CN201845083U - Distance meter by utilizing accumulated pulse of high-reparative-frequency pulse laser for measuring distance automatically - Google Patents

Abstract

The utility model relates to a distance meter by utilizing accumulated pulse of a high-reparative-frequency pulse laser for measuring distance automatically. The distance meter comprises a high-reparative-frequency pulse laser emitter, a high-sensitivity high-speed photoelectric detection receiving unit, an energy accumulating unit, a synchronization time delay unit and an automatic distance judgment unit, wherein the synchronization time delay unit is used for controlling between the high-reparative-frequency pulse laser emitter and the high-sensitivity high-speed photoelectric detection receiving unit, and the high-sensitivity high-speed photoelectric detection receiving unit comprises an automatic delay time scanner, an optical pulse counter, an energy signal acquisition unit, an energy signal release controller, a memory for this time, a memory for last time, a comparator and a distance calculator. Compared with the pulse distance meter by utilizing a solid laser, the distance meter in the utility model has the advantages of high repetition frequency, high photoelectric efficiency, good stability and long service life, can work continuously for a long time and is easy to research, develop and produce.

Description

A kind of stadimeter that adopts high recurrent frequency pulse laser device accumulative total pulse automatic range

Technical field

The utility model relates to a kind of stadimeter that adopts the method for high recurrent frequency pulse laser device accumulative total pulse automatic range.

Background technology

The long distance laser stadimeter all adopts impulse method usually, by nanosecond high-power laser pulse of transmitter emission, receiver receives echo-pulse, and timekeeping system is calculated laser pulse from being transmitted into the time of returning, calculate distance L according to laser flying time t and light velocity c then, i.e. L=ct/2.Impulse method laser ranging development is ripe relatively, general remote employing Q-switch solid laser, the emission laser peak power is more than myriawatts up to a hundred, it is burnt that pulse energy reaches several milli Jiao to tens millis, because power is very high, so continuously long-time use the laser crystal damage very big, so Q-switch solid laser is difficult to accomplish high repetition and works long hours continuously that and the life-span is subjected to the restriction of crystal and pumping source.Because adopt laser crystal and optical system tracking Q energy storage, the total system electro-optical efficiency is very low usually, the efficient laser pulse energy in fact seldom.Though use the pulse laser range finder of semiconductor laser not have the problems referred to above and since at present the peak power of impulse semiconductor laser the highest usually at several hectowatts to kilowatt magnitude, only suitable km is with interior laser ranging.

And the Laser Range Finding Based on Phase machine needs stronger reflection wave usually, all can place cooperative targets such as reflective mirror during telecommute at the target place, has limited its range of application.

The development of the pulse optical fiber of high repetition in recent years is rapid, have efficient height, long working life, reliable and stable, use advantages such as simple.But at present the pulse peak power of fiber laser at several kilowatts in tens kilowatts, single pulse energy has only several little Jiao to up to a hundred little Jiao, be difficult to realize the long distance laser range finding with individual pulse, the laser range finder of present using light fibre laser, but all be to adopt conventional individual pulse method to carry out, operating distance is restricted, and only is fit to in-plant scanning range finding or stereoscanning range finding imaging.But can utilize its high repetition frequency, generally can reach per second up to ten thousand times to up to a million times, thousands of pulses of accumulation are adopted in range finding each time, and accumulation can be managed and can reach the burnt above magnitude of milli like this, satisfies remote range finding demand.Except fiber laser, the development of semiconductor laser has also represented the potential ability of this respect, individual pulse is difficult to accomplish that several milli Jiao to tens are burnt in the least, but can accomplish high repetition, and the same like this long distance laser of can realizing by the side of multiple-pulse accumulation is found range.

Summary of the invention

The utility model is at the existing in prior technology shortcoming, and a kind of stadimeter that can adopt the method for high recurrent frequency pulse laser device accumulative total pulse automatic range is provided, this scheme is utilized its high repetition frequency, generally can reach per second up to ten thousand times to up to a million times, thousands of pulses of accumulation are adopted in range finding each time, accumulation can be managed and can reach the burnt above magnitude of milli like this, satisfies remote range finding demand.

The utility model is realized by following technical measures: a kind of stadimeter that adopts the method for high recurrent frequency pulse laser device accumulative total pulse automatic range, it comprises the high recurrent frequency pulse laser transmitter, the high sensitivity high speed optoelectronic is surveyed receiving element, the energy accumulation unit, the synchronizing relay unit, distance is judging unit automatically; Be subjected to the synchronizing relay unit controls between described high recurrent frequency pulse laser transmitter and the photodetection receiving element, the automatic judging unit of described distance comprises that delay time autoscanner, optical pulse counter, energy signal collecting unit, energy signal discharge controller, this external memory, last stored device, comparer and distance calculator;

Described high recurrent frequency pulse laser transmitter is connected with optical pulse counter with the synchronizing relay unit, the synchronizing relay unit is also surveyed receiving element with the high sensitivity high speed optoelectronic and is connected, the high sensitivity high speed optoelectronic is surveyed receiving element and also is connected with the energy accumulation unit, the energy accumulation unit also is connected with the energy signal collecting unit, the energy signal collecting unit also discharges controller with energy signal and is connected with this external memory, energy signal discharges controller and also is connected with the energy accumulation unit, this external memory is connected with comparer, this external memory also is connected with the last stored device, the last stored device also is connected with comparer, and comparer also is connected with distance calculator; Described optical pulse counter also is connected with the energy signal collecting unit with the delay time autoscanner, and described delay time autoscanner is connected with the synchronizing relay unit, and described delay time autoscanner also is connected with distance calculator.

The beneficial effect of this programme can be learnt according to the narration to such scheme, adopt the tellurometer of solid state laser relatively now, it have repetition frequency height, photoelectric efficiency height, good stability, can long time continuous working, the life-span is long, be easy to advantages such as research and development and production.And for the stadimeter of the fiber laser of present routine, its energy accumulation be the hundreds of of individual pulse energy to thousands of times, so measuring distance improves greatly, improves an order of magnitude at least.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment.

Among the figure, 1, the high recurrent frequency pulse laser transmitter, 2, the synchronizing relay unit, 3, photodetection receiving element, 4, energy accumulation unit, 5, optical pulse counter, 6, the delay time autoscanner, 7, energy signal collecting unit, 8, energy signal discharges controller, and 9, this external memory, 10, the last stored device, 11, comparer, 12, distance calculator.

Embodiment

For clearly demonstrating the technical characterstic of this programme,, this programme is set forth below by an embodiment.

As shown in Figure 1, a kind of stadimeter that uses the method for high recurrent frequency pulse laser device accumulative total pulse automatic range, it comprises high recurrent frequency pulse laser transmitter 1, the high sensitivity high speed optoelectronic is surveyed receiving element 3, energy accumulation unit 4, synchronizing relay unit 2, distance is judging unit 13 automatically; Be subjected to 2 controls of synchronizing relay unit between described high recurrent frequency pulse laser transmitter 1 and the photodetection receiving element 3, the automatic judging unit 13 of described distance comprises that delay time autoscanner 6, optical pulse counter 5, energy signal collecting unit 7, energy signal discharge controller 8, this external memory 9, last stored device 10, comparer 11 and distance calculator 12;

Described high recurrent frequency pulse laser transmitter 1 is connected with optical pulse counter 5 with synchronizing relay unit 2, synchronizing relay unit 2 is also surveyed receiving element 3 with the high sensitivity high speed optoelectronic and is connected, the high sensitivity high speed optoelectronic is surveyed receiving element 3 and also is connected with energy accumulation unit 4, energy accumulation unit 4 also is connected with energy signal collecting unit 7, energy signal collecting unit 7 also discharges controller 8 with energy signal and is connected with this external memory 9, energy signal discharges controller 8 and also is connected with energy accumulation unit 4, this external memory 9 is connected with comparer 11, this external memory 9 also is connected with last stored device 10, last stored device 10 also is connected with comparer 11, and comparer 11 also is connected with distance calculator 12; Described optical pulse counter 5 also is connected with energy signal collecting unit 7 with delay time autoscanner 6, and described delay time autoscanner 6 is connected with synchronizing relay unit 2, and described delay time autoscanner 6 also is connected with distance calculator 12.

The utility model course of work is as follows:

Suppose it is the n time scan period of autoscanner, high recurrent frequency pulse laser transmitter emission pulse laser, the pulsatile once signal is whenever received in the synchronizing relay unit, just picks up counting according to this delay time t+n Δ t that establishes, t is an initial delay time, and Δ t is poor for the scanning stepping time;

When timing is finished, trigger the shutter received pulse echo that the high sensitivity high speed optoelectronic is surveyed receiving element, close shutter after receiving, photosignal is deposited in the energy accumulation unit and is accumulated simultaneously;

Optical pulse counter whenever receives a light pulse and sends signal with regard to counting once, when counting reaches preset value N, this scan period finishes, in the energy accumulation unit, accumulated simultaneously N pulse echo energy signal, wherein, preset value N is provided with according to the single pulse energy situation of the high recurrent frequency pulse laser transmitter that adopts, usually at hundreds of to several thousand;

The optical pulse counter counting just triggers delay time autoscanner and energy signal collecting unit when expiring N, and the delay time autoscanner sends delay time t+ (n+1) Δ t to the synchronizing relay unit, prepares the n+1 time scanning;

From the energy accumulation unit, read the energy accumulation value after the energy signal collecting unit is triggered at once, and, prepare the accumulation of the n+1 time scanning by the cumlative energy signal in the energy signal release controller removing energy accumulation unit;

The energy signal collecting unit deposits the accumulated value of reading in this external memory, then by comparer with exist the signal value in the last stored device to compare, if this sub-value greater than last sub-value, then deposits this sub-value in the last stored device and overrides original signal, and begin the n+1 time scanning; If this sub-value less than or etc. go up sub-value, then comparer triggers distance calculator and calculates target range L=c (t+ (n-1) Δ t)/2 by time delays value t+ last time (n-1) Δ t, c is the light velocity, the while end of scan.

Principle of the present utility model is: since certain distance corresponding certain delay time, N laser pulse in each scan period, all be to be that identical delay time receives and with signal accumulation according to identical distance, if delay time and target range fit like a glove, then can obtain the strongest cumlative energy photosignal, do not have reflecting light because blocked by target at a distance than target, the distance nearer than target is air, its diffuse lightwave is than little many of target, therefore can must obtain the strongest photosignal at the target place by each stepping Δ t mistiming scanning from the close-by examples to those far off.

The utility model can pass through or adopt existing techniques in realizing without the technical characterictic of describing; do not repeat them here; certainly; above-mentioned explanation is not to be to restriction of the present utility model; the utility model also is not limited in above-mentioned giving an example; variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present utility model also should belong to protection domain of the present utility model.

Claims (1)

1. a stadimeter that adopts high recurrent frequency pulse laser device accumulative total pulse automatic range is characterized in that it comprises the high recurrent frequency pulse laser transmitter, the high sensitivity high speed optoelectronic is surveyed receiving element, the energy accumulation unit, the synchronizing relay unit, distance is judging unit automatically; Be subjected to the synchronizing relay unit controls between described high recurrent frequency pulse laser transmitter and the photodetection receiving element, the automatic judging unit of described distance comprises that delay time autoscanner, optical pulse counter, energy signal collecting unit, energy signal discharge controller, this external memory, last stored device, comparer and distance calculator;

Described high recurrent frequency pulse laser transmitter is connected with optical pulse counter with the synchronizing relay unit, the synchronizing relay unit is also surveyed receiving element with the high sensitivity high speed optoelectronic and is connected, the high sensitivity high speed optoelectronic is surveyed receiving element and also is connected with the energy accumulation unit, the energy accumulation unit also is connected with the energy signal collecting unit, the energy signal collecting unit also discharges controller with energy signal and is connected with this external memory, energy signal discharges controller and also is connected with the energy accumulation unit, this external memory is connected with comparer, this external memory also is connected with the last stored device, the last stored device also is connected with comparer, and comparer also is connected with distance calculator; Described optical pulse counter also is connected with the energy signal collecting unit with the delay time autoscanner, and described delay time autoscanner is connected with the synchronizing relay unit, and described delay time autoscanner also is connected with distance calculator.