CN201255636Y

CN201255636Y - Photoelectric conversion and amplification device for laser distance measuring instrument

Info

Publication number: CN201255636Y
Application number: CNU2008201621659U
Authority: CN
Inventors: 金天; 郑国军; 刘崇求
Original assignee: JINHUA LANHAI PHOTOELECTRIC TECHNOLOGY Co Ltd
Current assignee: JINHUA LANHAI PHOTOELECTRIC TECHNOLOGY Co Ltd
Priority date: 2008-08-07
Filing date: 2008-08-07
Publication date: 2009-06-10
Anticipated expiration: 2018-08-07

Abstract

The utility model relates to a photoelectric conversion and amplification device for a laser distance measuring instrument, which belongs to the technical field of laser distance measuring instrument. The device comprises a light sensing element (11), a transduction element (22), a pre-posed voltage amplification circuit (33), an amplification module with inverse feedback and an impedance conversion module (44); the device is characterized in that the light sensing element (11) consists of a PIN photodiode; the transduction element (22) consists of a resistor R; the pre-posed voltage amplification circuit (33) comprises a field effect tube V2, a resistor R7, a resistor R8 and a capacitor C3; the amplification module with the inverse feedback and the impedance conversion module (44) comprise transistors V1, Q1 and Q2, resistors R3, R4, R6, R10, R11, R12, R13 and R14, and capacitors C7, C8, C9, C10 and C12. The device not only can improve the reflecting and receiving sensitivity, signal amplification quality and distance measurement precision and increase the measurement distance, but also has low cost, and is acceptable by the civil market.

Description

The opto-electronic conversion and the multiplying arrangement that are used for laser range finder

Technical field

The utility model belongs to the laser range finder technical field, is specifically related to a kind of opto-electronic conversion and multiplying arrangement that is used for laser range finder.

Background technology

It mainly is that reflection receives and be converted into electric signal that the light signal of laser range finder receives, because of reflection received signal distance when far away signal quite faint, and can be subjected to extraneous other interference, thus receive and the processing signals difficulty very big.In order to overcome above-mentioned fraud, existing reception and amplifying technique, as United States Patent (USP) 5,612, No. 779, in bulletin on October 16th, 2002, notification number is that the CN1374533 Chinese patent all is for No. 01109414.1 by the following technical solutions:

1. adopt highly sensitive avalanche photodide;

2. adopt integrated trsanscondutance amplifier or Technitron to amplify as prime;

Adopt technique scheme, because the avalanche photodide operating voltage is than higher, its power supply loop of boosting can produce other circuit and disturbs the particularly interference that prime is amplified; For being applied to civilian hand-held product, because device prices such as highly sensitive avalanche photodide, integrated trsanscondutance amplifier are extremely expensive, so be difficult to be connect by market; And adopt triode to amplify as prime, and because the poor heat stability of triode, the radiation resistance ability is relatively poor, noise figure is bigger, so can influence the property of the entire circuit ratio of making an uproar, influence range finding distance and precision.

Summary of the invention

The purpose of this utility model is opto-electronic conversion and the multiplying arrangement that a kind of laser range finder will be provided, and it not only can improve the sensitivity that reflection receives, and improves the quality and the distance measuring precision of amplifying signal, increases the range finding distance; And cost is low, can be accepted by the commercial market.

Above-mentioned goal of the invention is achieved through the following technical solutions, a kind of opto-electronic conversion and multiplying arrangement that is used for laser range finder, it comprises: Photosensing Units 11, conversion element 22, forward voltage amplifying return circuit 33, have degenerative amplification module and impedance conversion module 44, it is characterized in that Photosensing Units 11 is made up of PIN photodiode, conversion element 22 is made up of resistance R.

The opto-electronic conversion of above-mentioned laser range finder and multiplying arrangement, one of its structure are that the forward voltage amplifying return circuit comprises field effect transistor V2, resistance R 7, R8, reaches capacitor C 3.

The opto-electronic conversion of above-mentioned laser range finder and multiplying arrangement, one of its structure are to have degenerative amplification module and impedance conversion module 44, comprise transistor V1, Q1, Q2, reach resistance R 3, R4, R6, R10, R11, R12, R13, R14; Capacitor C 7, C8, C9, C10, C12.

Opto-electronic conversion that is used for laser range finder and multiplying arrangement that the utility model provides, beneficial effect is: one, overall cost is low: because the utility model has adopted cheap PIN photodiode as Photosensing Units, adopt the high frequency field effect transistor as preposition amplification, use avalanche photodide and application integration trsanscondutance amplifier as opto-electronic conversion and amplifying return circuit than prior art, overall cost is all low a lot, helps the use in the civilian laser range finder of hand-held.

Two, the higher property ratio of making an uproar: owing to adopted PIN photodiode, its operating voltage is reduced significantly, and the power consumption of feed circuit is reduced, and the radiation interference of external circuit is reduced; The high frequency field effect transistor that adopted that temperature stability is good, capability of resistance to radiation is strong, noise figure is very little is as preposition amplification, use the circuit of triode compared to existing technology as preposition amplification, temperature stability will be got well, noise figure is little, thereby the property of entire circuit is made an uproar than increase, improve the quality and the distance measuring precision of amplifying signal, increase the range finding distance.

Three, the mode that the utility model has adopted capacitance-resistance to separate is carried out filtering and decoupling, and more effective elimination has improved the small-signal quality with source signal and other interference; And back level amplifying circuit has adopted negative feedback, impedance conversion structure, makes circuit more stable.

Description of drawings

Fig. 1: the utility model structured flowchart

Fig. 2: the utility model structural representation

Among Figure 12,11-Photosensing Units is a PIN photodiode, and 22-conversion element is resistance R 9,33-forward voltage amplifying return circuit, 44-have degenerative amplification module and an impedance conversion module

Embodiment

By Fig. 1-2 represented be the utility model one embodiment, it comprises: Photosensing Units 11, conversion element 22, forward voltage amplifying return circuit 33 has degenerative amplification module and impedance conversion module 44; Photosensing Units 11 is made up of PIN photodiode; Conversion element 22 is made up of resistance R 9; Forward voltage amplifying return circuit 33 comprises: field effect transistor V2, resistance R 7, R8, and capacitor C 3; Have degenerative amplification module and impedance conversion module 44 comprises: comprise transistor V1, Q1, Q2, and resistance R 3, R4, R6, R10, R11, R12, R13, R14; Capacitor C 7, C8, C9, C10, C12.

Concrete structure is as follows: the anodal end of PIN photodiode is connected with capacitor C 2, resistance R 2, capacitor C 2 other ends are connected with power cathode, resistance R 2 other ends are connected with capacitor C 1, resistance R 1, and resistance R 1 other end is connected with power supply-Vcc, and capacitor C 1 other end is connected with power cathode; PIN photodiode negative pole one end is connected with the resistance R 9 of conversion element 22, the field effect transistor V2 of forward voltage amplifying return circuit 33; Field effect transistor V2 has a utmost point to be connected with capacitor C 3, the resistance R 7 of the ground connection in this loop, field effect transistor V2 have a utmost point and this resistance in circuit R8, with have the capacitor C 6 that degenerative amplification module and impedance conversion module 44 be connected and be connected, resistance R 7, resistance R 8 other ends are connected with capacitor C 5, resistance R 5; Capacitor C 5 other ends are connected with capacitor C 4 and ground connection, and resistance R 5, capacitor C 4 other ends are connected with the resistance R 3, the R4 that have degenerative amplification module and impedance conversion module 44; Capacitor C 6 other ends are connected with the triode V1 that has degenerative amplification module and impedance conversion module 44, resistance R 6; The components and parts that have in degenerative amplification module and impedance conversion module 44 loops connect as follows: transistor V1 grounded emitter, its collector and resistance R 4, R12 is connected, resistance R 12 other ends are connected with the base stage of transistor Q1, the emitter of transistor Q1 is connected with resistance R 11, the grounded collector of transistor Q1, resistance R 3 other ends and power Vcc, resistance R 10, capacitor C 7, C8, be connected, capacitor C 7, C8 other end ground connection, resistance R 10 other ends and resistance R 11 be end in addition, resistance R 13, capacitor C 9 is connected, capacitor C 9 other end ground connection, resistance R 13 other ends and transistor Q2 emitter, the capacitor C 10 of other end ground connection is connected, the base stage of transistor Q2 be connected with resistance R 6 and with the emitter of transistor Q1, one end of resistance R 11 links to each other, the resistance R 14 of the collector of transistor Q2 and other end ground connection, one end of capacitor C 12 links to each other; The collector of transistor Q2 also is connected with capacitor C 11 outside degenerative amplification module and impedance conversion module 44 loops, and capacitor C 11 is connected with C12, and capacitor C 11 other ends and OUT end join.

PIN Photosensing Units 11 in the above embodiments can work in reverse bias when receiving target object laser light reflected signal, export a current signal;

Conversion element 22 is that resistance R 9 is that PIN photodiode is same loop with Photosensing Units 11, and when PIN photodiode receives target object laser light reflected signal when exporting a current signal, resistance R9 converts a voltage signal on conversion element 22.

33 pairs of forward voltage amplifying return circuits be connected in conversion element 22 be voltage signal on the resistance R 9 amplify and by C6 every the output of straight back.

Having degenerative amplification module and impedance conversion module 44, mainly is that it has comprised two-stage and has amplified and impedance conversion with the voltage signal further amplification again of forward voltage amplifying return circuit 33 outputs.Transistor V1, Q1 and some resistance, electric capacity are formed, and are equivalent to the amplifier of a combination, and resistance R 6 is the base biasing resistor of transistor V1, also are a negative feedback resistor simultaneously, stablize quiescent point.Transistor Q1 and resistance R 11 are an emitter follower simultaneously, have carried out the impedance variation of signal, and the amplifying return circuit that the output Low ESR makes it to form with back level transistor Q2 and resistance R 14 connects.After amplifying, export every straight back, use for the laser range finder subsequent conditioning circuit by capacitor C 11.

In order to eliminate with source signal and other interference, general circuit adopts capacitance-resistance filter to carry out filtering, but present embodiment adopts capacitance-resistance filter to carry out filtering by resistance R 5, R13 and capacitor C 5, C10, and adopt the power supply of capacitance-resistance filter separation and the effect that the decoupling method effectively raises filtering by resistance R 10, R3 and capacitor C 4, C9, improved signal quality, made the signal of circuit output make an uproar than remarkable increase.

The foregoing description shows that the utility model is applied in the laser range finder, and it not only can improve the sensitivity that reflection receives, and improves the quality and the distance measuring precision of amplifying signal, increase the range finding distance, and cost is low, can be accepted by the commercial market.

Claims

1. an opto-electronic conversion and multiplying arrangement that is used for laser range finder, it comprises: Photosensing Units (11), conversion element (22), forward voltage amplifying return circuit (33), have degenerative amplification module and impedance conversion module (44), it is characterized in that Photosensing Units (11) is made up of PIN photodiode, conversion element (22) is made up of resistance R 9; Forward voltage amplifying return circuit (33) comprises field effect transistor V2, resistance R 7, R8 and capacitor C 3; Have degenerative amplification module and impedance conversion module (44) comprises transistor V1, Q1, Q2, resistance R 3, R4, R6, R10, R11, R12, R13, R14, capacitor C 7, C8, C9, C10, C12; Photosensing Units (11)-PIN photodiode negative pole one end is connected with the field effect transistor V2 of conversion element (22)-resistance R 9, forward voltage amplifying return circuit (33); The field effect transistor V2 of forward voltage amplifying return circuit (33) with have the capacitor C 6 that degenerative amplification module and impedance conversion module (44) be connected and be connected.