CN109580092A - A kind of quick response pressure sensitive paint dynamic calibration apparatus and scaling method - Google Patents
A kind of quick response pressure sensitive paint dynamic calibration apparatus and scaling method Download PDFInfo
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- CN109580092A CN109580092A CN201811385657.9A CN201811385657A CN109580092A CN 109580092 A CN109580092 A CN 109580092A CN 201811385657 A CN201811385657 A CN 201811385657A CN 109580092 A CN109580092 A CN 109580092A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L27/00—Testing or calibrating of apparatus for measuring fluid pressure
- G01L27/002—Calibrating, i.e. establishing true relation between transducer output value and value to be measured, zeroing, linearising or span error determination
- G01L27/005—Apparatus for calibrating pressure sensors
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Abstract
A kind of quick response pressure sensitive paint dynamic calibration apparatus and scaling method, are related to aerospace experimental technique field, including fluidic oscillator, for providing oscillating jet to the print to be measured for being coated with pressure sensitive paint；Pressure sensor, in the action space of oscillating jet, for detecting the pressure of oscillating jet；Light source is motivated, for irradiating sample surface to be measured；Sample devices, for acquiring the light intensity signal of sample surface to be measured, the at least partly irradiation area of excitation light source is overlapped with the action space of the sampling area of sample devices and oscillating jet, it motivates light source or sample devices towards the outlet end of fluidic oscillator, and motivates the optical axis of light source perpendicular to the sample direction of sample devices；The light intensity signal of processor, pressure and sample devices acquisition for being detected according to pressure sensor carries out dynamic calibration to quick response pressure sensitive paint.
Description
Technical field
The invention belongs to aerospace experimental technique fields, mark more particularly, to a kind of quick response pressure sensitive paint dynamic
Determine device.
Background technique
In wind-tunnel and aircraft experiment, the quantitative measurment of surface pressing is the important side for understanding aerodynamic characteristics of vehicle
Method.Design for aircraft, surface pressure measurement are an indispensable contents, and to the characteristic for understanding flow field, analysis flies
The aerodynamic characteristic of machine and each component is very important, and is the important evidence of Flight Vehicle Design.Pressure distribution measurement provides very
The key message of more important flow phenomenon, such as profile of shock wave, position and flow separation.In addition, accurate pressure data is being tested
It is played a key role in card and confirmation turbulence model reliability, computation fluid dynamics codes and calculated result.
Pressure sensitive coating (Pressure Sensitive Paint, PSP) technology is a kind of based on luminous oxygen quenching
A kind of special pressure sensitive coating is covered on model surface, utilizes a standing wave by new optical surface pressure measurement method
After long light irradiation, coating stimulated radiation shines, and by measuring emitted luminescence intensity field, can calculate corresponding pressure distribution.For
Meet the needs of course of new aircraft and aerodynamics development, quick response PSP technology grows up, which is able to satisfy non-
Permanent wind tunnel test and capture large area pressure fluctuation demand, to shock-wave spot, breakout locations, shock wave boundary layer interaction and
The research for capturing the complicated phenomenons such as space vehicle dynamic aerodynamic characteristic provides global pressure distribution data and FLOW VISUALIZATION image.Due to
The difference of test model, formulation for coating material and manufacture craft, the response time of quick response PSP slightly have difference, and different tests item
The pressure sensitive paint that part and operating condition are suitble to is different, therefore, before test needs to carry out dynamic calibration and response time to quick response PSP
Measurement.The response time of PSP is generally demarcated by dynamic calibration system.Ideal dynamic calibration apparatus should provide sufficiently high
The pressure field information that quick response PSP is obtained under frequency, while being compared with canonical measure value, provide signal respective frequencies
Amplitude and phase lag information.Specific research contents and method bibliography: Xiang Xingju, Xiong Hongliang, Yuan Minglei etc., fast-response
PSP technology is used for the unsteady pressure measurement of hypersonic peripheral flow, experimental fluid mechanics, 2015,29 (3): 54-61.
Common dynamic calibration apparatus shock tube, i.e., form shock wave by rupture of membranes technology in several microseconds, generates faster
Pressure Step variation, however structure is complicated for shock tube, at high cost, technical risk is big, and the phase that can not provide frequency response data is sluggish
With amplitude dampening information.Another simple dynamic calibration method uses electromagnetic type dynamic calibration apparatus, is generated by switch
Pressure Step inside pressure vessel tests PSP time response, but reliability is relatively low, is limited by opening for system and solenoid valve
The response time is closed mostly in ms magnitude, is unable to satisfy the measurement demand of higher frequency.
Summary of the invention
The object of the present invention is to provide a kind of quick response pressure sensitive paint dynamic calibration apparatus and scaling methods, are shaken by jet stream
It swings device and test sample piece offer oscillating jet is provided, the dynamic light intensity signal for acquiring quick response pressure sensitive paint on print to be measured is converted into
Dynamic pressure signal, and compared with the dynamic pressure value of oscillating jet, it is special with the dynamic response for obtaining the quick response pressure sensitive paint
Property.
To achieve the goals above, the present invention provides a kind of quick response pressure sensitive paint dynamic calibration apparatus, comprising:
Fluidic oscillator, for providing oscillating jet to the print to be measured for being coated with pressure sensitive paint；
Pressure sensor, in the action space of the oscillating jet, for detecting the pressure of the oscillating jet；
Light source is motivated, for irradiating the sample surface to be measured；
Sample devices, for acquiring the light intensity signal or voltage signal of the sample surface to be measured, the excitation light source
At least partly irradiation area be overlapped with the action space of the sampling area of the sample devices and the oscillating jet, it is described
Motivate light source or the sample devices towards the outlet end of the fluidic oscillator, and the optical axis of the excitation light source is perpendicular to institute
State the sample direction of sample devices；
Processor, the light intensity signal of pressure and sample devices acquisition for being detected according to the pressure sensor
Dynamic calibration is carried out to the quick response pressure sensitive paint.
Preferably, according to the pressure of pressure sensor detection and the light intensity signal of sample devices acquisition to institute
Stating quick response pressure sensitive paint progress dynamic calibration includes:
The pressure signal with time series that the pressure sensor is detected is converted to reference spectrum figure；
It is converted according to the light intensity signal with time series that Stern-Volmer equation acquires the sample devices
At when m- pressure signal, and according to it is described when m- pressure signal be converted into acquisition spectrogram；
The acquisition spectrogram and the reference spectrum figure are compared, to carry out dynamic mark to the quick response pressure sensitive paint
It is fixed.
Preferably, the pressure sensor is set to the outlet end of the fluidic oscillator.
Preferably, the sample devices is high speed camera or photomultiplier tube.
Preferably, it is equipped with filter plate in front of the signal acquisition terminal of the sample devices, and the wavelength of the filter plate is
640nm-650nm。
Preferably, the excitation light source is pulsed LED light source, and the luminescence band of the pulsed LED light source is 360nm-
420nm is equipped with isochronous controller between the pulsed LED light source and the sample devices.
Preferably, the excitation light source is laser, and the luminescence band of the laser is 360nm-532nm.
Preferably, the sample frequency of the sample devices is consistent with the excitation luminous frequency of light source and is higher than described penetrate
Flow the intrinsic basic frequency of oscillator.
The present invention also provides a kind of quick response pressure sensitive paint dynamic calibrating methods, dynamic using above-mentioned quick response pressure sensitive paint
State caliberating device, which comprises
Step 1, the outlet that the print to be measured is placed in the fluidic oscillator, penetrate the print to be measured with described
It is parallel to flow the oscillating jet that oscillator provides；
The sample devices is connect by step 2 with the processor signal；
The pressure sensor is fixed on the print to be measured, and is located at the work of the oscillating jet by step 3
With in space, the pressure sensor is connect with the processor signal；
Step 4, after adjusting the oscillating jet to stabilization of the fluidic oscillator, oscillating jet is periodically put with certain frequency
Dynamic, the sample devices and the pressure sensor acquire light intensity signal and voltage signal respectively and are transferred to the processor
It is handled.
Preferably, the excitation light source is pulsed LED light source, is set between the pulsed LED light source and the sample devices
There is isochronous controller；
The method also includes:
The sample devices and the excitation light source are respectively connected to the isochronous controller, thus the synchronously control
Device is synchronous to trigger the sample devices and the excitation light source.
A kind of quick response pressure sensitive paint dynamic calibration apparatus of the present invention, the beneficial effect is that: structure is simple, at
This is low, and technical risk is small, and using fluidic oscillator as pulse signal generation device, incoming-flow pressure only needs 0.1~0.5MPa,
Size only has several centimetres, and measurement frequency is up to 20kHz, it is easy to accomplish and measurement；
Fluidic oscillator has the characteristics that jet flow is stable and periodic under the pressure of fixed incoming flow, and measurement accuracy is high, weight
Renaturation is good；
Sample devices and excitation light source cooperation, can acquire intensity information suffered by quick response pressure sensitive paint and pass through processor
It is converted into the phase and amplitude information of the frequency response of quick response pressure sensitive paint, and is converted into pressure information, the frequency response information of acquisition is more
Comprehensively.
Other features and advantages of the present invention will then part of the detailed description can be specified.
Detailed description of the invention
Exemplary embodiment of the invention is described in more detail in conjunction with the accompanying drawings, it is of the invention above-mentioned and its
Its purpose, feature and advantage will be apparent, wherein in exemplary embodiment of the invention, identical reference label
Typically represent same parts.
The structure that Fig. 1 shows the quick response pressure sensitive paint dynamic calibration apparatus of one exemplary embodiment of the present invention is shown
It is intended to；
Fig. 2 shows the structures of the quick response pressure sensitive paint dynamic calibration apparatus of another exemplary embodiment of the invention
Schematic diagram；
Fig. 3 shows fluidic oscillator in the quick response pressure sensitive paint dynamic calibration apparatus of exemplary embodiment of the present invention
Schematic structural cross-sectional view；
Fig. 4 shows the flow chart of the quick response pressure sensitive paint dynamic calibrating method of exemplary embodiment of the present invention；
The reference frequency that the quick response pressure sensitive paint dynamic calibrating method that Fig. 5 shows exemplary embodiment of the present invention obtains
Spectrogram；
The quick response pressure sensitive paint dynamic calibrating method that Fig. 6-Fig. 8 respectively illustrates exemplary embodiment of the present invention obtains
To the first print, the second print, third print acquisition spectrogram；
Description of symbols:
1 print to be measured, 2 gas sources, 3 sample devices, 4 excitation light sources, 5 fluidic oscillators, 6 pressure sensors, 7 filter plates, 8
Isochronous controller.
Specific embodiment
The preferred embodiment of the present invention is described in more detail below.Although the following describe preferred implementations of the invention
Mode, however, it is to be appreciated that may be realized in various forms the present invention without that should be limited by the embodiments set forth herein.Phase
Instead, these embodiments are provided so that the present invention is more thorough and complete, and can be by the scope of the present invention completely
It is communicated to those skilled in the art.
In order to solve the problems existing in the prior art, the present invention provides a kind of quick response pressure sensitive paint dynamic calibration apparatus,
Include:
Fluidic oscillator, for providing oscillating jet to the print to be measured for being coated with pressure sensitive paint；
Pressure sensor, in the action space of oscillating jet, for detecting the pressure of oscillating jet；
Light source is motivated, for irradiating sample surface to be measured；
Sample devices motivates at least portion of light source for acquiring the light intensity signal or voltage signal of sample surface to be measured
Divide irradiation area to be overlapped with the action space of the sampling area of sample devices and oscillating jet, motivates light source or sample devices court
To the outlet end of fluidic oscillator, and motivate the optical axis of light source perpendicular to the sample direction of sample devices；
The light intensity signal of processor, pressure and sample devices acquisition for being detected according to pressure sensor is rung to quick
Pressure sensitive paint is answered to carry out dynamic calibration.
Preferably, fluidic oscillator is miniature jet oscillator, belongs to existing product, incoming-flow pressure only needs 0.1~
0.5MPa, size is smaller, and shape size only has several centimetres, and measurement frequency is up to 20kHz.Miniature pulsing jet oscillation device
Basic principle is: when jet stream flows between two sidewalls, due to the small asymmetry and jet stream of component geometries itself
Existing disorder, jet stream will deflect, and the phenomenon finally firmly invested on the wall surface of side is referred to as jet stream wall attachment effect.
When jet stream is rapidly flowed by external fluid, original dynamic balance is broken, jet stream from invest one side wall become investing it is another
Side wall.Therefore this fluidic oscillation device switched using wall attachment effect and wall-attached jet can be used for detecting quick response pressure-sensitive
The dynamic response characteristic of paint.
It preferably, further include gas source, gas source is connected to by pressure reducing valve and pressure-bearing pipeline with fluidic oscillator, is come for providing
Stream, and guarantee that device is not affected by other factors, stablize incoming flow.
Preferably, gas source provides nitrogen, can choose the nitrogen cylinder of 5Mpa as gas source, to guarantee that gas source amount is sufficient and drops
The oxygen concentration of low environment.
Preferably, pressure sensor is existing product on the market, such as Kulite pressure sensor, according to pressure sensor
Own calibration formula and factory parameter, can be converted into pressure signal for the voltage signal that pressure sensor measures.
Preferably, according to the pressure of pressure sensor detection and the light intensity signal of sample devices acquisition to quick response pressure
Quick paint carries out dynamic calibration
The pressure signal with time series that pressure sensor detects is converted into reference spectrum figure；
When being converted into according to the light intensity signal with time series that Stern-Volmer equation acquires sample devices
M- pressure signal, and acquisition spectrogram is converted into according to pressure signal m- when this；
Comparison acquisition spectrogram and reference spectrum figure, to carry out dynamic calibration to quick response pressure sensitive paint.
Preferably, pressure sensor is set to the outlet end of fluidic oscillator.
Preferably, sample devices is high speed camera or photomultiplier tube, and high speed camera and photomultiplier tube are on the market
Usual products, wherein the signal of high speed camera acquisition is the picture signal with time series, i.e. light intensity signal, when having
Between the picture signal of sequence send the image processing system of processor to, be converted to grayscale image, i.e. light intensity distributions figure, pass through figure
As processing system extracts gray value from grayscale image, and equations turned by Stern-Volmer is pressure value, m- pressure when obtaining
Force curve；Photomultiplier tube is equations turned at having by Stern-Volmer by the voltage signal with time series of acquisition
The pressure value of time series, m- pressure curve when obtaining；By data processing software by when m- pressure curve be converted into frequency
With the curve of amplitude, i.e. spectrogram, to carry out spectrum analysis.
Preferably, filter plate is equipped in front of the signal acquisition terminal of sample devices, and the wavelength of filter plate is 640nm-
650nm, filter plate enter sample devices for tissue exciting light.
Preferably, filter plate is narrow band filter slice.
Preferably, excitation light source is pulsed LED light source, and the luminescence band of pulsed LED light source is 360nm-420nm, arteries and veins
It rushes and is equipped with isochronous controller between LED light source and sample devices.
Preferably, excitation light source is laser, and the luminescence band of laser is 360nm-532nm.
Preferably, the sample frequency of sample devices is consistent with the excitation luminous frequency of light source and is higher than consolidating for fluidic oscillator
There is basic frequency.
The present invention provides a kind of quick response pressure sensitive paint dynamic calibrating method, is marked using above-mentioned quick response pressure sensitive paint dynamic
Determine device, this method comprises:
Step 1, the outlet that print to be measured is placed in fluidic oscillator, the vibration that print to be measured and fluidic oscillator are provided
It is parallel to swing jet stream；
Sample devices is connect by step 2 with processor signal, the signal that sample devices is acquired be sent to processor into
Row processing；
Pressure sensor is fixed on print to be measured, and is located in the action space of oscillating jet by step 3, will
Pressure sensor is connect with processor signal；
Step 4, after adjusting the oscillating jet to stabilization of fluidic oscillator, oscillating jet with certain frequency periodic wobble,
Sample devices and pressure sensor acquire light intensity signal and voltage signal respectively and are transferred to processor and handled.
Preferably, excitation light source is pulsed LED light source, and isochronous controller is equipped between pulsed LED light source and sample devices；
This method further include:
Sample devices and excitation light source are respectively connected to isochronous controller, so that the synchronous triggering sampling of isochronous controller is set
Standby and excitation light source.
It preferably, the use of pulsed LED light source is when motivating light source, sample devices is high speed camera.
Preferably, using high speed camera be sample devices when, according to measurement demand be arranged high speed camera frequency acquisition f,
Time for exposure t, aperture size F and light source power P.
Preferably, in step 1, print to be measured first sprays the priming paint of quick response pressure sensitive paint before the use, to be dried
Quick response pressure sensitive paint finishing coat is sprayed after polishing, and darkroom is placed after drying and stands preservation；Test sample piece elder generation spray-applied primer is treated, with fast
The adhesive force of speed response pressure sensitive paint finishing coat, improves reflecting power.
Preferably, in step 4, bleed pressure is adjusted after gas source being connected to fluidic oscillator, and passes through pressure sensing
The measurement result of device determines the range of optimal bleed pressure, and optimal air pressure is adjusted out in the pressure limit, makes print to be measured
The stimulated radiation light intensity of the quick response pressure sensitive paint of upper spraying meets measurement demand and signal-to-noise ratio requirement.
Quick response pressure sensitive paint dynamic calibration is carried out according to quick response pressure sensitive paint dynamic calibration apparatus, sample devices will be adopted
One group of collection sends processor to the light intensity signal of time series, by image processing system or processing software, by light
Strength signal is by being converted into pressure value, or light intensity signal is converted into grayscale image and extracts gray value, and passes through Stern-
Volmer equations turned is pressure value, and calculation formula is as follows:
In formula, P is quick response pressure sensitive paint pressure, i.e. acquisition pressure；
PrefFor reference pressure, a usually atmospheric pressure；
I is the collected light intensity signal of calibration process；
IrefFor reference light intensity, the usually light intensity under an atmospheric pressure；
A (T) and B (T) is the typical coefficient of quick response pressure sensitive paint, and A (T) and B (T) are according to the quiet of quick response pressure sensitive paint
State calibration index, i.e. quick response pressure sensitive paint calibration curve determine.
It is m- when obtaining such as Matlab software by processing software after obtaining pressure value according to the light intensity signal of acquisition
Pressure curve, i.e. acquisition time-pressure curve, and by processing software carry out data analysis after, by acquisition time-pressure curve
It is converted into the curve of frequency and amplitude, i.e. acquisition spectrogram, i.e. the frequency response information of quick response pressure sensitive paint；
The ginseng that the reference voltage value with time series for the oscillating jet that pressure sensor measures is converted by processor
It examines the reference time-pressure curve formed after pressure value and is converted into reference spectrum figure, that is, refer to frequency response information, and frequency spectrum will be acquired
Figure is compared with reference spectrum figure, can be demarcated to the dynamic response characteristic of quick response pressure sensitive paint.
When acquisition spectrogram is consistent with the variation tendency of reference spectrum figure, illustrate the dynamic of this kind of quick response pressure sensitive paint
Response characteristic is good, meets the requirements；When the variation tendency for acquiring spectrogram and reference spectrum figure is variant, illustrate this kind quickly
The dynamic response characteristic for responding pressure sensitive paint is poor, undesirable.
Embodiment 1
As shown in figures 1 and 3, the present invention provides a kind of quick response pressure sensitive paint dynamic calibration apparatus, comprising:
Fluidic oscillator 5, for providing oscillating jet to the print to be measured 1 for being coated with pressure sensitive paint；
Pressure sensor 6, in the action space of oscillating jet, for detecting the pressure of oscillating jet；
Light source 4 is motivated, for irradiating 1 surface of print to be measured；
Sample devices 3 motivates at least partly irradiated region of light source 4 for acquiring the light intensity signal on 1 surface of print to be measured
Domain is overlapped with the action space of the sampling area of sample devices 3 and oscillating jet, and sample devices 3 is towards fluidic oscillator 5
Outlet end, and motivate the optical axis of light source 4 perpendicular to the sample direction of sample devices 3；
Processor, the light intensity signal that pressure and sample devices 3 for being detected according to pressure sensor 6 acquire is to quick
It responds pressure sensitive paint and carries out dynamic calibration.
In the present embodiment, fluidic oscillator 5 is miniature jet oscillator, belongs to existing product, incoming-flow pressure only needs 0.1
~0.5MPa, size is smaller, and shape size only has several centimetres, and measurement frequency is up to 20kHz.
It in the present embodiment, further include gas source 2, gas source 2 is connected to by pressure reducing valve and pressure-bearing pipeline with fluidic oscillator 5.
In the present embodiment, gas source 2 provides nitrogen, can choose the nitrogen cylinder of 5Mpa as gas source 2, to guarantee gas source 2
Amount is sufficient and reduces the oxygen concentration of environment.
In the present embodiment, pressure sensor 6 is existing product on the market, is Kulite pressure sensor.
In the present embodiment, the light intensity signal that the pressure and sample devices 3 detected according to pressure sensor 6 acquires is to fast
Speed response pressure sensitive paint carries out dynamic calibration and includes:
The pressure signal with time series that pressure sensor 6 is detected is converted into reference spectrum figure；
When being converted into according to the light intensity signal with time series that Stern-Volmer equation acquires sample devices 3
M- pressure signal, and acquisition spectrogram is converted into according to pressure signal m- when this；
Comparison acquisition spectrogram and reference spectrum figure, to carry out dynamic calibration to quick response pressure sensitive paint.
In the present embodiment, pressure sensor 6 is set to the outlet end of fluidic oscillator 5.
In the present embodiment, sample devices 3 is high speed camera, and the signal of high speed camera acquisition is the figure with time series
As signal, the picture signal with time series sends the image processing system of processor to, is converted to grayscale image, i.e. luminous intensity
Distribution map extracts gray value by image processing system from grayscale image, and equations turned by Stern-Volmer is pressure
Value, m- pressure curve when obtaining, by data processing software by when m- pressure curve be converted into the curve of frequency and amplitude, i.e.,
Spectrogram, to carry out spectrum analysis.
In the present embodiment, it is equipped with filter plate 7 in front of the signal acquisition terminal of sample devices 3, and the wavelength of filter plate 7 is
640nm-650nm, filter plate 7 enter sample devices 3 for tissue exciting light.
In the present embodiment, filter plate 7 is narrow band filter slice 7.
In the present embodiment, excitation light source 4 is pulsed LED light source, and the luminescence band of pulsed LED light source is 360nm-
420nm is equipped with isochronous controller 8 between pulsed LED light source and sample devices 3.
In the present embodiment, the sample frequency of sample devices 3 is consistent with the excitation luminous frequency of light source 4 and is higher than jet stream vibration
Swing the intrinsic basic frequency of device 5.
In the present embodiment, the use of high speed camera is sample devices 3, the acquisition frequency of high speed camera is set according to measurement demand
Rate f, time for exposure t, aperture size F and light source power P.
The present invention provides a kind of quick response pressure sensitive paint dynamic calibrating method, is marked using above-mentioned quick response pressure sensitive paint dynamic
Determine device, this method comprises:
Preparation process, print to be measured 1 first spray the priming paint of quick response pressure sensitive paint before the use, spray after polishing to be dried
Quick response pressure sensitive paint finishing coat is applied, darkroom is placed after drying and stands preservation；1 wire spraying priming paint of test sample piece is treated, with quick response
The adhesive force of pressure sensitive paint finishing coat improves reflecting power.
Step 1, the outlet that print 1 to be measured is placed in fluidic oscillator 5 provide print 1 to be measured with fluidic oscillator 5
Oscillating jet it is parallel；
Sample devices 3 is connect by step 2 with processor signal, and the signal that sample devices 3 acquires is sent to processor
It is handled；
Pressure sensor 6 is fixed on print 1 to be measured, and is located in the action space of oscillating jet by step 3,
Pressure sensor 6 is connect with processor signal；
Step 4 adjusts 2 pressure of gas source, and passes through the measurement of pressure sensor 6 after being connected to gas source 2 with fluidic oscillator 5
As a result the range for determining optimal 2 pressure of gas source, adjusts out optimal air pressure in the pressure limit, makes to spray on print 1 to be measured
The stimulated radiation light intensity of quick response pressure sensitive paint meet measurement demand and signal-to-noise ratio requirement；
After the oscillating jet to stabilization for adjusting fluidic oscillator 5, oscillating jet is set with certain frequency periodic wobble, sampling
Light intensity signal and voltage signal are acquired respectively and is transferred to processor and is handled for 3 and pressure sensor 6.
This method further include:
Sample devices 3 and excitation light source 4 are respectively connected to isochronous controller 8, so that the synchronous triggering of isochronous controller 8 is adopted
Sample equipment 3 and excitation light source 4.
In the present embodiment, quick response pressure sensitive paint dynamic is carried out according to quick response pressure sensitive paint dynamic calibration apparatus to mark
Fixed, sample devices 3 sends the light intensity signal with time series of acquisition, i.e. picture signal to processor, passes through processing
Picture signal is converted into grayscale image by software, and extracts gray value, by calculating grayvalue transition at pressure value, to obtain
When m- pressure curve, by data processing software by when m- pressure curve be converted into the curve of frequency and amplitude, i.e. acquisition frequency
Spectrogram, and the frequency response information of i.e. quick response pressure sensitive paint；
The ginseng that the reference voltage value with time series for the oscillating jet that pressure sensor 6 measures is converted by processor
It examines the reference time-pressure curve formed after pressure value and is converted into reference spectrum figure, that is, refer to frequency response information, and frequency spectrum will be acquired
Figure is compared with reference spectrum figure, can be demarcated to the dynamic response characteristic of quick response pressure sensitive paint.
Using above-mentioned quick response pressure sensitive paint dynamic calibration apparatus, demarcated according to above-mentioned scaling method, test result
As shown in Fig. 5 to Fig. 8.Wherein, Fig. 5 shows the reference spectrum figure obtained by the pressure signal that pressure sensor 6 detects, figure
6 to Fig. 8 respectively illustrate the acquisition spectrogram of the first print, the second print, third print.In Fig. 5 into Fig. 8, abscissa is
Frequency, ordinate are amplitude.
According to Fig. 5 as can be seen that the dominant frequency of reference spectrum figure is 5371Hz, corresponding frequency multiplication is respectively 10742Hz,
16113Hz and 21484Hz.Comparison diagram 5 and Fig. 6 is it is found that the measurement result and reference spectrum figure of the first print are almost the same, master
Frequency is 5371Hz, and corresponding frequency multiplication is respectively 10742Hz, 16113Hz and 21484Hz, and highest frequency response is 21484HHz.And it is right
Than Fig. 6-8 it is found that the first print is highest one of signal-to-noise ratio in all prints.According to Fig. 7 as can be seen that the master of the second print
Frequency is 5371Hz, and the second frequency-doubled signal is suitable with noise intensity, cannot function as its response characteristic frequency, therefore, it is determined that the second print
Coating response frequency be 6kHz magnitude.According to Fig. 8 as can be seen that the measurement result of third print more connects with reference spectrum figure
Closely, dominant frequency 5371Hz, while second and the third feature frequency information of 10742Hz and 16113Hz are collected, therefore it is most
High frequency sound is 16113Hz, but noise is poor.
Embodiment 2
As shown in Fig. 2, according to the quick response pressure sensitive paint dynamic calibration apparatus of embodiment 2 the difference from embodiment 1 is that,
In the present embodiment, sample devices 3 is photomultiplier tube, and photomultiplier tube is existing product, for what will be acquired
Light intensity signal is converted into electric signal and passes to processor progress spectrum analysis.
In the present embodiment, excitation light source 4 is laser, and the luminescence band of laser is 360nm-532nm.
In the present embodiment, quick response pressure sensitive paint dynamic is carried out according to quick response pressure sensitive paint dynamic calibration apparatus to mark
Fixed, the light intensity signal with time series of acquisition, the i.e. voltage signal of photomultiplier tube are conveyed to place by sample devices 3
Device is managed, voltage signal is converted by pressure value by processing software, thus m- pressure curve when obtaining, and pass through processing software
By when m- pressure curve be converted into the curve of frequency and amplitude, i.e. acquisition spectrogram, and the frequency response of i.e. quick response pressure sensitive paint is believed
Breath；
The ginseng that the reference voltage value with time series for the oscillating jet that pressure sensor 6 measures is converted by processor
It examines the reference time pressure curve formed after pressure value and is converted into reference spectrum figure, that is, refer to frequency response information, and frequency spectrum will be acquired
Figure is compared with reference spectrum figure, can be demarcated to the dynamic response characteristic of quick response pressure sensitive paint.
Various embodiments of the present invention are described above, above description is exemplary, and non-exclusive, and
It is not limited to disclosed each embodiment.Without departing from the scope and spirit of illustrated each embodiment, for this skill
Many modifications and changes are obvious for the those of ordinary skill in art field.
Claims (10)
1. a kind of quick response pressure sensitive paint dynamic calibration apparatus characterized by comprising
Fluidic oscillator (5), for providing oscillating jet to the print to be measured (1) for being coated with pressure sensitive paint；
Pressure sensor (6), in the action space of the oscillating jet, for detecting the pressure of the oscillating jet；
It motivates light source (4), for irradiating print to be measured (1) surface；
Sample devices (3), for acquiring the light intensity signal on print to be measured (1) surface, the excitation light source (4) is at least
Partial illumination region is overlapped with the action space of the sampling area of the sample devices (3) and the oscillating jet, described to swash
Encourage the outlet end of light source (4) or the sample devices (3) towards the fluidic oscillator (5), and the light of excitation light source (4)
Sample direction of the axis perpendicular to the sample devices；
The luminous intensity of processor, pressure and the sample devices (3) acquisition for being detected according to the pressure sensor (6) is believed
Number to the quick response pressure sensitive paint carry out dynamic calibration.
2. quick response pressure sensitive paint dynamic calibration apparatus according to claim 1, which is characterized in that passed according to the pressure
The pressure of sensor (6) detection and the light intensity signal of the sample devices (3) acquisition move the quick response pressure sensitive paint
State is demarcated
The pressure signal with time series that the pressure sensor (6) are detected is converted into reference spectrum figure；
The light intensity signal with time series that the sample devices (3) acquires is converted into according to Stern-Volmer equation
When m- pressure signal, and according to it is described when m- pressure signal be converted into acquisition spectrogram；
The acquisition spectrogram and the reference spectrum figure are compared, to carry out dynamic calibration to the quick response pressure sensitive paint.
3. quick response pressure sensitive paint dynamic calibration apparatus according to claim 1, which is characterized in that the pressure sensor
(6) it is set to the outlet end of the fluidic oscillator.
4. quick response pressure sensitive paint dynamic calibration apparatus according to claim 1, which is characterized in that the sample devices
It (3) is high speed camera or photomultiplier tube.
5. quick response pressure sensitive paint dynamic calibration apparatus according to claim 4, which is characterized in that the sample devices
(3) filter plate (7) are equipped in front of signal acquisition terminal, and the wavelength of the filter plate (7) is 640nm-650nm.
6. quick response pressure sensitive paint dynamic calibration apparatus according to claim 5, which is characterized in that the excitation light source
It (4) is pulsed LED light source, and the luminescence band of the pulsed LED light source is 360nm-420nm, the pulsed LED light source and institute
It states and is equipped with isochronous controller (8) between sample devices (3).
7. quick response pressure sensitive paint dynamic calibration apparatus according to claim 6, which is characterized in that the excitation light source
It (4) is laser, the luminescence band of the laser is 360nm-532nm.
8. quick response pressure sensitive paint dynamic calibration apparatus according to claim 7, which is characterized in that the sample devices
(3) sample frequency is consistent with the excitation luminous frequency of light source (4) and is higher than the intrinsic dominant frequency of the fluidic oscillator (5)
Rate.
9. a kind of quick response pressure sensitive paint dynamic calibrating method utilizes quick sound according to any one of claim 1 to 8
Answer pressure sensitive paint dynamic calibration apparatus, which is characterized in that the described method includes:
Step 1, the outlet that the print (1) to be measured is placed in the fluidic oscillator (5), make the print to be measured (1) with
The oscillating jet that the fluidic oscillator (5) provides is parallel；
The sample devices (3) is connect by step 2 with the processor signal；
The pressure sensor (6) is fixed on the print to be measured (1), and is located at the oscillating jet by step 3
In action space, the pressure sensor (6) is connect with the processor signal；
Step 4, after adjusting the oscillating jet to stabilization of the fluidic oscillator (5), oscillating jet is periodically put with certain frequency
Dynamic, the sample devices (3) and the pressure sensor (6) acquire light intensity signal and voltage signal respectively and are transferred to described
Processor is handled.
10. quick response pressure sensitive paint dynamic calibrating method according to claim 9, which is characterized in that the excitation light source
(4) it is pulsed LED light source, is equipped with isochronous controller (8) between the pulsed LED light source and the sample devices (3)；
The method also includes:
The sample devices (3) and the excitation light source (4) are respectively connected to the isochronous controller (8), thus described same
Walk controller (8) described sample devices (3) of synchronous triggering and the excitation light source (4).
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| CN110849539A (en) * | 2019-11-27 | 2020-02-28 | 中国航空工业集团公司北京长城计量测试技术研究所 | Calibration device for pressure measurement system with tube cavity |
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| CN113945353A (en) * | 2020-07-17 | 2022-01-18 | 军事科学院系统工程研究院网络信息研究所 | Aerodynamic test method based on luminescent material |
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| CN112304491A (en) * | 2020-10-29 | 2021-02-02 | 西北工业大学 | Pressure-sensitive paint pressure calibrating device based on CCD camera long exposure light source stroboscopic |
| CN112304492A (en) * | 2020-10-29 | 2021-02-02 | 西北工业大学 | Pressure-sensitive paint pressure calibration method based on CCD camera long exposure light source stroboscopic |
| CN112304492B (en) * | 2020-10-29 | 2022-03-25 | 西北工业大学 | Pressure-sensitive paint pressure calibration method based on CCD camera long exposure light source stroboscopic |
| CN112304491B (en) * | 2020-10-29 | 2022-03-25 | 西北工业大学 | Pressure-sensitive paint pressure calibrating device based on CCD camera long exposure light source stroboscopic |
| CN116942082A (en) * | 2023-06-27 | 2023-10-27 | 浙江大学 | Calibration method and device for flexible film pressure sensor |
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