CN200972412Y - Laser self-mixing interference vibration pickup - Google Patents
Laser self-mixing interference vibration pickup Download PDFInfo
- Publication number
- CN200972412Y CN200972412Y CNU2006200293215U CN200620029321U CN200972412Y CN 200972412 Y CN200972412 Y CN 200972412Y CN U2006200293215 U CNU2006200293215 U CN U2006200293215U CN 200620029321 U CN200620029321 U CN 200620029321U CN 200972412 Y CN200972412 Y CN 200972412Y
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- China
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- laser
- photoelectric conversion
- power supply
- output line
- instrument
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- Investigating Or Analysing Materials By Optical Means (AREA)
- Laser Surgery Devices (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses a laser self-mixing interference pick-up instrument, which comprises a cylinder shell with an upper bottom surface providing on the upper cylinder shell, and a lower bottom surface providing on the lower cylinder shell. The upper bottom surface is provided with a power supply and an outlet of signal output line. The inner spring of the upper bottom surface is connected to a cylinder mass block, and the inner of the lower bottom is fixed with a reflector; the inner of the mass block is provided with an inner drum used for fixing photoelectric conversion instrument. The input ends of laser and photo-detector powers are connected to external powers by laser and photo-detector power lines. The lower part of inner drum is equipped with an exit port, and the signal output line of photoelectric conversion instrument is connected to an external signal detection instrument. The utility model has the advantages of advantages of strong anti electromagnetic capability, high sensitivity, simple structure and the instrument can be made up into mini-type.
Description
Technical field:
The utility model is to belong to a kind of photoelectric conversion device, is specifically related to a kind of laser self-mixing translation interfere type vibro-pickup that vibration signal is converted to electric signal by laser.
Background technology:
Existing vibro-pickup product adopts electrical measuring method, Mechanical Method, optical method mostly, and electrical measuring method is highly sensitive but be subject to the interference of electromagnetic field; The Mechanical Method antijamming capability is strong, but frequency range, the range of linearity are narrow, and it is low to measure sensitivity; And in the vibration measurement with laser product, mostly be angled reflected light form greatly, the structure more complicated.
Summary of the invention:
The purpose of this utility model is according to the problems referred to above, and the laser self-mixing translation interfere type vibro-pickup that a kind of anti-electromagnetic interference capability is strong, simple in structure, can realize high-sensitivity measurement is provided.
The utility model is realized as follows: the circular bottom surface that round upper bottom surface that the vibro-pickup that the utility model proposes is provided with by column type shell, column type shell upper and bottom are provided with constitutes housing, described upper bottom surface is provided with power supply and output line outlet, at least 2 springs that described upper bottom surface inside bottom is provided with link to each other with cylindrical mass top, described cylindrical mass is to be subjected to the vibration can be up and down and the outer barrel wall frictionless motion, is fixed with catoptron on the inboard horizontal direction of described bottom surface; The interior bucket of fixed light electrical switching device is equipped with in described cylindrical mass inside, be fixed with photoelectric conversion device fixed mount and laser holder from top to down respectively in the interior bucket, photodetector and circuit board are housed on the photoelectric conversion device fixed mount, laser instrument is housed on the laser stent, the photodetector power input of laser instrument and photoelectric conversion device passes power supply by laser power supply line and photodetector power lead and the output line outlet is connected with external power supply, the bottom of interior bucket is provided with the laser emitting mouth, and the output line of photoelectric conversion device passes power supply and the output line outlet connects outside signal supervisory instrument.
Its principle of work is that vibro-pickup is placed on vibrating object inside to be detected, as geodetic shake information, geotechnical engineering investigation etc., can lay or method such as drill bit punching by level, the probe that vibro-pickup is housed is in depth following, cause the vibration of mass by external shock, thereby make the laser beam that is radiated on the reflective membrane carry the information relevant with the mass vibration regularity, and the flashlight with Doppler shift feeds back in the laser chamber by former road, in laser chamber, output power is modulated, light signal after the modulation penetrates and exports by photoelectric conversion device amplification back from the afterbody of laser instrument, thereby realize converting vibration signal to electric signal, and convert digital signal to by the A/D data acquisition unit and show by liquid crystal display.
The enough directions identical with the vibrating object velocity reversal of the utility model prodigiosin are measured, and laser instrument and photodetector in same direction, be same separate component form, this is that other laser acquisition types are unexistent.More apparent its advantage when the receiving optical signals direction is subjected to other direction restrictions.Owing to can adopt 0 measurement of angle, then the light signal light intensity is utilized to greatest extent, and signal to noise ratio (S/N ratio) is big.Anti-electromagnetic interference capability is strong, highly sensitive, compact conformation and can make advantages such as miniature.
Description of drawings:
Fig. 1 is the utility model laser self-mixing translation interfere type vibro-pickup structural representation.
Fig. 2 is the photoelectric conversion device structural representation.
Fig. 3 is a circuit diagram of the present utility model.
Fig. 4 is the circuit diagram of photoelectric conversion device.
In Fig. 1 to Fig. 4,1, shell 2, power supply and output line pipe 3, spring 4, oscillating mass piece 5, interior bucket 6, power supply and output line outlet 7, reflective mirror 8, upper bottom surface 9, bottom surface 10, laser power supply line 11, photodetector power lead 12, output line 13, photoelectric conversion device fixed mount 14, photodetector 15, laser stent 16, laser instrument 17, laser emitting mouth 18, circuit board.
LD: semiconductor laser R1-R4: resistance 3CD: triode 2CU: photodiode K; Switch.
Embodiment:
In Fig. 1, Fig. 2, the circular bottom surface 9 that round upper bottom surface 8 that vibro-pickup of the present utility model is provided with by column type shell 1, column type shell 1 top and bottom are provided with constitutes housing, described upper bottom surface 8 is provided with power supply and output line outlet 6, at least 2 springs 3 that described upper bottom surface 8 inside bottom are provided with link to each other with cylindrical mass 4 tops, described cylindrical mass 4 is to be subjected to the vibration can be up and down and the outer barrel wall frictionless motion, is fixed with catoptron 7 on the described bottom surface 9 inboard horizontal directions; The interior bucket 5 of fixed light electrical switching device is equipped with in described cylindrical mass 4 inside, be fixed with photoelectric conversion device fixed mount 13 and laser holder 15 from top to down respectively in the interior bucket 5, photodetector 14 and circuit board 18 are housed on the photoelectric conversion device fixed mount 13, laser instrument 16 is housed on the laser stent 15, the power input of the photodetector 14 of laser instrument 16 and photoelectric conversion device passes power supply by laser power supply line 10 and photodetector power lead 11 and output line outlet 6 is connected with external power supply, the bottom of interior bucket 5 is provided with laser emitting mouth 17, and the output line 12 of photoelectric conversion device passes power supply and output line outlet 6 connects outside signal supervisory instrument.
Among Fig. 3 and Fig. 4, semiconductor laser LD is by lead and resistance R
2, R
1The positive pole and the negative pole that connect photodiode 2CU respectively, the positive pole of 2CU connects the base stage of triode CD, and the collector of triode 3CD passes through resistance R
3, R
4And the positive pole of K switch connection battery, emitter is wired to the negative pole of battery, draws output line on the collector of triode 3CD.
During concrete the use, the laser instrument that is fixed on the vibro-pickup mass inside that is vibrating sends laser, impinge upon on the reflective mirror of shell inner bottom part from the below ejaculation, laser beam has the information relevant with oscillating mass slip gauge rule and has the flashlight of Doppler shift to feed back in the laser chamber and to laser power by former road after reflective mirror reflection modulates, location after the modulation number is penetrated and is amplified back output by photoelectric conversion device from the afterbody of laser instrument, make vibration signal be converted to electric signal, make the electric signal of reception enter A/D conversion and analytic system at last by laser.
Claims (1)
1, a kind of laser self-mixing translation interfere type vibro-pickup, it is characterized in that the circular bottom surface (9) that the round upper bottom surface (8) that is provided with by column type shell (1), column type shell (1) top and bottom are provided with constitutes housing, described upper bottom surface (8) is provided with power supply and output line outlet (6), at least 2 springs (3) that described upper bottom surface (8) inside bottom is provided with link to each other with cylindrical mass (4) top, are fixed with catoptron (7) on the inboard horizontal direction of described bottom surface (9); The interior bucket (5) of fixed light electrical switching device is equipped with in described cylindrical mass (4) inside, be fixed with photoelectric conversion device fixed mount (13) and laser holder (15) from top to down respectively in the interior bucket (5), photodetector (14) and circuit board (18) are housed on the photoelectric conversion device fixed mount (13), laser instrument (16) is housed on the laser stent (15), the power input of the photodetector (14) of laser instrument (16) and photoelectric conversion device passes power supply by laser power supply line (10) and photodetector power lead (11) and output line outlet (6) is connected with external power supply, the bottom of interior bucket (5) is provided with laser emitting mouth (17), and the output line of photoelectric conversion device (12) passes power supply and output line outlet (6) connects outside signal supervisory instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200293215U CN200972412Y (en) | 2006-09-07 | 2006-09-07 | Laser self-mixing interference vibration pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2006200293215U CN200972412Y (en) | 2006-09-07 | 2006-09-07 | Laser self-mixing interference vibration pickup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200972412Y true CN200972412Y (en) | 2007-11-07 |
Family
ID=38883667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2006200293215U Expired - Fee Related CN200972412Y (en) | 2006-09-07 | 2006-09-07 | Laser self-mixing interference vibration pickup |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200972412Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411065A (en) * | 2011-12-09 | 2012-04-11 | 安徽大学 | Laser self-mixing acceleration sensor |
-
2006
- 2006-09-07 CN CNU2006200293215U patent/CN200972412Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102411065A (en) * | 2011-12-09 | 2012-04-11 | 安徽大学 | Laser self-mixing acceleration sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |