CN108645341A - Fluorescence type displacement sensing method - Google Patents
Fluorescence type displacement sensing method Download PDFInfo
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- CN108645341A CN108645341A CN201810196358.4A CN201810196358A CN108645341A CN 108645341 A CN108645341 A CN 108645341A CN 201810196358 A CN201810196358 A CN 201810196358A CN 108645341 A CN108645341 A CN 108645341A
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- fluorescent material
- fluorescent
- fluorescence
- sensing method
- displacement sensing
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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
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention relates to a kind of fluorescence type displacement sensing methods.The proportioning of the ingredient or composite fluorescent material that control fluorescent material changes along coordinate direction regularity, so that the emission spectrum regularity variation for the fluorescent material being distributed along coordinate direction, the fluorescent material for correspondingly showing as different location has different fluorescent characteristics, such as fluorescence chromaticity coordinates, peak strength ratio etc., correspond to specific position to the special value of fluorescent characteristics.This method can measure position, the direction of displacement, displacement size, have many advantages, such as electromagnetism interference, wireless measurement, easy to operate, reliable and stable.
Description
Technical field
The present invention relates to the methods of optical measurement displacement, and in particular to the position based on spectrofluorimetry principle and displacement
Measurement method.
Background technology
Common low resolution optical displacement sensor is photoimpact formula displacement sensor.It will be by that will carry equidistant black and white
The tablet of striped reflective tape is fixed on measured object, and when measured object is subjected to displacement, reflection light is sensed by light-sensitive element and converted
For a series of electric impulse signal, electric impulse signal number is directly proportional to displacement.This technology needs the electric arteries and veins of real-time continuous acquisition
The relative displacement of object can be measured by rushing signal, cannot directly measure the position of object；The density of the reflective black and white strip of printing
Determine that the resolving power of its displacement measurement is not high.
The more accurate optical displacement sensor part such as grating scale uses Moire fringe counting technology, and by counting fringe number
Amount makees opposite displacement measurement, cannot directly measure the position of object.
The present invention proposes that a kind of fluorescence type displacement sensing method, different fluorescence profile datas correspond to different location, because
Sensor need not be resetted the absolute position that can directly measure object by this, and understand the opposite variation of position in turn, that is,
The size of displacement and direction；The resolving power of displacement measurement depends primarily on the granularity of fluorescent material and the hot spot ruler of exciting light
It is very little, can reach so that more than grating scale resolving power.
Invention content
It is an object of the invention to propose that a kind of fluorescence type displacement sensing method, this method have the advantages of optical measurement method such as
Immune electromagnetic interference, can wireless transmission signal, intrinsic safety, while compared with existing optical displacement sensor, in functionality
It is upper to supplement without resetting ability, the judgement to direction of displacement that directly measure initial position；In performance indicator side
Face can improve resolving power level.
Technical scheme is as follows：A kind of fluorescence type displacement sensing method controls the ingredient or compound of fluorescent material
The proportioning of fluorescent material changes along coordinate direction regularity so that along the emission spectrum rule of the fluorescent material of coordinate direction distribution
Property variation, the fluorescent material for correspondingly showing as different location has different fluorescent characteristics numerical value, such as fluorescence chromaticity coordinates, peak value
Intensity ratio, fluorescence intensity, fluorescent band peak wavelength or centre wavelength position etc. correspond to the special value of fluorescent characteristics
Specific position.
After the composition transfer or proportioning of the fluorescent material change, its emission spectrum also generates distinguishable variation,
Such as spectral peak frequency displacement, intensity distribution change etc..
The ingredient of fluorescent material changes along coordinate direction regularity or composite fluorescent material is by fluorescent material A and fluorescence
Material B compositions, the accountings of fluorescent material A in the composite monotonously change along coordinate direction.
The coordinate consecutive variations are the track for constituting change in location, are established in rectangular coordinate system, natural system of coordinates, pole
Among coordinate system or other space coordinates.
The fluorescent characteristics is position sensor signal, and the different numerical value of fluorescent characteristics correspond to the glimmering of different coordinate positions
Luminescent material.
The fluorescent characteristics includes but not limited to fluorescence chromaticity coordinates, Insulin ratio, fluorescence intensity, fluorescent band
Peak wavelength or centre wavelength position.
The regularity variation can also be derived to fluorescence excitation spectrum, transmitted spectrum, reflectance spectrum, scattering spectrum
Analysis.
The coordinate of the different location is to calculate displacement and judge the foundation of direction of displacement, be based on measured position with
The variation of time can also obtain speed, acceleration information.
The essence of the present invention is the colorimetry principle for the mixed proportion that different wavelengths of light is depended on using fluorescence color, with not
Same iridescent corresponds to different positions.
Beneficial effects of the present invention：Displacement sensing method based on spectrofluorimetry has can determine position without resetting
It sets, can determine whether the high advantage of direction of displacement, spatial resolution, such as immune electromagnetism of Common advantages for being provided simultaneously with optical measurement method is dry
Disturb, can wireless transmission signal, intrinsic safety.
Description of the drawings
Fig. 1 is the spectrum example of the fluorescent material of the present invention.
Fig. 2 is the mix proportion scheme example of the composite fluorescent material of the present invention.
Fig. 3 is chromaticity coordinates ~ position relationship example corresponding to the composite fluorescent material mix proportion scheme example of the present invention.
Specific implementation mode
The technology of the present invention content part describes a kind of side of measurement position and displacement based on spectrofluorimetry principle
Method.By taking common grating spectrograph is constituted spectrophotometry experimental system as an example, it is as follows to specifically describe this method：
Suitable fluorescent material is chosen first, can be the controllable fluorescent material of ingredient or the composite fluorescent material that proportioning can be changed.
For example, fluorescent material A and fluorescent material B is respectively provided with typical emission spectra A shown in FIG. 1 and emission spectrum B, it is glimmering with both
Luminescent material mixing composition composite fluorescent material, then their emission spectrum superposition.Fluorescent material A and fluorescence in composite fluorescent material
Material B component ratio is different, and the intensity distribution of the emission spectrum after superposition just correspondingly changes.
The component ratio for controlling fluorescent material A and fluorescent material B changes along coordinate direction regularity, for example, such as Fig. 2 institutes
Show, take the one-dimensional directions x of rectangular coordinate system, the component ratio of fluorescent material A and fluorescent material B have specific distribution in the x-direction, i.e.,
The accountings of fluorescent material A in the composite are in the x-direction linearly by zero to 100% variation, and correspondingly fluorescent material B is compound
Accounting in material linearly changes to zero by 100% in the x-direction.The actual needs of apparent displacement detection can also use pole to sit
The other coordinate systems of any types such as mark, natural coordinates.
The composite fluorescent material of the fluorescence for inspiring composite fluorescent material, the then different location being distributed in the x-direction is different
Fluorescent characteristics numerical value.For example, as shown in figure 3, with this fluorescent characteristics of the chromaticity coordinates of mixed light of composite fluorescent material transmitting
As position sensor signal, then specific iridescent is corresponding to specific position.The chromaticity coordinates of Fig. 3 only gives CIE1931 colorations
The y-coordinate of figure, is the standard by CIE1931, and the emission spectrum of the composite fluorescent material based on different location calculates separately to obtain.
In turn, the fluorescence spectrum for measuring composite luminescent material on the arbitrary unknown position in sensing scope, calculates chromaticity coordinates, by color
Coordinate substitutes into position ~ chromaticity coordinates sensing equation of Fig. 3 to get to x coordinate position.
The difference for directly calculating whole story x coordinate position is the displacement measured in the x-direction.The positive and negative reflection displacement of difference is edge
The negative direction of the directions x or x-axis.
The fluorescent characteristics that can be used as position sensor signal can also be fluorescence intensity, fluorescence intensity ratio, fluorescent band peak value
Wavelength or centre wavelength position etc..For example, with the peak strength ratio in Fig. 1R = IA/IBAs fluorescent characteristics amount, it is reflected
The component ratio of composite fluorescent material, specificallyRNumerical value corresponds to specific position.
With change in location, the regularity variation similar with this programme of other spectrum can be used for displacement sensing, can use
Spectrum include fluorescence excitation spectrum, transmitted spectrum, reflectance spectrum, scattering spectrum.
Analysis position, which changes with time, may further obtain speed, acceleration information.
The present invention is not limited to the above embodiments.
Claims (8)
1. a kind of fluorescence type displacement sensing method, it is characterised in that：Control the ingredient of fluorescent material or matching for composite fluorescent material
Than changing along coordinate direction regularity so that along the emission spectrum regularity variation of the fluorescent material of coordinate direction distribution, accordingly
The fluorescent material that ground shows as different location has different fluorescent characteristics, corresponds to certain bits to the special value of fluorescent characteristics
It sets.
2. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The fluorescent material has
Such property：After its composition transfer or proportioning change, its emission spectrum also generates distinguishable variation.
3. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The ingredient of fluorescent material is along seat
The variation of mark direction regularity or composite fluorescent material are made of fluorescent material A and fluorescent material B, and fluorescent material A is in composite wood
Accounting in material changes along coordinate direction.
4. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The coordinate consecutive variations
Constitute the track of change in location, establish rectangular coordinate system, natural system of coordinates, polar coordinate system or other space coordinates it
In.
5. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The fluorescent characteristics is position
Transducing signal is set, the different numerical value of fluorescent characteristics correspond to the fluorescent material of different coordinate positions.
6. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The fluorescent characteristics includes
Fluorescence chromaticity coordinates, Insulin ratio, fluorescence intensity, fluorescent band peak wavelength or centre wavelength position.
7. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The regularity variation
The analysis to fluorescence excitation spectrum, transmitted spectrum, reflectance spectrum, scattering spectrum can be derived from.
8. a kind of fluorescence type displacement sensing method according to claim 1, it is characterised in that：The seat of the different location
Mark is to calculate displacement and judge the foundation of direction of displacement, changed with time based on measured position can also obtain speed,
Acceleration information.
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| CN201810196358.4A CN108645341B (en) | 2018-03-09 | 2018-03-09 | Fluorescent displacement sensing method |
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Cited By (2)
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| CN110274554A (en) * | 2019-07-26 | 2019-09-24 | 南昌航空大学 | A kind of fluorescence type angular transducer |
| CN114812402A (en) * | 2022-05-20 | 2022-07-29 | 南昌航空大学 | Optical method for coaxial displacement detection |
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| CN114812402A (en) * | 2022-05-20 | 2022-07-29 | 南昌航空大学 | Optical method for coaxial displacement detection |
| CN114812402B (en) * | 2022-05-20 | 2023-12-26 | 南昌航空大学 | Optical method for coaxial displacement detection |
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