CN204718583U - The phase laser distance measurement instrument of single phase-locked loop - Google Patents
The phase laser distance measurement instrument of single phase-locked loop Download PDFInfo
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- CN204718583U CN204718583U CN201520423565.0U CN201520423565U CN204718583U CN 204718583 U CN204718583 U CN 204718583U CN 201520423565 U CN201520423565 U CN 201520423565U CN 204718583 U CN204718583 U CN 204718583U
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- chip microcomputer
- frequency mixer
- distance measurement
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Abstract
The utility model discloses a kind of phase laser distance measurement instrument of single phase-locked loop, comprise phaselocked loop, generating laser, single-chip microcomputer, the first frequency mixer, laser pickoff and the second frequency mixer, the high frequency master oscillator frequenc mixing that the low frequency signal exported by single-chip microcomputer and phaselocked loop export produces local frequency, and this local frequency exports outer light path low frequency signal to one of them ADC mouth of single-chip microcomputer with the high frequency master oscillator frequenc mixing producing phase delay after outer light path; Another ADC mouth is given as interior light path low frequency signal by single-chip microcomputer direct output low frequency signal; The signal of synchronized sampling two ADC mouths while of single-chip microcomputer, the phase differential of both calculating.The utility model optimizes the structure of existing phase laser distance measurement instrument, reduces costs, and improves its distance accuracy.
Description
Technical field
The utility model relates to phase laser distance measurement instrument technical field, especially relates to a kind of phase laser distance measurement instrument of single phase-locked loop.
Background technology
Laser range finder, as contactless surveying instrument, the fields such as remote control, precision measurement, engineering construction, safety monitoring and Based Intelligent Control are widely used in, phase laser distance measurement instrument is high with its precision, power little He feature easily, be applicable to civilian category, have larger market and application prospect.The phase shift of ranging phase method by producing after measuring modulated light wave air-borne transmission, thus the distance of trying to achieve that light wave passes by.
Traditional phase laser distance measurement instrument principle of work is as shown in Figure 1: export high frequency distance measuring signal to generating laser by the Single-chip Controlling master phaselocked loop (shaking hereinafter referred to as main) that shakes, and export high-frequency signal+low frequency signal to distance measuring signal frequency mixer by Single-chip Controlling local oscillator phaselocked loop (hereinafter referred to as local oscillator).
The light wave (infrared light or laser) that generating laser sends modulate by the high frequency distance measuring signal that independently shakes, become modulated wave.This modulated wave enters laser receiver through outer light path reflection, and be focused on photoelectric device, light signal is converted into electric signal immediately.This electric signal is exactly the height quite distance measuring signal that modulated wave travels to and fro between through demodulation after survey line, and its phase place is delayed.Modulated wave directly enters laser receiver through interior light path and then phase delay does not occur.
The high frequency distance measuring signal of the phase delay after demodulation and the high-frequency signal+low frequency signal of range finding reference signal and local oscillator carry out photoelectricity mixing through distance measuring signal frequency mixer, after frequency-selecting is amplified, obtain a low frequency distance measuring signal and low frequency range finding reference signal respectively, low frequency distance measuring signal still remains the original phase delay of high frequency distance measuring signal.Single-chip microcomputer is sampled respectively to low frequency distance measuring signal and low frequency range finding reference signal, calculates the phase delay results travelling to and fro between survey line.
But in concrete practice process, we find, above-mentioned existing phase laser distance measurement instrument exists following problem: 1, have two frequency generators in system, main shake phaselocked loop and local oscillator phaselocked loop, cost compare is high; 2, two low frequency signals produced after mixing, need a missing signal of synchronized sampling, and sampled result deviation not so can be caused large; 3, inside and outside light path needs to use physical switch to switch, comparatively loaded down with trivial details; 4, frequency computation part is complicated, and phase-lock-ring output frequency needs repeatedly to verify; 5, use the timesharing of same ADC mouth to carry out signal sampling, spended time is long, and data are not real-time.Because in conventional phase formula laser range finder, the high-frequency signal of outer light path and interior light path is not enter laser receiver simultaneously.In fact, in a laser ranging, first only allow outer light path enter receiving trap, after completing ADC waveform sampling, more only allow interior light path enter receiving trap, complete ADC waveform sampling, the phase differential both finally calculating.Under this operation, light path waveform sampling data inside and outside can finding these two sections are not occur at one time.If so switching time is fast not, final calculation result deviation will be caused large.
Utility model content
The purpose of this utility model is the defect overcoming prior art, provides a kind of phase laser distance measurement instrument of single phase-locked loop, to optimize the structure of existing phase laser distance measurement instrument, reduces costs, and improves its distance accuracy.
For achieving the above object, the utility model proposes following technical scheme: a kind of phase laser distance measurement instrument of single phase-locked loop, comprise phaselocked loop, generating laser, single-chip microcomputer, the first frequency mixer, laser pickoff and the second frequency mixer, described single-chip microcomputer has an ADC pin and the 2nd ADC pin
Described phaselocked loop exports high frequency master oscillator frequenc to described generating laser and the first frequency mixer;
Described generating laser sends light wave and is modulated into modulated wave through described high frequency master oscillator frequenc and sends to described laser receiver;
Described single-chip microcomputer output low frequency signal is given described first frequency mixer and described low frequency signal is directly exported to the 2nd ADC pin as interior light path low frequency signal;
The described high frequency master oscillator frequenc received and described low frequency signal mixing are exported local frequency to described second frequency mixer by described first frequency mixer;
Modulated wave described in described laser pickoff demodulation high frequency master oscillator frequenc after exporting phase delay gives described second frequency mixer;
High frequency master oscillator frequenc mixing after the described local frequency received and phase delay is produced outer light path low frequency signal to an ADC pin of described single-chip microcomputer by described second frequency mixer;
The low frequency signal of described single-chip microcomputer an ADC pin described in synchronized sampling and outer, interior light path corresponding to the 2nd ADC pin simultaneously, calculates both phase differential.
Preferably, also comprise and exporting and control inputs device with the data of described single-chip microcomputer two-way communication.
Preferably, described data export and control inputs device is at least button and segment code type liquid crystal or bluetooth cellular phone.
Preferably, also connect a Hi-pass filter between described first frequency mixer and the second frequency mixer, described local frequency exports uppermixing signal to described second frequency mixer through described Hi-pass filter.
Preferably, also connect one first low-pass filter between described first frequency mixer and the second frequency mixer, described local frequency exports lower mixed frequency signal to described second frequency mixer through described first low-pass filter.
Preferably, also connect one second low-pass filter between described second frequency mixer and a described ADC pin, the signal for exporting described second frequency mixer carries out low passband ripple and exports described outer light path low frequency signal to an ADC pin of described single-chip microcomputer.
Preferably, the upstream of described single-chip microcomputer the 2nd ADC pin also arranges one the 3rd low-pass filter, and the low frequency signal that described single-chip microcomputer exports exports described interior light path low frequency signal to the 2nd ADC pin after described 3rd low-pass filter filters.
Preferably, described second frequency mixer and laser pickoff are integrated in an avalanche photodide, both can be replaced with an avalanche photodide (APD).
The beneficial effects of the utility model are:
1, only use a phaselocked loop, produce the main signal that shakes, reduce costs.
2, use 2 ADC pins, synchronously carry out ADC signal sampling simultaneously, ensure that inside and outside optical path signal is synchronous, eliminate ADC sampling synchronization clock, also do not need inside and outside light path change-over switch, simplify the structure design, too increases the reliability of sample rate and result of calculation simultaneously.
3, use frequency mixer to produce local oscillation signal, frequency does not need to calculate, and considers whether local oscillation signal can lock so do not spend.
Accompanying drawing explanation
Fig. 1 is the principle schematic of existing phase laser distance measurement instrument;
Fig. 2 is the principle schematic of the phase laser distance measurement instrument of the utility model embodiment single phase-locked loop.
Embodiment
Below in conjunction with accompanying drawing of the present utility model, clear, complete description is carried out to the technical scheme of the utility model embodiment.
As shown in Figure 2, the phase laser distance measurement instrument of a kind of single phase-locked loop that the utility model embodiment discloses, comprise data to export and control inputs device, single-chip microcomputer, phaselocked loop, generating laser, the first frequency mixer, laser pickoff, wave filter, the first low-pass filter, the second low-pass filter and the second frequency mixer, single-chip microcomputer has an ADC pin and the 2nd ADC pin two thief hatchs.
Data export and control inputs device and single-chip microcomputer two-way communication, for the output of the input and measurement data of carrying out control data, data export and control inputs device generally can use button and segment code type liquid crystal, fraction of laser light stadimeter uses bluetooth cellular phone communication, and other equipment that can realize data input and output are suitable for too certainly.
Single-chip Controlling phaselocked loop exports a high frequency master oscillator frequenc to generating laser and the first frequency mixer, directly exports a low frequency signal simultaneously.Single-chip microcomputer can adopt STM32 series monolithic.
Generating laser is used for sending light wave, and this light wave exports modulated wave and sends to laser receiver after the high frequency master oscillator frequenc modulation that phaselocked loop exports; The high frequency master oscillator frequenc after phase delay be exported to the second frequency mixer after this modulated wave of laser pickoff demodulation.
First frequency mixer receives the high frequency master oscillator frequenc of phaselocked loop and the low frequency signal of single-chip microcomputer, and both mixing generation local frequencies are exported to filter filtering.Here wave filter can adopt high pass or the first low-pass filter, when selecting Hi-pass filter, exports uppermixing signal to the second frequency mixer after filtering; When selecting the first low-pass filter, after filtering, export lower mixed frequency signal to the second frequency mixer.Local frequency in the utility model is produced by single-chip microcomputer oneself, compared with prior art, structurally eliminate a phaselocked loop, and local frequency does not need to calculate, if the timer clock of sampling has certain deviation, so same low frequency also has identical deviation, and final sampling still can meet a cycle fixing sampling number.
Second frequency mixer receives the high frequency master oscillator frequenc of laser pickoff and the up/down mixed frequency signal after filters filter, and both are carried out mixing, the signal that mixing produces is exported to the second low-pass filter and is filtered, and exports outer light path low frequency signal to an ADC pin of single-chip microcomputer after filtering.
In addition, the low frequency signal that single-chip microcomputer exports is after the 3rd low-pass filter filters, and in exporting, light path low frequency signal is to the 2nd ADC pin of single-chip microcomputer.
The low frequency signal of single-chip microcomputer simultaneously outer, interior light path corresponding to synchronized sampling the one ADC pin and the 2nd ADC pin place, calculates both phase differential.The utility model adopts two ADC pins of single-chip microcomputer synchronously to carry out ADC signal sampling simultaneously, and eliminate ADC sampling synchronization clock, also do not need inside and outside light path change-over switch, simplify the structure design, too increases the reliability of sample rate and result of calculation simultaneously.The principle that single-chip microcomputer calculates phase differential is known technology, just repeats no more here.
As interchangeable, can the second frequency mixer in such scheme and laser pickoff be integrated in an APD, both can be replaced with an avalanche photodide (APD), realize laser pick-off and mixing by APD.
Technology contents of the present utility model and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from the utility model spirit based on teaching of the present utility model and announcement; therefore; the utility model protection domain should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present utility model and modification should be comprised, and contained by present patent application claim.
Claims (8)
1. a phase laser distance measurement instrument for single phase-locked loop, is characterized in that: comprise phaselocked loop, generating laser, single-chip microcomputer, the first frequency mixer, laser pickoff and the second frequency mixer, and described single-chip microcomputer has an ADC pin and the 2nd ADC pin,
Described phaselocked loop exports high frequency master oscillator frequenc to described generating laser and the first frequency mixer;
Described generating laser sends light wave and is modulated into modulated wave through described high frequency master oscillator frequenc and sends to described laser receiver;
Described single-chip microcomputer output low frequency signal is given described first frequency mixer and described low frequency signal is directly exported to the 2nd ADC pin as interior light path low frequency signal;
The described high frequency master oscillator frequenc received and described low frequency signal mixing are exported local frequency to described second frequency mixer by described first frequency mixer;
Modulated wave described in described laser pickoff demodulation high frequency master oscillator frequenc after exporting phase delay gives described second frequency mixer;
High frequency master oscillator frequenc mixing after the described local frequency received and phase delay is produced outer light path low frequency signal to an ADC pin of described single-chip microcomputer by described second frequency mixer;
The low frequency signal of described single-chip microcomputer an ADC pin described in synchronized sampling and outer, interior light path corresponding to the 2nd ADC pin simultaneously, calculates both phase differential.
2. the phase laser distance measurement instrument of single phase-locked loop according to claim 1, is characterized in that, also comprises and exporting and control inputs device with the data of described single-chip microcomputer two-way communication.
3. the phase laser distance measurement instrument of single phase-locked loop according to claim 2, is characterized in that, described data export and control inputs device is at least button and segment code type liquid crystal or bluetooth cellular phone.
4. the phase laser distance measurement instrument of single phase-locked loop according to claim 1, it is characterized in that, also connect a Hi-pass filter between described first frequency mixer and the second frequency mixer, described local frequency exports uppermixing signal to described second frequency mixer through described Hi-pass filter.
5. the phase laser distance measurement instrument of single phase-locked loop according to claim 1, it is characterized in that, also connect one first low-pass filter between described first frequency mixer and the second frequency mixer, described local frequency exports lower mixed frequency signal to described second frequency mixer through described first low-pass filter.
6. the phase laser distance measurement instrument of single phase-locked loop according to claim 1, it is characterized in that, also connect one second low-pass filter between described second frequency mixer and a described ADC pin, the signal for exporting described second frequency mixer carries out low passband ripple and exports described outer light path low frequency signal to an ADC pin of described single-chip microcomputer.
7. the phase laser distance measurement instrument of single phase-locked loop according to claim 1, it is characterized in that, the upstream of described single-chip microcomputer the 2nd ADC pin also arranges one the 3rd low-pass filter, and the low frequency signal that described single-chip microcomputer exports exports described interior light path low frequency signal to the 2nd ADC pin after described 3rd low-pass filter filters.
8. the phase laser distance measurement instrument of single phase-locked loop according to claim 1, is characterized in that, described second frequency mixer and laser pickoff are integrated in an avalanche photodide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520423565.0U CN204718583U (en) | 2015-06-18 | 2015-06-18 | The phase laser distance measurement instrument of single phase-locked loop |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520423565.0U CN204718583U (en) | 2015-06-18 | 2015-06-18 | The phase laser distance measurement instrument of single phase-locked loop |
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| CN204718583U true CN204718583U (en) | 2015-10-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257237A (en) * | 2015-06-18 | 2016-12-28 | 上海诺司纬光电仪器有限公司 | The phase laser distance measurement instrument of single phase-locked loop |
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2015
- 2015-06-18 CN CN201520423565.0U patent/CN204718583U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106257237A (en) * | 2015-06-18 | 2016-12-28 | 上海诺司纬光电仪器有限公司 | The phase laser distance measurement instrument of single phase-locked loop |
| CN106257237B (en) * | 2015-06-18 | 2023-09-01 | 上海诺司纬光电仪器有限公司 | Phase type laser range finder of single phase-locked loop |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20151021 Effective date of abandoning: 20230901 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20151021 Effective date of abandoning: 20230901 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |