CN2537958Y

CN2537958Y - Semiconductor laser self mixing frequency interference sensor

Info

Publication number: CN2537958Y
Application number: CN02211611U
Authority: CN
Inventors: 邵静波; 王玉兰
Original assignee: Yanbian University
Current assignee: Yanbian University
Priority date: 2002-04-30
Filing date: 2002-04-30
Publication date: 2003-02-26
Anticipated expiration: 2012-04-30

Abstract

The utility model discloses a sensor, i.e. a semi-conductor laser self-mixing interference sensor. The main structure of the utility model is that: the inside of a shell is provided with a fixing frame, and the fixing frame is provided with a semi-conductor laser; a fixing frame on the front end of the semi-conductor is provided with lens, and a light transmission window is arranged on a shell in the light transmission direction of the lens; a fixing frame at the back of the semi-conductor laser is provided with a photoelectric detector, and the semi-conductor and the photoelectric detector are connected to a DC (direct current) power through wires, and the signal output end of the photoelectric detector is connected to a record and analysis system through wires. The utility model can measure the amplitude, speed etc. of a moving object, and is characterized in that the direction of the detecting beam of light and the direction of the moving speed of an object can be measured in parallel; the utility model has the advantages of simple structure, convenient operation and strong light signal.

Description

Semiconductor laser self-mixing interfere type sensor

Technical field:

The utility model relates to a kind of photoelectric sensor that is used for the inspected object motion, is specifically related to the semiconductor laser self-mixing interfere type sensor that it can accomplish that beam direction detects when parallel with movement direction of object.

Background technology:

Be used to the laser sensor measured at present, the general laser instrument that adopts separates use with photodetector, as when measuring the speed of object laser instrument and photodetector be placed on respectively the survey object both sides or constitute certain angle, have the problems such as inconvenient, complicated, that debugging difficulty is big of using.

Summary of the invention:

The utility model is that the light beam irradiates that laser instrument sends reflexes in the laser instrument again after detected material, and in laser instrument output power is modulated, and the light signal after the modulation outputs to record and analytic system by photodetector.

The utility model is realized as follows, the carriage center that is equipped with in the shell is provided with semiconductor laser, the front end of semiconductor laser is provided with lens, the shell of the printing opacity direction of lens is provided with light inlet window, the rear end of semiconductor laser is provided with photodetector, above-mentioned semiconductor laser also can adopt gas laser, and by the power supply of lead connection laser instrument and photodetector, the output terminal of photodetector connects record and analytic system by lead.Just lens can be used when detecting in-plant object, lens can be dismantled when detecting remote object.

The utility model is owing to can the direction identical with the moving object velocity reversal measure, and semiconductor laser and photodetector are in the same direction of measured object, and be arranged within the same device, therefore have advantages such as simple in structure, easy to use, low cost of manufacture.

Description of drawings:

Fig. 1 is the utility model semiconductor laser self-mixing interfere type sensor cross-sectional view.

Fig. 2 is the utility model semiconductor laser self-mixing interfere type sensor circuit figure.

Fig. 3 is the circuit diagram of photodetector of the present utility model.

In Fig. 1 to Fig. 3

1, lens 2, semiconductor laser 3, photodetector 4, shell 5, power source of semiconductor laser line 6, photodetector power lead 7, photo detector signal output line 8, light inlet window 9, lens mount 10, semiconductor laser seat 11, photodetector seat 12, fixed mount 13, junction block

LD in Fig. 2 and Fig. 3: semiconductor laser R: resistance CD: triode 2CU ₂A: photodiode

Embodiment:

In Fig. 1 to Fig. 3, shell of the present utility model 4 inboards are provided with fixed mount 12, the middle part of fixed mount 12 is provided with semiconductor laser seat 10, semiconductor laser 2 is equipped with on its top, the front portion of semiconductor laser 2 is that the front end of fixed mount 12 is provided with lens mount 9, lens 1 are equipped with on its top, the shell 4 of the printing opacity direction of lens 1 is provided with light inlet window 8, the input end of semiconductor laser 2 is connected direct supply by power source of semiconductor laser line 5 with junction block 13, the rear portion of semiconductor laser 2 is that the rear end of fixed mount 12 is provided with photodetector seat 11, photodetector 3 is equipped with on photodetector seat 11 tops, photodetector 3 is connected direct supply by photodetector power lead 6 with junction block 13, and the signal output part of photodetector 3 is by photo detector signal output line 7 and junction block 13 linkage records and analytical equipment.Semiconductor laser 2 also can be a gas laser, and semiconductor laser 2 and gas laser are to belong to prior art, and what photodetector 3 received is the tail light of semiconductor laser 2.Just lens 1 can be used when detecting closer object, lens 1 can be dismantled when detecting remote object.

Pass through power source of semiconductor laser line 5 and photodetector power lead 6 energized during concrete the use, simultaneously photo detector signal output line 7 is inserted record and analytic system, the rays pass through lens 1 that the front portion of semiconductor laser 2 is penetrated is radiated on the testee, laser beam is fed back in the chamber that is injected into semiconductor laser 2 and to laser power again after the testee reflection and is modulated, light beam after the modulation carries out difference frequency with same being admitted to of directly penetrating from the rear portion of semiconductor laser 2 of light beam the photodetector 3, the signal behind the difference frequency is exported to record and analytic system by photo detector signal output line 7.

Claims

1, a kind of semiconductor laser self-mixing interfere type sensor, it is characterized in that shell (4) inboard is provided with fixed mount (12), the middle part of fixed mount (12) is provided with semiconductor laser seat (10), semiconductor laser (2) is equipped with on its top, the front portion of semiconductor laser (2) is that the front end of fixed mount (12) is provided with lens mount (9), lens (1) are equipped with on its top, the shell (4) of the printing opacity direction of lens (1) is provided with light inlet window (8), the input end of semiconductor laser (2) is connected direct supply by power source of semiconductor laser line (5) with junction block (13), the rear portion of semiconductor laser (2) is that the rear end of fixed mount (12) is provided with photodetector seat (11), photodetector (3) is equipped with on photodetector seat (11) top, photodetector (3) is connected direct supply by photodetector power lead (6) with junction block (13), and the signal output part of photodetector (3) is by photo detector signal output line (7) and junction block (13) linkage record and analytical equipment.

2, semiconductor laser self-mixing interfere type sensor according to claim 1, what it is characterized in that described photodetector (3) reception is the tail light of semiconductor laser (2).

3, semiconductor laser self-mixing interfere type sensor according to claim 1 is characterized in that described semiconductor laser (2) can be a gas laser.