CN206460170U

CN206460170U - A kind of new pattern laser distance-measuring equipment

Info

Publication number: CN206460170U
Application number: CN201621214154.1U
Authority: CN
Inventors: 刘腾骥
Original assignee: SHENZHEN MYANTENNA RADIO FREQUENCY TECHNOLOGY Co Ltd
Current assignee: SHENZHEN MYANTENNA RADIO FREQUENCY TECHNOLOGY Co Ltd
Priority date: 2016-11-10
Filing date: 2016-11-10
Publication date: 2017-09-01
Anticipated expiration: 2026-11-10

Abstract

The utility model is related to a kind of new pattern laser distance-measuring equipment, it is characterised in that：The equipment includes phase-locked loop circuit, modulation transmitter, optical signal receiving circuit, optical lens and phase discriminator.The phase-locked loop circuit is connected with modulation transmitter, optical signal receiving circuit and phase discriminator respectively, produces high-frequency signal, local oscillation signal and reference signal.The utility model is worked using new single-shot list debit formula, it is not necessary to mechanical movable plate washer, it is not required that increase high frequency mixting circuit in addition, simplify circuit design, it is to avoid circuit devcie causes phase shift problem；Only with a modulation transmitter, unit cost is reduced, production procedure is reduced, also improves production efficiency.

Description

A kind of new pattern laser distance-measuring equipment

Technical field

The utility model is related to phase laser distance measurement field, and in particular to a kind of new pattern laser distance-measuring equipment.

Background technology

Due to laser high brightness, high directivity, high monochromaticity and the advantage of high coherence so that laser range finder is extensive Applied to fields such as building, interior decoration, industrial automations.Laser range finder key device in the market is used Semiconductor laser and avalanche diode composition are launched and reception system, and its general operation principle is：Semiconductor laser transmitter Launch the measuring beam through ovennodulation to testee, the measurement light that testee is reflected back is received by avalanche diode Beam, calculates radiating laser beams and receives the phase difference of light beam, you can determine range unit the distance between to testee.By Worked under various circumstances in rangefinder, semiconductor laser and avalanche diode are all to the more sensitive device of temperature change ratio Part, wherein semiconductor laser operating current is larger, is more easy to generation phase drift influenced by ambient temperature, causes measurement error inclined Greatly, tens millimeters can at most be reached.Occasion for requiring high-acruracy survey, this measurement error be it is unacceptable, because And how to improve measurement accuracy turns into technical barrier and break through direction that laser ranging industry development faces.

Utility model content

In view of this, in order to overcome present technical problem, the utility model is set there is provided a kind of new pattern laser ranging It is standby, improve measurement accuracy and improve the stability of a system.

To achieve the above object, the technical solution of the utility model is as follows：

The utility model provides a kind of new pattern laser distance-measuring equipment, it is characterised in that including：Phase-locked loop circuit, modulation hair Transmit-receive radio road, optical signal receiving circuit, optical lens and phase discriminator, the phase-locked loop circuit are believed with modulation transmitter, light respectively Number receiving circuit and phase discriminator connection, for producing high-frequency signal, local oscillation signal and reference signal；The modulation transmitter is used In access high-frequency signal and produce measuring beam；The optical signal receiving circuit is used to access local oscillation signal and optics is passed through in reception The laser reflection signal of lens focus, difference frequency signal is obtained through mixing；The phase discriminator is used to receive reference signal and difference frequency letter Number, and reference signal and difference frequency signal are entered into line phase relatively obtain phase difference, and then draw the distance value of testee.

Further, the modulation transmitter includes semiconductor laser tube and automatically controls current module, described partly to lead Volumetric laser pipe is used to access high-frequency signal and modulates generation measuring beam, and the current module that automatically controls is used to control work electricity The size of stream.

Further, the optical signal receiving circuit includes avalanche diode and photoelectric tube, the avalanche diode access Local oscillation signal, the photoelectric tube, which has, to be received and mixing double action, is received reflected light signal and is converted into the same of high frequency electrical signal When, and the high frequency electrical signal and local oscillation signal are mixed, demodulate low-frequency difference frequency signal.

Further, the optical signal receiving circuit also includes difference frequency signal amplifying circuit, is arranged on optical signal and receives electricity Between road and phase discriminator, for being amplified processing to the difference frequency signal that optical signal receiving circuit is exported.

From such scheme, the utility model is worked using new single-shot list debit formula, it is not necessary to can mechanically be lived Dynamic plate washer, it is not required that increase high frequency mixting circuit in addition, simplify circuit design, it is to avoid circuit devcie causes phase shift to be asked Topic；Only with a laser diode modulation transmitter, unit cost is reduced, production procedure is reduced, also improves production Efficiency.

Brief description of the drawings

The structural representation for the new pattern laser distance-measuring equipment that Fig. 1 provides for the embodiment of the utility model one.

The structural representation for the new pattern laser distance-measuring equipment that Fig. 2 provides for another embodiment of the utility model.

Embodiment

It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer Accompanying drawing in type embodiment, clear, complete description is carried out to the technical scheme in the utility model embodiment, it is clear that retouched The embodiment stated is only a part of embodiment of the utility model, rather than whole embodiments.Based on reality of the present utility model Apply example, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all Belong to the scope of the utility model protection.

With reference to the accompanying drawings, the embodiment to the utility model various aspects is described in further detail.

As shown in figure 1, controlling phase-locked loop circuit to produce high-frequency signal and local oscillation signal by software, its high frequency signal is adjusted Make and measuring beam is produced in semiconductor laser tube, local oscillation signal is fed on the avalanche diode of optical signal receiving circuit, lock Phase loop circuit also produces a reference signal simultaneously, is used as the bit comparison of phase discriminator phase.

Base reference signal is directly provided using phase-locked loop circuit is to the benefit of phase discriminator, it is to avoid signal is by multistage Phase jitter and drift are caused during processing of circuit, facilitates circuit sampling synchronous, than replacing interior light path using electric mixing schemes Signal is more stable, significantly improves phase drift problem.

When carrying out range measurement, the measuring beam of brewed high-frequency signal is irradiated to testee surface, is reflected back The laser signal come is focused on by optical lens, is received by optical signal receiving circuit and is converted into electric signal, the electric signal and local oscillator Signal obtains low-frequency difference frequency signal by mixer action, and by the signal, further amplification is sent to phase discriminator and reference signal Do phase bit comparison and obtain phase difference, so as to draw the distance value of measured object.

This novel circuit design directly produces base reference signal using phase-locked loop circuit, high using photoelectric tube cut-off frequency Up to 2GHz high frequency characteristics, by receiving circuit design with receiving and being mixed double action, receive reflected light signal and be converted into height While frequency electric signal, and the high frequency electrical signal and high-frequency local oscillation signal are mixed, demodulate low-frequency difference frequency signal, Phase discriminator sampling processing is sent into after amplification.

This programme greatly simplifies circuit design, it is to avoid signal is asked by the possible caused phase shift of multiple circuit links Topic, while also reducing caused phase drift affected by environment, improves measurement accuracy.The reference that phase-locked loop circuit is directly produced Reference signal, can be directly accessed phase discriminator sampling and use, by controlling switch can also be respectively connected to phase demodulation with difference frequency signal Device sampling is used.

For modulation transmitter by phase drift caused by environmental change, by detecting modulation transmitter work electricity Stream, current module FREQUENCY CONTROL modulation transmitter operating current is automatically controlled by software adjustment.

As shown in Fig. 2 R1 is modulation transmitter operating current sample resistance, it is real to be sent to single-chip microcomputer LD_DET interfaces through R2 When detect modulation transmitter operating current, software output PWM_OUT waveforms Q1 transistor bases, Q1 colelctor electrodes are connected to by R3 Modulation transmitter is connect, RF_MOD high-frequency modulation signals are modulated on modulation transmitter by C2.When modulation transmitter by Environmental change causes operating current to change with working time heating, and software changes in real time according to detection operating current size Become output control automatically current module waveform duty cycle, automatically control modulation transmitter operating current so as to realize, make modulation Radiating circuit working stability, reduces and produces phase drift, improves measurement accuracy.

In summary, the utility model is worked using new single-shot list debit formula, it is not necessary to mechanical movable plate washer, Also without other increase high frequency mixting circuit, simplify circuit design, it is to avoid circuit devcie causes phase shift problem；Only with One modulation transmitter, reduces unit cost, reduces production procedure, also improves production efficiency.

Embodiment described above only expresses several embodiments of the present utility model, and it describes more specific and detailed, But therefore it can not be interpreted as the limitation to the utility model the scope of the claims.It should be pointed out that for the common of this area For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to In protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.

Claims

1. a kind of new pattern laser distance-measuring equipment, it is characterised in that：Received including phase-locked loop circuit, modulation transmitter, optical signal Circuit, optical lens and phase discriminator, the phase-locked loop circuit respectively with modulation transmitter, optical signal receiving circuit and phase discriminator Connection, for producing high-frequency signal, local oscillation signal and reference signal；

The modulation transmitter is used to access high-frequency signal and produces measuring beam；

The optical signal receiving circuit is used to access local oscillation signal and receives the laser reflection signal focused on by optical lens, warp Mixing obtains difference frequency signal；

The phase discriminator compares for receiving reference signal and difference frequency signal, and reference signal and difference frequency signal being entered into line phase To phase difference, and then draw the distance value of testee.

2. new pattern laser distance-measuring equipment according to claim 1, it is characterised in that：The modulation transmitter includes partly leading Volumetric laser pipe is used to access high-frequency signal and modulates generation measurement light with current module, the semiconductor laser tube is automatically controlled Beam, it is described to automatically control the size that current module is used to control operating current.

3. new pattern laser distance-measuring equipment according to claim 1, it is characterised in that：The optical signal receiving circuit includes snow Diode and photoelectric tube are collapsed, the avalanche diode accesses local oscillation signal, and the photoelectric tube, which has, to be received and mixing double action, While reception reflected light signal is converted into high frequency electrical signal, and the high frequency electrical signal and local oscillation signal are mixed, demodulated Go out low-frequency difference frequency signal.

4. new pattern laser distance-measuring equipment according to claim 3, it is characterised in that：The optical signal receiving circuit also includes Difference frequency signal amplifying circuit, is arranged between optical signal receiving circuit and phase discriminator, for what is exported to optical signal receiving circuit Difference frequency signal is amplified processing.