CN87107180A - Displacement detecting - Google Patents

Abstract

Be used for determining the device of ohject displacement, it comprises that an edge leads to the light path of a detecting device (7) and propagate the light source (1) that polychromatic light is used.Be furnished with for example radiation modulation apparatus of optical filter (5) on the predetermined fixed position with respect to light source (1), the displacement of responsive objects and adjust light path is so that change the distribution spectral content of the light that arrives detecting device (7).Detecting device comprises first and second light response elements (10,11) that have different responsivenesses for wavelength, and a microprocessor (14) receives the signal from light response element.Microprocessor is calculated as two or more parametric representations on chromaticity (CIE) figure, the color of the incident ray on the detecting device (7), and utilize the color of the incident ray on the displacement explained detector 7 of object.

Description

The present invention relates to the displacement detecting of object.Such as the position, speed, acceleration, the parameter of pressure and temperature and so on can both be transformed into a displacement, and determines it by detecting this displacement.

In the known displacement measurement system, a kind of component that light beam is divided into its wavelength as the spectral splitting device of prism or grating.The displacement of spectral splitting device is to measure by detecting the wavelength that receives on a certain given check point.

The present invention provides an innovative approach for this class displacement measurement system.

Therefore, the device that is used for definite ohject displacement that is provided comprises: a light source of using along the light path propagation polychromatic light that leads to a detecting device; Be in radiation modulation apparatus with respect to the predetermined fixed position of this detecting device; Be used to adjust the device of heterogeneous light light path, the displacement that this optical length adjustment device should be able to responsive objects with the distribution spectral content that changes the light that arrives detecting device; And analytical equipment; This detecting device comprises first and second light response elements at least, first element is to be different from second element for the responsiveness of wavelength for the responsiveness of wavelength, signal from all light response elements is fed to analytical equipment, analytical equipment is according to the color that goes out from the calculated signals of light response element as the light of the arrival detecting device of two or more parametric representations chromaticity (CIE) figure on, and analytical equipment is suitable for utilizing the color of light of the displacement explanation arrival detecting device of object.

At least need two light response elements, and first element is different from the responsiveness of second element for wavelength for the responsiveness of wavelength.In a kind of convenient means, two different light response elements of the wavelength response degree characteristic that has itself have separately been adopted.Another kind method is, one or two of light response element comprises a colour light filter sheet that transmits the colour response characteristic, thereby allows when needing and adopt two identical light response elements.First and second light response elements preferably make their wavelength/light intensity curves separately and the wave spectrum overlaid of at least a portion for the responsiveness of wavelength.

Therefore, with only detecting selected one or more the variation of wavelength (wavelength-modulated) different, colored variation is definite by the overall variation of evaluate spectra (color modulation) selected portion.Like this, represent by wavelength/light intensity curve A from colored A() represent by wavelength/light intensity curve B to colored B() variation just can calculate according to the area these two curves, thereby provide the perfect analysis of relevant " very " look.The limitation of wavelength-modulated is that it is just according to a kind of calculating with the distance between two curves of one or more selected wavelength.

Noun ' polychromatic light ' in this article refers to any multi-wavelength's radiation, is meant particularly both to have contained visible light, contains ultrared radiation again.And be the used noun ' color ' of convenient understanding herein, never be meant only to adopt visible light.Under the situation of the radiation outside device adopts visible spectrum, the spectral distribution of this radiation just represented in noun ' color '.

Preferably disposing one is suitable for polychromatic light is focused on concentrating element on the radiation modulation apparatus.Optical length adjustment device is convenient to comprise the displacement of responsive objects and device that mobile concentrating element is used.The mobile ratio that has changed by the light beam of radiation modulation apparatus of concentrating element, thus the color that arrives the light beam of detecting device changed.

Change a method in addition, dispose a reflecting surface, make its be positioned to can reflect focalization the polychromatic light on radiation modulation apparatus, optical length adjustment device comprise in order to one of in mobile concentrating element and the reflecting surface or two all move so that the device of distance between change concentrating element and the reflecting surface.The variation of distance can change the ratio by the light beam of radiation modulation apparatus again between concentrating element and the reflecting surface.But reflecting surface preferably responsive objects displacement and move with respect to concentrating element.If possible, by its displacement object cremasteric reflex face undetermined, generally the form with the reflection diaphragm in the pressure transducer occurs.

In a kind of suitable layout, radiation modulation apparatus is integrally formed in the concentrating element.Concentrating element shape spherical in shape easily perhaps is cylindrical, and the most handy transparent glass is made.

Radiation modulation apparatus preferably includes an optical filter of the light intensity of decay quilt propagation wavelength in varying degrees.This optical filter suitably comprises the elongated member that its color absorption characteristic varies along its length.In a kind of suitable layout, optical filter comprises an elongated member with a coloured moiety and a transparent part, and the transformation between wherein said coloured moiety and the transparent part comes across a well-defined edge.This edge suitably obliquely extends with respect to the longitudinal axis of elongated member.Under the situation in radiation modulation apparatus is integrally formed in concentrating element, radiation modulation apparatus suitably comprises a coloured core, and its shape is the shape that sphere or cylindrical shape then depend on concentrating element.

The present invention also belongs to a kind of and adopts device as described herein and the method for a definite ohject displacement.Especially a kind of method of detection one ohject displacement, this method comprises following step: propagate polychromatic light along the light path that leads to a detecting device; Radiation modulation apparatus is bearing on the predetermined fixed position with respect to detecting device; The displacement of responsive objects and adjust heterogeneous light light path is so that change the distribution spectral content of the light that arrives detecting device; Detect the light that arrives detecting device with at least the first and second light response elements, first element is different for the responsiveness of wavelength with second element for the responsiveness of wavelength; Go out color according to the calculated signals of light response element as the light of the arrival detecting device of two or more parametric representations on chromaticity (CIE) figure; And the color of the light that arrives detecting device is explained in the displacement that utilizes object.

Fig. 1 is according to schematic representation of apparatus of the present invention;

Fig. 2 to Fig. 4 is the synoptic diagram according to other embodiment of device of the present invention;

Fig. 5 is the synoptic diagram of modulator element embodiment that is used for the device of Fig. 1 to Fig. 3; And

Fig. 6 is a practicable embodiment cut-open view according to device of the present invention.

See figures.1.and.2, displacement sensing apparatus comprises light source 1, and what adjoin with light source 1 is the optical fiber 2 that light is transferred to the gap 3 that disposes hyaloplasmic sphere 4 and dispersive modulator 5 in it from light source 1.Light by gap 3 is transferred to a detecting device that briefly is shown in 7 places by another optical fiber 6.

Spheroid 4 is dressed up to make and can respond displacement to be measured, along as shown in Figure 1 vertically, or as shown in Figure 2 horizontal of edge and moving.Dispersive modulator 5 comprises a filter element, and this filter element contains a colourless part 8 and a coloured moiety 9, and tangible boundary is arranged between the two.Detecting device 7 comprises two light response elements 10 and 11, and they are different for the responsiveness of wavelength.Signal from element 10 and 11 is fed to microprocessor 14 respectively through circuit 12 and 13.The output signal of this microprocessor is sent to display 15 through circuit 16, excites this display.

When spheroid 4 because the result of displacement and when mobile, it is changed for the focussing force of the light that penetrates from optical fiber 2, thereby make the light of different proportion pass the coloured moiety 9 of dispersive modulator 5.This color that causes the light that arrives detecting device 7 changes.The light that shines on the light response element 10 and 11 produces two different output signals, and these signals are analyzed by little processing 14.Microprocessor 14 calculates the color with the light of two parametric representations on chromaticity (CIE) figure according to the signal from light response element 10 and 11.These parameters and the parameter on the look-up table that is stored in the ROM (read-only memory) of microprocessor are made comparisons, and obtain the respective value of displacement.Utilize display 15 to show displacement then, display 15 usually is a light-emitting diode display.

A kind of pattern of Fig. 3 indication device, wherein the light that penetrates from optical fiber 2 passes spheroid 4, and the diaphragm 17 that is reflected reflects.Reflection ray returns before passing dispersive modulator 5 and arriving as previously described detecting device 7 and passes spheroid 4.In this device, not that spheroid 4 but diaphragm 17 move in response to displacement to be measured, the vertically moving as shown in Figure 3 of diaphragm.This makes and returns the light path that passes spheroid and change, thereby has changed the ratio of the light of the coloured moiety 9 that passes dispersive modulator 5.The color of the light of arrival detecting device provides the reading of diaphragm displacement through analyzing as the aforementioned.

A kind of pattern of Fig. 4 presentation graphs 3 devices, wherein spheroid and dispersive modulator are merged into single parts.Spheroid 4 comprises a transparent outside 18 and a coloured core 19.As mentioned before, the mobile light that changed of diaphragm 17 passes the light path of spheroid, thereby has changed the ratio that light passes coloured core 19.This has just produced change in color on the detecting device 7 of needs indication diaphragm displacement.

Fig. 5 represents another kind of dispersive modulator 20, and dispersive modulator 20 can be in order to the dispersive modulator 5 in the displacement detector that replaces Fig. 1 to Fig. 3.Dispersive modulator 20 comprises a colourless part 8 and a coloured moiety 9 as previously described, but demarcates with the oblique angle between two parts of modulator 20.This modulator is compared with modulator 5, and the comparatively mild change color along its length is provided.

Fig. 6 represents for example to be usually used in a kind of micro sensing head in the industrial sensor. Optical fiber 2 and 6 is placed in the shell 26, and is connected with 22 with thicker optical fiber 21, and optical fiber 21 and 22 wraps in briefly in the resin foreskins with 23 expressions.Dispersive modulator 5 is the shape of glass filter, and spheroid 4 disposes by supporting device 24,25.Contain diaphragm 17 with the shell 26 removable covers 27 that are connected of turning up the soil.This layout is suitable for as pressure transducer.

Claims (12)

1, be used for determining the device of an ohject displacement, it has the light path that a detecting device (7) is led on an edge to propagate the light source (1) that polychromatic light is used; This device is characterised in that it comprises: be in respect to the radiation modulation apparatus on the predetermined fixed position of this detecting device (7) (5; 19; 20); In order to adjusting heterogeneous light light path, so that change the device of the distribution spectral content of the light that arrives detecting device (7), this optical length adjustment device is in response to the displacement of this object, and analytical equipment (14); This detecting device comprises first and second light response elements (10 at least, 11), this first element (10) is inequality for the responsiveness of wavelength with this second element (11) for the responsiveness of wavelength, from described light response element (10,11) signal is fed to this analytical equipment (14), this analytical equipment (14) basis is from described light response element (10,11) described calculated signals goes out the color that incides the radiation on this detecting device (7) as two or more parametric representations on chromaticity (IE) figure, and this analytical equipment (14) is suitable for utilizing the displacement of this object to explain the color of this radiation that arrives this detecting device (7).

2, according to the device of claim 1, it is characterized in that: it is furnished with one and is suitable for polychromatic light is focused on this radiation modulation apparatus (5; 19; 20) concentrating element on (4).

3, according to the device of claim 2, it is characterized in that: this optical length adjustment device comprises the displacement that responds this object and moves the device of this concentrating element (4) usefulness.

4, according to the device of claim 2, it is characterized in that: a reflecting surface (17) that is provided is positioned to and will be reflected in this radiation modulation apparatus (5 through the polychromatic light that focuses on; 19; 20) on, this optical length adjustment device comprises in order to move in this concentrating element (4) and this reflecting surface (17) one or two and all moving, so that change the device of distance between the two.

5, according to the device of claim 4, it is characterized in that: this reflecting surface (17) can respond the displacement of this object and move with respect to this concentrating element (4).

6, according to the device of claim 5, it is characterized in that: this reflecting surface (17) is to be provided by its displacement this object undetermined.

7, according to the device of claim 4 to 6, it is characterized in that: this radiation modulation apparatus (19) is integrally formed in this concentrating element (14).

8, according to any one device in the claim 1 to 7, it is characterized in that: this radiation modulation apparatus (5; 20) comprise some optical filters that are transmitted the light intensity of wavelength of decaying in varying degrees.

9, device according to Claim 8 is characterized in that: this optical filter (5; 20) comprise the elongated member that its color absorption characteristic changes along its length.

10, according to the device of claim 9, it is characterized in that: this optical filter (5; 20) comprise that one has a coloured moiety (9) and a transparent part (8), and the transformation between the described coloured and transparent part betides the elongated member of a well-defined edge.

11, according to the device of claim 10, it is characterized in that: this well-defined edge obliquely extends with respect to the longitudinal axis of this elongated member (20).

12, a kind of method of propagating heterogeneous light detection one ohject displacement along the light path that leads to a detecting device (7) that comprises is characterized in that following all steps: with radiation modulation apparatus (5; 19; 20) be bearing on the predetermined fixed position with respect to this detecting device (7); Adjust the light path that polychromatic light responds this ohject displacement, so that change the distribution spectral content of the light that arrives this detecting device (7); Detect the light that arrives this detecting device (7) with at least the first and second light response elements (10,11), this first element (10) is inequality with the responsiveness of this second element (11) for the responsiveness of wavelength; According to signal, calculate the color that incides the radiation on the detecting device (7) as two or more parametric representations on this chromaticity (CIE) figure from this light response element (10,11); And the displacement solution that utilizes this object is released into the color that is mapped to the radiation on this detecting device (7).

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