CN201748900U - Self-adaptive displacement measuring device for ambient light - Google Patents
Self-adaptive displacement measuring device for ambient light Download PDFInfo
- Publication number
- CN201748900U CN201748900U CN2010202524850U CN201020252485U CN201748900U CN 201748900 U CN201748900 U CN 201748900U CN 2010202524850 U CN2010202524850 U CN 2010202524850U CN 201020252485 U CN201020252485 U CN 201020252485U CN 201748900 U CN201748900 U CN 201748900U
- Authority
- CN
- China
- Prior art keywords
- light
- comparer
- adjusting module
- light receiving
- receiving element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Abstract
The utility model relates to the technical field of precision detection, in particular to a self-adaptive displacement measuring device for ambient light, which aims to improve the detection precision and comprises a light emitting device, an optical lens group, a light receiving device and a data processing unit, wherein the data processing unit is internally provided with an exposure time adjusting module and a light intensity adjusting module; the exposure time adjusting module is used for detecting the average intensity of the ambient light in the spot image; and the light intensity adjusting module is used for detecting the light intensity peak value of the spot image. During measurement, firstly the light emitting device emits a light beam on the surface of the object to be measured, so that a spot is generated on the surface of the object to be measured, the reflected light rays of the spot are focused through the optical lens group and then received by the light receiving device and sent to the exposure time adjusting module and the light intensity adjusting module for analysis, and finally the exposure time of the light receiving device and the emission beam intensity of the light emitting device are self-adaptively adjusted according to the analysis result. The device has high detection precision.
Description
Technical field
The utility model relates to the accurate technology that detects, and particularly relates to a kind of technology of ambient light adaptive displacement measuring device.
Background technology
Based on the displacement measurement method of laser triangulation because its noncontact, applied widely, obtain application more and more widely, the ultimate principle of common displacement measurement method based on laser triangulation is, light source (LED for example, laser etc.) scioptics send one and detect light beam, shine the testee surface and form hot spot, the corresponding position imaging on the light receiving element device of this hot spot by single lens or a reception mirror group, ohject displacement is corresponding with the position of laser image spot on light receiving element, by the position of identification laser image spot on light receiving element, can obtain the displacement of testee.
In the existing displacement measurement method based on laser triangulation, often adopt PSD as the laser image spot setting element, because PSD can't regulate the time shutter, need weaken the signal noise that surround lighting produces from light path itself by adding methods such as optical filter, the intensity of adjusting emission light beam and the method for launch time are often adopted in the adjusting of signal.Also having a kind of method at present is to adopt CCD/CMOS as the laser image spot setting element, and this method can produce a large amount of noises under the excessive situation of ambient light interference, bring bigger displacement error, so its accuracy of detection is also lower.
The utility model content
At the defective that exists in the above-mentioned prior art, technical problem to be solved in the utility model provides the high ambient light adaptive displacement measuring device of a kind of accuracy of detection.
In order to solve the problems of the technologies described above, a kind of ambient light adaptive displacement measuring device provided by the utility model comprises light emitting devices, optical frames group, light receiving element and data processing unit; Described light emitting devices is used for making the testee surface produce hot spot to testee surface emitting light beam, described optical frames group is used to receive the reflection ray and the focal imaging of testee surface hot spot, described optical receiver is used to receive the imaging of optical frames group, and imaging is converted to sampled data, described data processing unit is electrically connected light receiving element and light emitting devices, it is characterized in that: be provided with exposure time adjusting module and light intensity adjusting module in the described data processing unit;
Described exposure time adjusting module comprises three comparers, a counter, a totalizer, a divider and a logic gate chip; Described three comparers are respectively first comparer, second comparer and the 3rd comparer;
Described light intensity adjusting module comprises the 4th comparer and latch;
Described light receiving element connects and output data to the first comparer, the 4th comparer and latch;
Described first comparer connect respectively and output data to counter, totalizer, described counter connects also output data to the second comparer, divider, described totalizer connection and output data are to divider, described divider connects and output data to the three comparers, described second, third comparer connection and output data are to the logic gate chip, and described logic gate chip connects and control the time shutter of light receiving element;
Described the 4th comparer connection and output data are to latch, and the output of described latch divides two-way, and one the tunnel connects and output data to the four comparers, and another road connects and control the emission beam intensity of light emitting devices.
Further, also comprise a pulse signal generator, described pulse signal generator connection and control light receiving element, light emitting devices synchronous operation.
Further, described light receiving element is CCD.
The ambient light adaptive displacement measuring device that the utility model provides, detect the mean intensity of the ambient light in light spot images that light receiving element receives by exposure time adjusting module, detect the light intensity peak of the laser image spot that light receiving element receives by light intensity adjusting module, and adjust the time shutter of light receiving element and the emission beam intensity of light emitting devices according to the testing result of exposure time adjusting module and light intensity adjusting module, therefore can regulate time shutter and emission beam intensity according to the variation self-adaptation of surround lighting, reduce the influence of surround lighting, its accuracy of detection is higher.
Description of drawings
Fig. 1 is the light path and the structural representation of the ambient light adaptive displacement measuring device of the utility model embodiment;
Fig. 2 is the exposure time adjusting module in the ambient light adaptive displacement measuring device of the utility model embodiment and the structural representation of light intensity adjusting module;
Fig. 3 is the working timing figure of the ambient light adaptive displacement measuring device of the utility model embodiment.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model is described in further detail, but present embodiment is not limited to the utility model, every employing analog structure of the present utility model and similar variation thereof all should be listed protection domain of the present utility model in.
As shown in Figure 1, a kind of ambient light adaptive displacement measuring device that the utility model embodiment is provided comprises light emitting devices 10, optical frames group 13, light receiving element 14 and data processing unit 15; Described light emitting devices 10 is used for making testee 12 surfaces produce hot spot to testee 12 surface emitting light beams, described optical frames group 13 is used to receive the reflection ray and the focal imaging of testee 12 surperficial hot spots, described optical receiver 14 is used to receive the imaging of optical frames group 13, and imaging is converted to sampled data, described data processing unit 15 is electrically connected light receiving element 14 and light emitting devices 10, it is characterized in that: be provided with exposure time adjusting module and light intensity adjusting module in the described data processing unit 15;
As shown in Figure 2, described exposure time adjusting module comprises three comparers, a counter J, totalizer A, a divider D and a logic gate chip L; Described three comparers are respectively the first comparer B1, the second comparer B2 and the 3rd comparer B3;
Described light intensity adjusting module comprises the 4th comparer B4 and latch S;
Described light receiving element 14 connects and output data to the first comparer B1, the 4th comparer B4 and latch S;
The described first comparer B1 connect respectively and output data to counter J, totalizer A, described counter J connects and output data to the second comparer B2, divider D, described totalizer J connection and output data are to divider D, described divider D connects and output data to the three comparer B3, the described second comparer B2, the 3rd comparer B3 connection and output data are to logic gate chip L, and described logic gate chip L connects and control the time shutter of light receiving element 14;
Described the 4th comparer B4 connection and output data are to latch S, and the output of described latch S divides two-way, and one the tunnel connects and output data to the four comparer B4, and another road connects and control the emission beam intensity of light emitting devices 10;
Also comprise a pulse signal generator M among the utility model embodiment, described pulse signal generator M connection and control light receiving element 14, light emitting devices 10 synchronous operations; As shown in Figure 3, when pulse signal generator M sends a control wave, light emitting devices 10 emission measurement light beams, simultaneously light receiving element 14 receives the laser image spot of reflection ray of being made of the testee surface of picture optical frames, behind the end of run, light receiving element is to the sampled data of exposure time adjusting module and light intensity adjusting module output facula picture.
Among the utility model embodiment, described light receiving element is CCD.
The displacement measurement method of the ambient light adaptive displacement measuring device that the utility model embodiment is provided is characterized in that, concrete steps are as follows:
Ambient light signal threshold value in A, setting first comparer, amount of ambient light threshold value in second comparer, surround lighting in the 3rd comparer is crossed weak threshold value and surround lighting is crossed strong threshold value, and the beam intensity in the light emitting devices is crossed weak threshold value and beam intensity is crossed strong threshold value;
B, elder generation make the testee surface produce hot spot by light emitting devices to testee surface emitting one light beams, and the reflection ray of testee surface hot spot is received by light receiving element after the optical frames group is focused to laser image spot;
C, light receiving element are delivered to exposure time adjusting module and light intensity adjusting module analysis respectively with laser image spot;
Among the described step C, the concrete steps that exposure time adjusting module is analyzed laser image spot are as follows:
1) with counter and totalizer zero clearing;
2) light receiving element is converted to serial data with a frame laser image spot and sends first comparer to;
3) first comparer compares received data and ambient light signal threshold value one by one, relatively finishes until the data of this frame laser image spot;
Wherein, when first comparer detects data value and is lower than the ambient light signal threshold value, be about to this data value and regard as ambient light signal, be about to these data send in the totalizer with totalizer in data add up, make the amount of ambient light in the counter add 1 simultaneously;
4) counter is delivered to second comparer and divider with count results, and totalizer is delivered to divider with accumulation result;
5) divider is divided by data in the totalizer and the amount of ambient light in the counter, obtains delivering to the 3rd comparer after the mean intensity of surround lighting;
6) second comparer compares amount of ambient light and amount of ambient light threshold value, and comparative result is delivered to the logic gate chip;
Wherein, when amount of ambient light is lower than the amount of ambient light threshold value, regard as amount of ambient light very little, this moment, the output of second comparer 0, otherwise it is more then to regard as amount of ambient light, and this moment, the output of second comparer 1;
7) the 3rd comparer with the mean intensity and the surround lighting of surround lighting cross weak threshold value, surround lighting is crossed strong threshold value and is compared respectively, and comparative result is delivered to the logic gate chip respectively;
Wherein, the mean intensity of surround lighting and surround lighting cross weak threshold ratio than the time, cross weak threshold value if the average intensity value of surround lighting is lower than surround lighting, it is too short then to regard as the time shutter, this moment, the output of the 3rd comparer 0, otherwise then exported 1;
Wherein, the mean intensity of surround lighting and surround lighting cross strong threshold ratio than the time, if the average intensity value of surround lighting is higher than surround lighting and crosses strong threshold value, it is long then to regard as the time shutter, this moment, the output of the 3rd comparer 0, otherwise then exported 1;
8) the logic gate chip carries out logical operation to the comparative result of second comparer and two comparative results of the 3rd comparer, and adjusts the time shutter of light receiving element according to operation result;
Wherein, when the comparative result of second comparer is an amount of ambient light very little the time, the logic gate chip prolongs the time shutter of light receiving element;
Wherein, when the comparative result of the 3rd comparer is that amount of ambient light is more, and the comparative result of the 3rd comparer is time shutter when too short, and the logic gate chip prolongs the time shutter of light receiving element;
Wherein, when the comparative result of the 3rd comparer is that amount of ambient light is more, and the comparative result of the 3rd comparer is time shutter when long, and the logic gate chip shortens the time shutter of light receiving element;
Among the described step C, the concrete steps that light intensity adjusting module is analyzed laser image spot are as follows:
1) with the latch zero clearing;
2) light receiving element is converted to serial data with a frame laser image spot and sends the 4th comparer and latch to;
3) the 4th comparer compares the data of received laser image spot and the output data of latch one by one, find out the serial data peak value of this frame laser image spot after the data of this frame laser image spot relatively finish, the serial data peak value of finding out is sent to light emitting devices by latch;
Wherein, when the data value that detects input when the 4th comparer is higher than the output data value of latch, promptly to latch signal of latch output, latch is saved in output terminal with the data value of importing after receiving latch signal, and the data value that its output terminal is exported is updated to the data value of current input;
4) the serial data peak value of light emitting devices laser image spot that latch is sent here is crossed weak threshold value and beam intensity with the beam intensity of setting and is crossed strong threshold value and compare;
Wherein, when the serial data peak value of laser image spot was lower than beam intensity and crosses weak threshold value, then the strength signal to current light beam increased adjusting;
Wherein, when the serial data peak value of laser image spot was higher than beam intensity and crosses strong threshold value, then the strength signal to current light beam reduced to regulate.
Claims (3)
1. an ambient light adaptive displacement measuring device comprises light emitting devices, optical frames group, light receiving element and data processing unit; Described light emitting devices is used for making the testee surface produce hot spot to testee surface emitting light beam, described optical frames group is used to receive the reflection ray and the focal imaging of testee surface hot spot, described optical receiver is used to receive the imaging of optical frames group, and imaging is converted to sampled data, described data processing unit is electrically connected light receiving element and light emitting devices, it is characterized in that: be provided with exposure time adjusting module and light intensity adjusting module in the described data processing unit;
Described exposure time adjusting module comprises three comparers, a counter, a totalizer, a divider and a logic gate chip; Described three comparers are respectively first comparer, second comparer and the 3rd comparer;
Described light intensity adjusting module comprises the 4th comparer and latch;
Described light receiving element connects and output data to the first comparer, the 4th comparer and latch;
Described first comparer connect respectively and output data to counter, totalizer, described counter connects also output data to the second comparer, divider, described totalizer connection and output data are to divider, described divider connects and output data to the three comparers, described second, third comparer connection and output data are to the logic gate chip, and described logic gate chip connects and control the time shutter of light receiving element;
Described the 4th comparer connection and output data are to latch, and the output of described latch divides two-way, and one the tunnel connects and output data to the four comparers, and another road connects and control the emission beam intensity of light emitting devices.
2. device according to claim 1 is characterized in that: also comprise a pulse signal generator, described pulse signal generator connection and control light receiving element, light emitting devices synchronous operation.
3. device according to claim 1 is characterized in that: described light receiving element is CCD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202524850U CN201748900U (en) | 2010-07-08 | 2010-07-08 | Self-adaptive displacement measuring device for ambient light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202524850U CN201748900U (en) | 2010-07-08 | 2010-07-08 | Self-adaptive displacement measuring device for ambient light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201748900U true CN201748900U (en) | 2011-02-16 |
Family
ID=43583575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202524850U Expired - Lifetime CN201748900U (en) | 2010-07-08 | 2010-07-08 | Self-adaptive displacement measuring device for ambient light |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201748900U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922918A (en) * | 2010-07-08 | 2010-12-22 | 上海雷尼威尔测量技术有限公司 | Ambient light adaptive displacement measuring device and measuring method thereof |
| CN104769388A (en) * | 2012-11-14 | 2015-07-08 | 高通股份有限公司 | Dynamic adjustment of light source power in structured light active depth sensing systems |
-
2010
- 2010-07-08 CN CN2010202524850U patent/CN201748900U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922918A (en) * | 2010-07-08 | 2010-12-22 | 上海雷尼威尔测量技术有限公司 | Ambient light adaptive displacement measuring device and measuring method thereof |
| CN101922918B (en) * | 2010-07-08 | 2012-09-05 | 上海雷尼威尔测量技术有限公司 | Ambient light adaptive displacement measuring device and measuring method thereof |
| CN104769388A (en) * | 2012-11-14 | 2015-07-08 | 高通股份有限公司 | Dynamic adjustment of light source power in structured light active depth sensing systems |
| CN104769388B (en) * | 2012-11-14 | 2018-11-27 | 高通股份有限公司 | The dynamic of light source power is adjusted in structure light active depth sense system |
| US10368053B2 (en) | 2012-11-14 | 2019-07-30 | Qualcomm Incorporated | Structured light active depth sensing systems combining multiple images to compensate for differences in reflectivity and/or absorption |
| US11509880B2 (en) | 2012-11-14 | 2022-11-22 | Qualcomm Incorporated | Dynamic adjustment of light source power in structured light active depth sensing systems |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10775507B2 (en) | Adaptive transmission power control for a LIDAR | |
| CN109085599B (en) | Distance measuring device with SPAD array and distance walk compensation | |
| CN107272020B (en) | High-sensitivity polarization laser radar system based on Gm-APD | |
| US9417326B2 (en) | Pulsed light optical rangefinder | |
| CN101922918B (en) | Ambient light adaptive displacement measuring device and measuring method thereof | |
| CN103308921B (en) | A kind of device and method measuring object distance | |
| CN106019300A (en) | Laser ranging device and laser ranging method thereof | |
| CN104793215A (en) | Laser radar device and object detecting method | |
| CN205992055U (en) | A kind of laser ranging system | |
| CN108828616B (en) | Photon counting laser radar capable of realizing monopulse ranging and constant false alarm control method | |
| CN108427109A (en) | Determine the equipment and corresponding method at a distance from object | |
| WO2017221909A1 (en) | Distance measuring device | |
| WO2021189794A1 (en) | Time of flight ranging system and ranging method therefor | |
| CN108303690A (en) | A kind of distance measuring method and range-measurement system for eliminating laser radar blind area | |
| CN103592651A (en) | Active-passive imaging system for cat eye target detection | |
| CN110673112A (en) | Stripe tube laser radar distance gate control method and device | |
| CN107272010B (en) | Distance sensor, distance measuring method thereof and 3D image sensor | |
| CN107367736B (en) | High-speed laser range unit | |
| CN201748900U (en) | Self-adaptive displacement measuring device for ambient light | |
| CN102944879A (en) | Four-dimensional imaging device based on MEMS two-dimensional scan mirror and imaging method of imaging device | |
| CN106405566A (en) | High-measurement-precision laser radar distance measurement method | |
| Beer et al. | Coincidence in SPAD-based time-of-flight sensors | |
| CN107505628B (en) | Optical phased array variable resolution imaging system and method | |
| CN101770030A (en) | Distance measuring device and control method thereof | |
| CN102401901A (en) | Distance measurement system and distance measurement method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20110216 Effective date of abandoning: 20120905 |