-size model and the pressure distribution of the thin airfoil surface which cannot be provided by the pressure measuring hole can be provided; a model with many pressure taps need not be manufactured and can be performed simultaneously with many routine measurement experiments.
Disclosure of Invention
The invention aims to provide a synchronous measuring system for surface deformation and pressure distribution of a rotating component, which can solve the problems of surface deformation and pressure measurement of the rotating component;
the invention provides a synchronous measurement system for surface deformation and pressure distribution of a rotating part, which comprises a laser light source module, an image acquisition module, a synchronous control module and a rotating part carrier, wherein the laser light source module is used for acquiring an image;
the laser light source module is a laser light source capable of outputting 10ns pulse width;
the image acquisition module comprises two frame-spanning CCD cameras, and the two frame-spanning CCD cameras acquire two images within a set time interval;
the synchronous control module is used for providing a trigger signal of the laser light source module and an acquisition signal of the image acquisition module;
the rotating component carrier comprises a rotating component to be measured, wherein the surface of the rotating component to be measured is provided with PSP paint and speckle mark points.
Preferably, the laser light source module includes a laser light source and a cone light source, and the cone light source is disposed at a front end of the laser light source.
Preferably, the laser light source adopts a 532nm single-pulse laser, and the single-pulse width is 10ns +/-2 ns;
when the irradiation area A is more than 0.25m2When the energy of the single pulse is required to be more than or equal to 500 mJ;
if a 532nm dual cavity pulse laser is used, the second cavity pulse is not required to be triggered.
Preferably, the equivalent focal length f of the optical system of the cone-shaped light source is determined according to the required irradiation area a, the beam diameter d and the shooting distance L and according to the relationship between the equivalent focal length of the concave mirror and the diffusion angle as follows:
preferably, a lens is arranged on the frame-crossing CCD camera, and a filter is arranged on the lens.
Preferably, the resolution of the frame-crossing CCD camera is larger than 2048 pixels × 2048 pixels, the gray scale is at least 12 bits, and the minimum frame-crossing distance can be adjusted to be less than 1 μ s.
Preferably, when a 532nm laser light source and a PSP coating of PtFPP probe molecules are adopted, a 645nm +/-20 nm filter is selected;
when the light intensity is insufficient, the bandwidth of the filter is widened as required, but the lowest passing wavelength is not lower than 565 nm.
Preferably, the synchronous control module mainly comprises an infrared photoelectric switch and a high-precision synchronizer; the infrared photoelectric switch detects the motion phase of the rotating part by emitting and receiving the reflected light of the rotating part, and simultaneously provides a high-level pulse signal for the high-precision synchronizer, and the high-precision synchronizer provides a laser light source trigger signal and a cross-frame camera acquisition signal by detecting the rising edge of the high-level pulse signal.
Preferably, when the cooperative repetitive operation frequency fc of the laser light source and the cross-frame CCD camera is lower, the frequency division processing is carried out on the output signal of the high-precision synchronizer, and the frequency division coefficient alpha f is more than or equal to fx/fc.
Preferably, the speckle equivalent diameter ds and the duty ratio gamma are determined by the performance calculated by the PSP and the area Ad to be shot of the rotating component to be measured, and under the condition that Ad is less than or equal to 0.144m2, ds is less than or equal to 1mm, and gamma is less than or equal to 0.05.
Has the advantages that:
the cross-frame CCD camera can rapidly acquire two images within a very short time interval, the laser light source can output a laser light source with a pulse width of 10ns, the fluorescence life of PSP photosensitive molecules is 10-50 microseconds, two frames of PSP fluorescence images are rapidly captured after laser pulse irradiation by controlling the cross-frame time of the cross-frame CCD camera, surface pressure distribution is obtained by using a fluorescence life method, and motion blur of a rotating part can be effectively controlled due to two exposures at the microsecond level, so that the images are clear and visible.
Because the cross-frame CCD camera and the laser light source need to be strictly and synchronously operated, the repetition frequency is low and is far lower than the rotation frequency of the rotating component, a synchronous control module needs to be introduced, shooting is carried out after the rotating component reaches a specific phase, and phase locking of the high-speed rotating component can be realized.
The PSP coating with the marked speckles is sprayed on the rotating surface to be measured, two cross-frame CCD cameras can obtain a PSP image with the speckles, wherein speckle position information is used for 3D-DSCM surface deformation calculation, the PSP image is used for surface pressure calculation, but the PSP image adopts a corrosion expansion method to close a speckle area, so that pressure distribution is continuous and complete.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a system for synchronously measuring surface deformation and pressure distribution of a rotating component according to an embodiment of the present invention;
FIG. 2 is a timing diagram of a system for synchronously measuring surface deformation and pressure distribution of a rotating component according to an embodiment of the present invention.
Description of reference numerals:
YAG laser light source, 2 laser beam, 3 cone light source, 4 cone beam, 5-1 left side frame-spanning CCD camera, 5-2 right side frame-spanning CCD camera, 6-1 left side lens, 6-2 right side lens, 7-1 left side filter, 7-2 right side filter, 8 rotating part to be measured, 9 rotating part rotating shaft, 10 infrared photoelectric switch, 11 high precision synchronizer;
t1 is a trigger signal of an infrared photoelectric switch, T2 is a laser light source pulse signal, delta T1 is a system delay from the trigger signal of the infrared photoelectric switch to the laser light source pulse, Image1 is an exposure interval of first frame Image shooting of a cross-frame CCD camera, Image2 is an exposure interval of second frame Image shooting of the cross-frame CCD camera, delta T2 is two-frame exposure time interval of the cross-frame CCD camera, and a shadow area and a curve are curves of fluorescence intensity of PSP stimulated radiation along with time.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a system for synchronously measuring surface deformation and pressure distribution of a rotating component, which includes a laser light source module, an image acquisition module, a synchronous control module, and a rotating component carrier.
The laser light source module is a laser light source capable of outputting 10ns pulse width.
The image acquisition module comprises two frame-crossing CCD cameras which acquire two images within a set time interval.
The synchronous control module is used for providing a trigger signal of the laser light source module and an acquisition signal of the image acquisition module.
The rotating component carrier comprises a rotating component to be measured, wherein the surface of the rotating component to be measured is provided with PSP coating and speckle mark points.
The cross-frame CCD camera can rapidly acquire two images within a very short time interval, the laser light source can output a laser light source with a pulse width of 10ns, the fluorescence life of PSP photosensitive molecules is 10-50 microseconds, two frames of PSP fluorescence images are rapidly captured after laser pulse irradiation by controlling the cross-frame time of the cross-frame CCD camera, surface pressure distribution is obtained by using a fluorescence life method, and motion blur of a rotating part can be effectively controlled due to two exposures at the microsecond level, so that the images are clear and visible.
Because the cross-frame CCD camera and the laser light source need to be strictly and synchronously operated, the repetition frequency is low and is far lower than the rotation frequency of the rotating component, a synchronous control module needs to be introduced, shooting is carried out after the rotating component reaches a specific phase, and phase locking of the high-speed rotating component can be realized.
The PSP coating with the marked speckles is sprayed on the rotating surface to be measured, two cross-frame CCD cameras can obtain a PSP image with the speckles, wherein speckle position information is used for 3D-DSCM surface deformation calculation, the PSP image is used for surface pressure calculation, but the PSP image adopts a corrosion expansion method to close a speckle area, so that pressure distribution is continuous and complete.
In the present embodiment, an FD-03 wind tunnel optical flow velocity measurement is taken as an example, and a synchronous measurement system for surface deformation and pressure distribution of a rotating member will be further described. The specific description is as follows:
laser light source module
The laser light source module mainly comprises an Nd: YAG laser light source 1 and a cone light source 3, and a laser beam 2 emitted by the Nd: YAG laser light source 1 is modulated into a cone beam 4 through the cone light source 3. Wherein, the Nd: YAG laser light source 1 is preferably a 532nm single-pulse Nd: YAG laser, the single-pulse width is 10ns +/-2 ns, and the required irradiation area A is more than 0.25m2When the energy of the single pulse is required to be more than or equal to 500 mJ; if a 532nm double-cavity pulse Nd-YAG laser is adopted, the second cavity pulse is not required to be triggered; the equivalent focal length f of the optical system of the cone-shaped light source 3 is determined according to the required irradiation area A, the beam diameter d and the shooting distance L and according to the relation between the equivalent focal length of the concave mirror and the diffusion angle as follows:
image acquisition module
The image acquisition module mainly comprises two sets of frame-crossing CCD cameras 5-1 and 5-2, lenses 6-1 and 6-2 and filters 7-1 and 7-2, wherein the frame-crossing CCD cameras preferably adopt high-quality CCD cameras with high resolution, high image gray level and low frame-crossing interval, the resolution is recommended to be more than 2048 pixels multiplied by 2048 pixels, the gray level is recommended to be 12 bits, the minimum frame-crossing interval is recommended to be adjusted to be less than 1 mu s, the lenses are selected according to the shooting distance and the shooting area, the filters are selected according to the illumination wavelength of a laser source and the radiation wavelength of a PSP image, particularly, PSP coatings of 532nm laser source and PtFPP probe molecules are selected, and 645nm +/-20 nm filters are preferably selected, when the light intensity is insufficient, the bandwidth of the filters can be properly widened, but the lowest passing wavelength is not lower than 565 nm.
Synchronous control module
The synchronous control module mainly comprises an infrared photoelectric switch 10 and a high-precision synchronizer 11, wherein the infrared photoelectric switch 10 detects the motion phase of a rotating component by emitting and receiving reflected light of the rotating component, and simultaneously provides a high-level pulse signal for the high-precision synchronizer 11, and the high-precision synchronizer 11 provides a trigger signal of the Nd: YAG laser light source 1 and an acquisition signal of the frame-crossing CCD camera 5-15-2 by detecting the rising edge of the high-level pulse signal.
Particularly, when the cooperative repetitive working frequency fc of the Nd-YAG laser light source 1 and the two frame-spanning CCD cameras 5-1 and 5-2 is lower, the rotating frequency fx of a rotating component cannot be matched and tracked completely, at the moment, software is utilized to carry out frequency division processing on an output signal of the high-precision synchronizer 11, and the frequency division coefficient alpha f is more than or equal to fx/fc, so that the Nd-YAG laser light source 1 and the two frame-spanning CCD cameras 5-1 and 5-2 can be ensured to capture effective image data
Rotating part carrier
The rotating component carrier mainly comprises a rotating component 8 to be measured and a rotating component rotating shaft 9, wherein the surface of the rotating component 8 to be measured needs to be sprayed with a high-sensitivity PSP coating, and speckle mark points are arranged on the surface after the coating is formed. Wherein speckle position information is used for 3D-DSCM surface deformation calculation, PSP image is used for surface pressure calculation, but PSP image adopts corrosion expansion method to close speckle area, so that pressure distribution is continuous and complete.
The speckle equivalent diameter ds and the duty ratio gamma are determined by the performance calculated by the PSP and the area Ad to be shot of the rotating part 8 to be measured, and the Ad is generally less than or equal to 0.144m2Under the condition (1), ds is preferably not more than 1mm, and γ is not more than 0.05.
The working principle and the time sequence of the supersonic flow field optical flow velocity measurement system are as follows.
Firstly, operating a rotating component 8 to be measured, enabling an Nd-YAG laser light source 1, two cross-frame CCD cameras 5-1 and 5-2 and a high-precision synchronizer 11 to be in a working state, installing an infrared photoelectric switch 10 and aligning to a running area of the rotating component 8 to be measured, when the rotating component 8 to be measured runs to a specific phase, the infrared photoelectric switch 10 outputs a high-level trigger signal T1, after a system delay delta T1, the high-precision synchronizer 11 outputs a signal T2 to trigger the Nd-YAG laser light source 1 and the two cross-frame CCD cameras 5-1 and 5-2 to work, wherein the two cross-frame CCD cameras 5-1 and 5-2 firstly shoot a first frame Image, an exposure interval is Image1, a delta T2 time interval is elapsed, and then a second frame Image is shot, and the exposure interval is Image 2.
In order to ensure the PSP image calculation effect based on the life-span method, the time interval of the delta t2 is controlled to ensure that the gray scale ratio lambda I of the first frame image I1 and the second frame image I2 meet the following relation as much as possible: λ I ═ I1/I2 ≈ 0.7.
In summary, the following steps: the synchronous measurement system for the surface deformation and the pressure distribution of the rotating part provided by the embodiment can realize the following purposes:
(1) establishment of 3D-DSCM binocular layout and PSP observation layout based on fluorescence lifetime method
Two frame-crossing CCD cameras and Nd-YAG laser light sources are introduced to replace the traditional camera and a continuous light source, and a 3D-DSCM binocular layout and a PSP observation layout based on a fluorescence lifetime method are established. The frame-spanning CCD camera can rapidly acquire 2 images within a very short time interval (as low as 200ns interval), the Nd: YAG laser source can output a laser source with a pulse width of 10ns, the fluorescence lifetime of PSP photosensitive molecules is 10-50 microseconds, two frames of PSP fluorescence images can be rapidly captured after irradiation of Nd: YAG laser pulses by controlling the frame-spanning time of the frame-spanning CCD camera, and surface pressure distribution is obtained by using a fluorescence lifetime method. Because the two exposures are all in microsecond level, the motion blur of the rotating component can be effectively controlled, and the image is clear and visible.
(2) Phase lock for high speed rotating parts
Because the cross-frame CCD camera and the Nd-YAG laser light source need to be operated strictly and synchronously, the repetition frequency is low and is far lower than the rotation frequency of the rotating component, high-precision synchronous equipment and a photoelectric trigger switch need to be introduced, and shooting is carried out after the rotating component reaches a specific phase. The invention adopts the infrared sensing photoelectric switch and the high-precision synchronization equipment, and can realize the phase locking of the high-speed rotating part.
(3) Synchronous acquisition of high signal-to-noise ratio surface deformation and surface pressure image information
The PSP image with the speckles is obtained by two frame-spanning CCD cameras, wherein speckle position information is used for calculating surface deformation of the 3D-DSCM, the PSP image is used for calculating surface pressure, but the PSP image adopts a corrosion expansion method to close the speckle area, so that the pressure distribution is continuous and complete.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A synchronous measurement system for surface deformation and pressure distribution of a rotating part is characterized by comprising a laser light source module, an image acquisition module, a synchronous control module and a rotating part carrier;
the laser light source module is a laser light source capable of outputting 10ns pulse width;
the image acquisition module comprises two frame-spanning CCD cameras, and the two frame-spanning CCD cameras acquire two images within a set time interval;
the synchronous control module is used for providing a trigger signal of the laser light source module and an acquisition signal of the image acquisition module;
the rotating component carrier comprises a rotating component to be measured, wherein the surface of the rotating component to be measured is provided with PSP paint and speckle mark points.
2. The system for synchronously measuring the surface deformation and the pressure distribution of the rotating component according to claim 1, wherein the laser light source module comprises a laser light source and a cone light source, and the cone light source is arranged at the front end of the laser light source.
3. A synchronous measurement system for surface deformation and pressure distribution of a rotating component as claimed in claim 2, wherein the laser source is a 532nm single pulse laser with a single pulse width of 10ns ± 2 ns;
when the irradiation area A is more than 0.25m2When the energy of the single pulse is required to be more than or equal to 500 mJ;
if a 532nm dual cavity pulse laser is used, the second cavity pulse is not required to be triggered.
4. A synchronous measurement system for surface deformation and pressure distribution of a rotating component according to claim 2, wherein the equivalent focal length f of the optical system of the cone-shaped light source is determined according to the relationship between the equivalent focal length of the concave mirror and the diffusion angle according to the required irradiation area a, the beam diameter d and the shooting distance L as follows:
5. the system for synchronously measuring the surface deformation and the pressure distribution of the rotating component according to claim 1, wherein a lens is arranged on the frame-crossing CCD camera, and a filter is arranged on the lens.
6. The system for synchronously measuring surface deformation and pressure distribution of a rotating component according to claim 5, wherein the resolution of the frame-crossing CCD camera is larger than 2048 pixels by 2048 pixels, the gray scale is at least 12 bits, and the minimum frame-crossing distance can be adjusted to be less than 1 μ s.
7. A synchronous measurement system for surface deformation and pressure distribution of a rotating component as claimed in claim 5, wherein when using a PSP coating of 532nm laser source and PtFPP probe molecules, a 645nm plus or minus 20nm filter is selected;
when the light intensity is insufficient, the bandwidth of the filter is widened as required, but the lowest passing wavelength is not lower than 565 nm.
8. The system for synchronously measuring surface deformation and pressure distribution of a rotating component according to claim 1, wherein the synchronous control module mainly comprises an infrared photoelectric switch and a high-precision synchronizer; the infrared photoelectric switch detects the motion phase of the rotating part by emitting and receiving the reflected light of the rotating part, and simultaneously provides a high-level pulse signal for the high-precision synchronizer, and the high-precision synchronizer provides a laser light source trigger signal and a cross-frame camera acquisition signal by detecting the rising edge of the high-level pulse signal.
9. The system for synchronously measuring the surface deformation and the pressure distribution of the rotating component as claimed in claim 8, wherein when the cooperative repetitive operation frequency fc of the laser light source and the cross-frame CCD camera is low, the frequency division processing is performed on the output signal of the high-precision synchronizer, and the frequency division coefficient α f is more than or equal to fx/fc.
10. The system for synchronously measuring the surface deformation and the pressure distribution of the rotating component as claimed in claim 1, wherein the speckle equivalent diameter ds and the duty ratio γ are determined by the performance calculated by the PSP and the area Ad to be shot of the rotating component to be measured, and under the condition that Ad is less than or equal to 0.144m2, ds is less than or equal to 1mm, and γ is less than or equal to 0.05.
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| CN114877869A (en) * | 2022-05-25 | 2022-08-09 | 中国航空工业集团公司沈阳空气动力研究所 | Motion blur suppression test system and working method thereof |
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| CN114877869A (en) * | 2022-05-25 | 2022-08-09 | 中国航空工业集团公司沈阳空气动力研究所 | Motion blur suppression test system and working method thereof |
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