CN203132505U - Portable non-contact cracks measuring instrument - Google Patents
Portable non-contact cracks measuring instrument Download PDFInfo
- Publication number
- CN203132505U CN203132505U CN 201320135790 CN201320135790U CN203132505U CN 203132505 U CN203132505 U CN 203132505U CN 201320135790 CN201320135790 CN 201320135790 CN 201320135790 U CN201320135790 U CN 201320135790U CN 203132505 U CN203132505 U CN 203132505U
- Authority
- CN
- China
- Prior art keywords
- crack
- measuring instrument
- image processor
- dsp
- liquid crystal
- 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 - Fee Related
Links
Images
Abstract
The invention relates to a portable non-contact cracks measuring instrument, which is characterized in that CCD is used for collecting crack images, and a DSP image processing algorithm is used for measuring the width of the cracks. The cracks measuring instrument provided by the invention has the advantages of low cost and simple operation, and is suitable for non-contact cracks measuring with high-precision.
Description
Technical field:
The utility model relates to a kind of noncontact crack measurement mechanism, specifically a kind of portable noncontact crack surveying instrument.
Background technology:
The crack measuring method is commonly used microfissue sensing method, digital camera method, digital image method etc.Patent 200920236196.9 discloses a kind of microfissue method for sensing with expansion link, by imaging, with the scale on the screen crack is measured, and this method need contact the crack, can't telemeasurement.Patent 200910055047.7 discloses a kind of device of remote digital photographic measurement fracture width, it uses digital camera to take the crack photo, demarcate reading with laser range finder, the Computer Processing image is calculated fracture width, though this device is telemeasurement, demarcates Pixel Dimensions with laser ranging and can make error bigger.
Summary of the invention:
The purpose of this utility model is to provide a kind of portable noncontact crack surveying instrument at the deficiencies in the prior art.This instrument adopts CCD and monolithic DSP microprocessor to carry out the noncontact crack and measures, and the measuring accuracy height is easy and simple to handle, is easy to carry.
The technical solution of the utility model:
A kind of portable noncontact crack measuring instrument, at its shell laser tube is housed, one side is embedded with liquid crystal display, opposite side fixation of C CD, enclosure has the DSP image processor, and laser tube sends two directional lights, incides on the crack, the DSP image processor calculates fracture width, and result of calculation is presented on the liquid crystal display.
Put fracture faces by the projection parallel laser, CCD gathers two luminous points and tested crack pattern picture, and the DSP image processor is handled image, looks like to do Pixel Dimensions by dot pattern and demarcates, and calculates fracture width.
The DSP image processor can adopt the TMS320DM642 chip, utilizes the grey scale centre of gravity algorithm to calculate the laser spots spot center, again by its width size of crack image calculation.
The measurement result of this instrument also can be transferred in data-carrier store or the database by wired or wireless mode.
The beneficial effects of the utility model are: compared with the prior art, the utility model is a kind of portable non-contact measuring device based on CCD and DSP, adopts common image processing program, algorithm is simple, and the measuring accuracy height is easy and simple to handle, easy to carry, cost is very limited.
Description of drawings:
Fig. 1 is structural representation of the present utility model.
Mark among the figure: 1 laser tube, 2CCD, 3DSP image processor, 4 liquid crystal displays, 5 shells, 6 cracks.
Embodiment:
As shown in Figure 1, portable noncontact crack surveying instrument.Comprise 1 laser tube, 2CCD, the 3DSP image processor,
4 liquid crystal displays, 5 shells, 6 cracks.
Described laser tube 1 sends two parallel lasers, is fixed on the shell 5.
Described DSP image processor 3 can adopt the DSP embedded based on the TMS320DM642 chip, and measurement result is presented on the small size liquid crystal display, is convenient to the measurement mechanism instrumentation.Measurement result also can be transferred in data-carrier store or the database in wired or wireless mode by the serial communication interface of DSP, as connect serial ports USB module and can be recorded on the USB flash disk file, connecing serial ports SD module can be recorded on the part of SD Cavan, connect the serial ports wireless module can with the server database wireless connections, also can be connected on the net by the network interface of DSP.
Laser tube 1 sends the directional light of 650nm wavelength, incides on the fracture faces, and CCD2 gathers image, and DSP image processor 3 calculates crack 6 width.Measuring principle is as follows:
As shown in Figure 1, establish two laser spots distance and be d, luminous point spacing pixel on image is s, and crack pixel on image is a, and fracture width b computing formula: b=(a*d)/s. is then arranged
Wherein distance s is obtained by image processing program.Adopt the grey scale centre of gravity formula:
In the formula T be dot pattern as gray threshold, f is each gray values of pixel points, x and y are luminous point gray scale centre coordinates.The difference of two luminous point grey scale centre of gravity coordinates is distance s.
The grey scale centre of gravity arithmetic accuracy is 0.02 pixel, and as corresponding 0.1 millimeter of every pixel in the image processing system, this device luminous point stated accuracy is 0.002 millimeter.
Claims (2)
1. portable noncontact crack measuring instrument, it is characterized in that: laser tube (1) is housed on the shell (5), one side is embedded with liquid crystal display (4), opposite side fixation of C CD(2), there is DSP image processor (3) shell (5) inside, and laser tube (1) sends two directional lights, incides on the crack (6), DSP image processor (3) calculates crack (6) width, and result of calculation is presented on the liquid crystal display (4).
2. a kind of portable noncontact according to claim 1 crack measuring instrument, it is characterized in that: measurement result also can be transferred in data-carrier store or the database by wired or wireless mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320135790 CN203132505U (en) | 2013-03-22 | 2013-03-22 | Portable non-contact cracks measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320135790 CN203132505U (en) | 2013-03-22 | 2013-03-22 | Portable non-contact cracks measuring instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203132505U true CN203132505U (en) | 2013-08-14 |
Family
ID=48940477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320135790 Expired - Fee Related CN203132505U (en) | 2013-03-22 | 2013-03-22 | Portable non-contact cracks measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203132505U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458562A (en) * | 2014-11-28 | 2015-03-25 | 中国航空工业集团公司北京航空材料研究院 | Measuring method for opening stress of crack |
| CN104567714A (en) * | 2013-10-15 | 2015-04-29 | 胡长华 | Portable non-contact roundness measurement instrument |
| CN106017341A (en) * | 2016-07-15 | 2016-10-12 | 湖北三江航天红阳机电有限公司 | Shaft hole part assembly gap monitoring system |
| CN110656927A (en) * | 2019-08-26 | 2020-01-07 | 中国矿业大学 | Fracture image measuring method based on borehole television |
-
2013
- 2013-03-22 CN CN 201320135790 patent/CN203132505U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104567714A (en) * | 2013-10-15 | 2015-04-29 | 胡长华 | Portable non-contact roundness measurement instrument |
| CN104458562A (en) * | 2014-11-28 | 2015-03-25 | 中国航空工业集团公司北京航空材料研究院 | Measuring method for opening stress of crack |
| CN106017341A (en) * | 2016-07-15 | 2016-10-12 | 湖北三江航天红阳机电有限公司 | Shaft hole part assembly gap monitoring system |
| CN106017341B (en) * | 2016-07-15 | 2019-05-28 | 湖北三江航天红阳机电有限公司 | A kind of shaft hole series component assembling gap monitoring system |
| CN110656927A (en) * | 2019-08-26 | 2020-01-07 | 中国矿业大学 | Fracture image measuring method based on borehole television |
| CN110656927B (en) * | 2019-08-26 | 2021-06-18 | 中国矿业大学 | Fracture image measuring method based on borehole television |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203132505U (en) | Portable non-contact cracks measuring instrument | |
| CN102538693B (en) | Vertical wood diameter detection method based on laser and vision technology | |
| CN108012143A (en) | Binocular camera scaling method and device | |
| CN203908495U (en) | Side-imaging image measuring instrument | |
| CN104173054A (en) | Measuring method and measuring device for height of human body based on binocular vision technique | |
| JP2013122434A (en) | Three-dimensional shape position measuring device by monocular camera using laser, method for measuring three-dimensional shape position, and three-dimensional shape position measuring program | |
| CN203100701U (en) | Portable non-contact leaf area measuring instrument | |
| CN202793376U (en) | Vision-based object tilt displacement settlement deformation monitoring system | |
| CN103499334A (en) | Method, apparatus and electronic instrument for distance measurement | |
| CN203100681U (en) | Portable non-contact dimension measuring apparatus | |
| CN105547159A (en) | Method of measuring object based on mobile terminal and mobile terminal | |
| CN104864810A (en) | Digital measuring method and device thereof | |
| CN104807407A (en) | Mobile phone length measuring method based on bank card | |
| CN104089607A (en) | Normal case photography forest metrology method through common digital camera | |
| CN201697611U (en) | Crack observer | |
| CN105222849A (en) | A kind of volumetric glass volumetric measurement system and method | |
| CN103940344A (en) | High-precision remote displacement sensor | |
| CN103884471B (en) | Center of gravity measurement method | |
| CN103644895A (en) | Surveying and mapping method for ancient architecture by matching digital camera with measuring tool | |
| CN207335722U (en) | For measuring the measuring device of verticality of stand column | |
| CN207365912U (en) | A kind of local laser-image co-registration measuring system for underwater object dimensional measurement | |
| CN103542912A (en) | Laser water level gauge based on laser distance measurement | |
| CN104567714A (en) | Portable non-contact roundness measurement instrument | |
| CN103217303B (en) | The method that 3D position indicators realize moveable measurement | |
| CN204314057U (en) | A kind of focal length measuring equipment for Diode laser camera lens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130814 Termination date: 20160322 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |