CN204788256U - Remote benchmark laser displacement sensor - Google Patents
Remote benchmark laser displacement sensor Download PDFInfo
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- CN204788256U CN204788256U CN201520384847.4U CN201520384847U CN204788256U CN 204788256 U CN204788256 U CN 204788256U CN 201520384847 U CN201520384847 U CN 201520384847U CN 204788256 U CN204788256 U CN 204788256U
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- laser
- laser displacement
- array device
- displacement sensor
- displacement transducer
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- Length Measuring Devices By Optical Means (AREA)
Abstract
The utility model discloses a remote benchmark laser displacement sensor, including a laser emitter spare and laser displacement sensor, laser displacement sensor includes photoelectricity array device, the laser entry window has been seted up on the photoelectricity array device, laser emitter's transmitting terminal with photoelectricity array device's laser entry window is relative, photoelectricity array device is provided with the dark chamber of an optics in the one end of laser entry window, laser displacement sensor and treater electric connection, the treater includes a AD signal conversion treater. The utility model discloses equipment structure is novel, and is applicable to the detection of long -range distance, detects the precision and up to 1 -2um, is applicable to different detections through adding cylindrical lens, and the detection range is extensive. The interpolation of optical filtering subassembly is suitable for the illumination luminance under the different environment.
Description
Technical field
The utility model relates to a kind of sensor, particularly relates to a kind of remote reference laser displacement transducer and distance-finding method thereof.
Background technology
Laser displacement sensor can the change such as position, displacement of accurate non-cpntact measurement testee, is mainly used in the measurement of the geometric senses such as the displacement of inspected object, thickness, vibration, distance, diameter.According to measuring principle, laser displacement sensor principle is divided into laser triangulation and return laser beam analytic approach.And the principle that existing laser sensor principle is all scioptics or reflection calculates and measure displacement, meanwhile, sensor internal relative complex.
Existing generating laser and measuring unit are generally arranged in a housing, laser is irradiated to testee back reflection, the laser of reflection, by optical lens system imaging on the photoelectric array devices such as CCD or CMOS, then draws the distance between sensor and testee by image processing and analyzing.But this sensor maximum range is no more than 3.0m; Can only distance between survey sensor and measured point, the displacement on other direction then must be mounted on correspondence direction; And optical lens system is complicated and manufacturing accuracy requires high, involve great expense.
In construction work, general mechanical dial gauge, appearance grid or the grating displacement sensor of adopting detects, but the position (0.1 ~ 0.3m) that these benchmark must be nearer in measured point.When the displacement measurement of remote benchmark (reference point and measured point distant) generally adopts the form of datum line beam (frame) pilot measurement.Utilize joist steel, channel-section steel etc. to have the long pole of certain rigidity of structure as datum line beam (frame), 2 or multiple spot are fixed on benchmark far away, provide a stable benchmark by the position that such mode is nearer in measured point.Then be fixed on datum line beam (frame) by using the mode such as Magnetic gauge stand or unit clamp by displacement transducer, chaining pin then withstands on testee and measures.Erection joist steel, channel-section steel etc. seem heavy and time-consuming in testing, can not embody the portable and quick of test completely.
Utility model content
In view of the defect that above-mentioned prior art exists, the purpose of this utility model proposes a kind of remote reference laser displacement transducer and distance-finding method thereof.
The purpose of this utility model, will be achieved by the following technical programs:
A kind of remote reference laser displacement transducer, comprise a laser transmitter device and laser displacement sensor, described laser displacement sensor comprises photoelectric array device, described photoelectric array device offers laser entrance window, the transmitting terminal of described generating laser is relative with the laser entrance window of described photoelectric array device, described photoelectric array device is provided with an Optical Dark Solitary Pulse chamber in one end of laser entrance window, described laser displacement sensor and processor are electrically connected, and described processor comprises an A/D signal switching processor.
Preferably, one end of the laser entrance window of described photoelectric array device is provided with a filtering assembly, and described filtering assembly and photoelectric array device form Optical Dark Solitary Pulse chamber.
Preferably, described filtering assembly front end is provided with optical slot sheet.
Preferably, described filtering assembly is filter coating or optical filter.
Preferably, described filtering assembly and photoelectric array device are bonding connection.
Preferably, the transmitting terminal of described laser transmitter device is connected with a cylindrical lens.
Preferably, the optical maser wavelength of described laser transmitter device is 500nm-550nm.
Preferably, described photoelectric array device is line array CCD.
Preferably, described filtering assembly is sun filter coating.
Preferably, comprise the steps,
S1, laser transmitter device and laser displacement sensor are placed on reference thing and testee respectively;
The laser that S2, laser transmitter device send, irradiates on the photoelectric array device in laser displacement sensor through filtering assembly;
The level signal exporting respective pixel point is transferred to signal processor and carries out the conversion process of signal and the storage of level signal magnitude of voltage by S3, photoelectric array device;
S4, by formula V
c=U
av-(U
av-U
min) × k fixes limit the reference voltage level of pixel, wherein, and V
cfor the reference voltage level of boundary pixel; U
avfor the average voltage of all pixels; U
minfor the minimum value in all pixel voltage; K is boundary selectivity constant;
S5, according to formula S=n
c× l calculates distance, and wherein, S is the distance that laser irradiates between boundary pixel and the first pixel, and nc is the serial number of boundary pixel, and l is photoelectric array device sensitivity speck spacing; Described laser irradiation boundary pixel is first and is less than boundary pixel reference voltage level V
ccorresponding pixel.
The utility model gives prominence to effect: device structure is novel, and is applicable to the detection of long-range distance, and accuracy of detection is up to 1-2um, and be applicable to different detections by adding cylindrical lens, sensing range is extensive.The interpolation of filtering assembly is suitable for the illumination brightness under varying environment.
Below just accompanying drawing in conjunction with the embodiments, is described in further detail embodiment of the present utility model, is easier to understand, grasp to make technical solutions of the utility model.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is another test structure schematic diagram of the present utility model, has now installed cylindrical mirror additional at laser displacement sensor transmitting terminal.
Fig. 3 is that the utility model is applicable to test three dimensions distance structure schematic diagram.
Embodiment
As shown in Figure 1, the utility model discloses a kind of remote reference laser displacement transducer, comprise a laser transmitter device and laser displacement sensor, described laser displacement sensor comprises photoelectric array device, described photoelectric array device offers laser entrance window, the transmitting terminal of described generating laser is relative with the laser entrance window of described photoelectric array device, described photoelectric array device is provided with filtering assembly in one end of laser entrance window, described laser displacement sensor and processor are electrically connected, and described processor comprises an A/D signal switching processor.Described photoelectric array device is line array CCD.
One end of the laser entrance window of described photoelectric array device is provided with a filtering assembly, and described filtering assembly and photoelectric array device form Optical Dark Solitary Pulse chamber.The existence in Optical Dark Solitary Pulse chamber not only can make photoelectric array device normally work, and can also extend the serviceable life of photoelectric array device.
Described filtering assembly is filter coating or optical filter, and described filtering assembly and photoelectric array device are bonding connection.Because optical filter or filter coating not only have the effect of isolated most of extraneous veiling glare, the emittance of most of collimated laser beam can also be intercepted, avoid photosensitive unit in photoelectric array device or sensitivity speck by the laser burnout of high density energy.Optical filter or filter coating not only all band can intercept veiling glare, can also, by different plated films, allow the light of specific wavelength enter photoelectric array device, thus improve signal to noise ratio (S/N ratio).In order to reach best filter effect, described filtering assembly is sun filter coating.Its principle is that most of extraneous veiling glare is all filtered, optical filter or define an Optical Dark Solitary Pulse chamber between filter coating and line array CCD due to when using optical filter or filter coating, and the signal of line array CCD exports normal.When not using optical filter or filter coating, all pixels of line array CCD are state of saturation, cannot normally work.
Normally can work under outdoor strong sunlight to adapt to this displacement transducer, the optical maser wavelength of described laser transmitter device is 500nm-550nm.Such as optical filter or filter coating use and can intercept infrared ray, red spectrum and ultraviolet, the plated film of blue color spectrum or material, only allow the green light of 500nm-550nm wavelength penetrate, and select the laser instrument of 500nm-550nm wavelength to launch collimated laser beam simultaneously.
Installation optical slot sheet is optionally carried out in described filtering assembly front end.Optical slot sheet is installed and can completely cuts off most of veiling glare equally, but the optical path direction incident veiling glare vertical with slit sheet can not intercepted completely.Although slit sheet is for intercepting the effect of extraneous veiling glare not as using the satisfactory for result of optical filter or filter coating, it can select to allow the light of specific light path pass through.This set direction, can by the lower result of use of cost improvement laser displacement sensor under outdoor situations as a kind of supplementary means.In addition, when comparatively multisensor works together, when especially multiple collimated laser beam interferes with each other, install optical slot sheet additional and just can select the collimated laser beam of incidence, eliminate mutual interference.
In order to expand the scope of test, as shown in Figure 2, the transmitting terminal of described laser transmitter device 3 is connected with a cylindrical lens 11, generating laser is sent and can launch fan-shaped collimated laser beam 12, like this when needing to test the displacement between multiple object, use same laser transmitter device 3.
Shown in composition graphs 3, if laser transmitter device 3 launches a branch of collimation cross laser bundle 13, only need two laser displacement sensors 5 to intersect 90 ° of installations, then can measure the displacement of two axis; If increase a laser displacement sensor 5 in its side again or increase distance measurement function on laser transmitter device 3, then can measure the three dimensions displacement of testee.
Comprise the steps,
S1, laser transmitter device 3 and laser displacement sensor 5 are placed on reference thing 1 and testee 2 respectively;
A branch of collimated laser beam 4 that S2, laser transmitter device 3 send, through optical filter or filter coating 7, irradiates on sharp photoelectric array device 6; Meanwhile, signal processor 8 calculates according to the different photosensitive unit of brightness on photoelectric array device 6 or sensitivity speck the position that collimated laser beam 4 irradiates;
The level signal exporting respective pixel point is transferred to signal processor and carries out the conversion process of signal and the storage of level signal magnitude of voltage by S3, photoelectric array device;
S4, by formula V
c=U
av-(U
av-U
min) × k fixes limit the reference voltage level of pixel, wherein, and V
cfor the reference voltage level of boundary pixel; U
avfor the average voltage of all pixels; U
minfor the minimum value in all pixel voltage; K is boundary selectivity constant.
S5, according to formula S=n
c× l calculates distance, and wherein, S is the distance that laser irradiates between boundary pixel and the first pixel, n
cfor the serial number of boundary pixel, l is the distance between the pixel of laser irradiation boundary; Laser irradiation boundary pixel is first and is less than boundary pixel reference voltage level V
ccorresponding pixel.
Circular is illustrated as further: establish the brighter photosensitive unit being collimated laser beam 4 irradiation to be the n-th photosensitive unit, n is multiplied by the distance S between distance l i.e. illuminated sensitivity speck between neighboring photosites and the 1st sensitivity speck, signal processor 8 is according to the cycle outputting measurement value S of setting, and shown by display screen 9, or send to the miscellaneous equipment such as computing machine or PLC 10 simultaneously.
If reference thing 1 maintains static, then laser transmitter device 3 and collimated laser beam 4 also can not offset.Now testee 2 produces relative displacement on tested direction, then laser displacement sensor 5 also can produce corresponding displacement on tested direction, and corresponding skew also occurs in the position that collimated laser beam 4 is radiated on photoelectric array device 6 simultaneously.The difference S1-S2 of its twice measured value of calculating like this, just can obtain reference thing 1 and the shift value of testee 2 on tested direction.The measured value recorded during zero setting also by the mode of inner zero setting, can be set to zero by this sensor, then after, the measured value of output or display is exactly directly relative to displacement during zero setting.
Due to pixel wider range that laser irradiating part divides, so need selected suitable method to carry out computational analysis, thus accurate laser is found to irradiate boundary and the pixel corresponding to boundary (hereinafter referred to as boundary pixel).
First determine the reference voltage level (Vc) for judging boundary pixel, then compare the magnitude of voltage of each pixel and Vc respectively, finally fix limit pixel.The pixel that fixes limit has following several method:
1, minimum value method: in the level signal that all effective pixel points export, the pixel that voltage is minimum, is namely irradiated with a laser the strongest pixel as boundary pixel:
Vc=U
minin=Min (Ui) formula
Vc is the reference voltage level judging boundary pixel;
U
minfor the minimum value in all pixel voltage;
Ui is the magnitude of voltage of i-th pixel;
I is the number of effective pixel points.
2, minimum △ value method: from the 2nd effective pixel points, in the level signal of i-th pixel and the i-th-1 pixel, the pixel that voltage difference is minimum, pixel corresponding to the steepest place that namely output level pulse signal envelope declines is as boundary pixel:
△ V
c=Min (U
i-U
i-1) in formula
△ V
cfor the voltage difference of boundary pixel pixel previous with it;
U
iit is the magnitude of voltage of i-th pixel;
U
i-1it is the magnitude of voltage of the i-th-1 pixel;
I is the number of effective pixel points.
3, dynamic thresholding method: first average voltage (U being less than all pixel level signals
av) and minimum value (U
min) between the suitable pixel corresponding to value as boundary pixel, its expression formula is:
Vc＝U
av-(U
av-U
min)×k
V in formula
cfor judging the reference voltage level of boundary pixel;
U
avfor the average voltage of all pixels;
U
minfor the minimum value in all pixel voltage;
K is boundary selectivity constant;
Its concrete value affects by the factor such as signal to noise ratio (S/N ratio) of line array CCD performance, measuring-signal, and the method for general available contrast experiment is determined.
The major parameter of optical filter or filter coating is the transmittance under collimated laser beam wavelength and the transmittance under other spectral range.By the impact of the factor such as light sensitivity and measuring speed of the power of practical service environment, collimated laser beam, distance between measuring point and reference point, photoelectric array device, specifically select the optical filter of which kind of parameter or filter coating can be determined by contrast test.
Proof of algorithm:
Adopt line array CCD as photoelectric array device in experiment, signal processor exports the clock signal needed for line array CCD work, according to the clock signal of signal processor, line array CCD exports the level signal of respective pixel point one by one, signal processor carries out A/D conversion to level signal, and is stored by the level signal magnitude of voltage (Ui) of each pixel and carry out calculating and comparative analysis.The light intensity that the magnitude of voltage of level signal and its corresponding pixel points are irradiated to is inversely proportional to.
Line array CCD used totally 7500 effective pixel points in this experiment, pel spacing 9.325 μm, theoretical useful range 69.9375mm.
Each testing site gathers 50 Calculation results and carries out cross validation as sample.
Sensor distance generating laser about 10m in experimentation and install firm, avoids other error effect experimental result.
In dynamic thresholding, constant k is 0.8.
The utility model still has numerous embodiments, all employing equivalents or equivalent transformation and all technical schemes formed, and all drops within protection domain of the present utility model.
Claims (9)
1. a remote reference laser displacement transducer, comprise a laser transmitter device and laser displacement sensor, it is characterized in that: described laser displacement sensor comprises photoelectric array device, described photoelectric array device offers laser entrance window, the transmitting terminal of described generating laser is relative with the laser entrance window of described photoelectric array device, described photoelectric array device is provided with an Optical Dark Solitary Pulse chamber in one end of laser entrance window, described laser displacement sensor and processor are electrically connected, and described processor comprises an A/D signal switching processor.
2. the remote reference laser displacement transducer of one according to claim 1, it is characterized in that: one end of the laser entrance window of described photoelectric array device is provided with a filtering assembly, described filtering assembly and photoelectric array device form Optical Dark Solitary Pulse chamber.
3. the remote reference laser displacement transducer of one according to claim 2, is characterized in that: described filtering assembly front end is provided with optical slot sheet.
4. the remote reference laser displacement transducer of one according to claim 2, is characterized in that: described filtering assembly is filter coating or optical filter.
5. the remote reference laser displacement transducer of one according to claim 4, is characterized in that: described filtering assembly and photoelectric array device are bonding connection.
6. the remote reference laser displacement transducer of one according to claim 1, is characterized in that: the transmitting terminal of described laser transmitter device is connected with a cylindrical lens.
7. the remote reference laser displacement transducer of one according to claim 1, is characterized in that: the optical maser wavelength of described laser transmitter device is 500nm-550nm.
8. the remote reference laser displacement transducer of one according to claim 1, is characterized in that: described photoelectric array device is line array CCD.
9. the remote reference laser displacement transducer of one according to claim 4, is characterized in that: described filtering assembly is sun filter coating.
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| CN201520384847.4U CN204788256U (en) | 2015-06-05 | 2015-06-05 | Remote benchmark laser displacement sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880155A (en) * | 2015-06-05 | 2015-09-02 | 苏州市建设工程质量检测中心有限公司 | Long-distance reference laser displacement sensor and distance measurement method thereof |
| CN107816940A (en) * | 2016-09-14 | 2018-03-20 | 西安航通测控技术有限责任公司 | A kind of gamut photoelectric sensor for Laser Light Plane Scanning cyberspace alignment system |
-
2015
- 2015-06-05 CN CN201520384847.4U patent/CN204788256U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880155A (en) * | 2015-06-05 | 2015-09-02 | 苏州市建设工程质量检测中心有限公司 | Long-distance reference laser displacement sensor and distance measurement method thereof |
| CN107816940A (en) * | 2016-09-14 | 2018-03-20 | 西安航通测控技术有限责任公司 | A kind of gamut photoelectric sensor for Laser Light Plane Scanning cyberspace alignment system |
| CN107816940B (en) * | 2016-09-14 | 2020-01-21 | 西安航通测控技术有限责任公司 | Full-range photoelectric sensor for laser plane scanning network space positioning system |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151118 Termination date: 20200605 |
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| CF01 | Termination of patent right due to non-payment of annual fee |