CN101216562A - Laser distance measuring system - Google Patents
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- CN101216562A CN101216562A CNA2007100729149A CN200710072914A CN101216562A CN 101216562 A CN101216562 A CN 101216562A CN A2007100729149 A CNA2007100729149 A CN A2007100729149A CN 200710072914 A CN200710072914 A CN 200710072914A CN 101216562 A CN101216562 A CN 101216562A
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Abstract
The invention relates to a laser ranging system, which comprises a transmitting module comprising a transmitting optical system and a laser emitter for emitting a pulsed laser signal; a receiving module comprising a receiving optical system and a laser receiver for receiving the pulsed laser signal and converting the pulsed laser signal to a pulsed electrical signal; a time/digital converter for detecting and calculating the time difference between the transmitting the pulse signal and the receiving the pulse signal; a clock generator for outputting a calibrated clock signal to the time/digital converter; and a single chip microcontroller for controlling the transmitting module, the receiving module, the time/digital converter and the clock generator and calculating the actual distance of a target object from the position of the laser ranging system according to the time difference. The inventive laser ranging system has the advantages of compact optical system, high accuracy in time difference detection, calculation and calibration, small size of the entire product, low cost, less error and high reliability.
Description
[technical field]
The present invention relates to a kind of laser distance measuring system, especially relate to a kind of employing pulse echo formula (TOF, the laser distance measuring system of Time-of-Flight) laser ranging mode.
[background technology]
Current existing laser range finder kind is more, utilizes the principle of laser ranging also to have multiple.At present, the principle used of laser ranging is broadly divided into three kinds of interfere type, phase type and pulse echo formulas:
One, interfere type laser ranging.The interfere type laser ranging mode vibrations of environment to external world is very responsive, and can only measure relative shift, so be fit to use in the stable precision measurement of minimum distance and external environment.
Two, phase type laser ranging.Phase type laser ranging mode resolution is higher, but because phase detectors can only measure the phase differential of two signals (transmitting and receiving laser pulse signal), when the half of phase differential above modulation wavelength, then is difficult for judging.Therefore measure long apart from the time, modulating frequency must be diminished, but this can make the resolution variation of distance.If will guarantee high resolution and big measurement range simultaneously, just must utilize several different modulating frequencies that same distance is measured, can increase the complexity of circuit system so greatly.Add that the material of different target thing can produce the influence of erroneous judgement to the phase place of echo, so must use a prism of corner cube to make object, make its phase of echo not be subjected to the influence of object material, just can obtain real actual range, and this is difficult in practical application reaching.And because will use continuous light wave output, strong excessively output power can injure human eye, and measuring distance will be limited because of the restriction of laser output power.
Three, pulse echo formula laser ranging.The pulse echo formula is laser pulse flight time TOF (Time-of-Flight) mode.
Generally speaking, the resolution of phase type laser ranging is than pulse echo formula laser ranging mode height, but the laser ranging of pulse echo formula but has following advantage: under the condition of identical overall average luminous power output, the measurable distance of pulse echo formula is than the length of phase type.This is because pulse laser can have very high moment Output optical power usually, the laser signal intensity that the object that makes distant place still can reflected back enough be detected.Single range finding speed is very fast, can repeatedly measure the increase accuracy.Because what phase detectors were measured is two relative phase differences between continuous signal, so phase type is also more time-consuming on Measuring Time, this is a unfavorable factor for the system that the high speed measuring rate must be arranged and repeatedly measure.The system architecture of pulse echo formula range finding is comparatively simple.On the not too high laser distance measuring system of resolution requirement, the pulse echo formula is to have the implementation of desirable framework.
Because the range finding of pulse echo formula is the mistiming of calculating between transmitted wave and reception echo to try to achieve testing distance, the main error that wherein influences range accuracy has: because of the rise time (rising edge) of the far and near different echo-pulses that produce of reflected by objects different in kind or measuring distance and the error that amplitude variations is brought, and the mistiming error of calculation of echo.The present applied mistiming computing method of pulse echo formula (TOF) laser ranging mode, its defective are circuit or complicated, or cost is higher, also or precision is low, resolution is low, stable and poor reliability.Adopt most of products of pulse echo formula laser ranging mode to exist optical system, physical construction and circuit to form all comparatively complicated shortcoming.
[summary of the invention]
The object of the present invention is to provide a kind of laser distance measuring system that adopts pulse echo formula laser ranging mode, it transmits and receives invisible laser signal, adopts high integration and high precision time difference counting circuit.Described laser distance measuring system optical system and mechanical realization are simple, and system is simple and easy, precision is high, error is little, reliable and stable, and cost is lower.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of laser distance measuring system, it comprises transmitter module and receiver module, described transmitter module comprises by diversing lens and installs optical transmitting system that the emission cavity of this diversing lens forms, and generating laser, via optical transmitting system emission pulse laser signal; Described receiver module comprises by receiver lens and installs receiving optics that the reception cavity of this receiver lens forms, and laser pickoff, via receiving optics received pulse laser signal and be translated into pulse electrical signal; Time/digital quantizer, the mistiming that is used to detect and calculate transponder pulse signal and received pulse signal; Clock generator, output calibration clock signal is given time/digital quantizer; And singlechip microcontroller, control described transmitter module, receiver module clock generator time/digital quantizer and clock generator, and calculate the actual distance of corresponding object and laser distance measuring system position according to the described mistiming.
Laser distance measuring system of the present invention adopts pulse echo formula principle, transmits and receives invisible laser signal, and adopts high integration and high precision time difference counting circuit.Optical system is succinct, the detection of mistiming, calculating and calibration are based on CMOS large scale integrated circuit " time/digital quantizer " the TDC circuit of high integration and realize, thereby the laser range finder machine product volume that achieves is little, system is simple and easy, degree of accuracy is high, error is little, reliable and stable, convenient reading is directly perceived, and cost is lower.Described laser distance measuring system can be applicable to laser range finder, laser rangefinder telescope, also can be applicable to laser velocimeter system, anti-collision system for automobile etc.
[description of drawings]
Fig. 1 is the integral module synoptic diagram of laser distance measuring system of the present invention.
Fig. 2 is the transmitter module and the receiver module synoptic diagram of laser distance measuring system of the present invention.
Fig. 3 is the final assembly synoptic diagram of laser distance measuring system of the present invention.
Fig. 4 is the principle of work synoptic diagram of laser distance measuring system of the present invention.
Fig. 5 a is the radiating circuit block diagram of laser distance measuring system of the present invention.
Fig. 5 b is the optical transmitting system synoptic diagram of laser distance measuring system of the present invention.
Fig. 6 a is the receiving circuit block diagram of laser distance measuring system of the present invention.
Fig. 6 b is the receiving optics synoptic diagram of laser distance measuring system of the present invention.
Fig. 7 be laser distance measuring system of the present invention time/digital quantizer TDC circuit theory diagrams.
[embodiment]
Describe the present invention below with reference to embodiment.
See also Fig. 1, Fig. 1 is the integral module synoptic diagram of laser distance measuring system of the present invention.Laser distance measuring system of the present invention comprises: transmitter module 100, receiver module 200, guided laser module 20, time/digital quantizer (TDC, Time-to-Digital Converter) 30, singlechip microcontroller (Single ChipMicrocontroller) 40, clock generator 50, with LCD liquid crystal display 60 backlight, keyboard 70, supply unit 80, JTAG (Joint Test Action Group, the boundary scan testing standard) emulation and debugging interface 90, and burning and demarcation interface 95.
See also Fig. 1 and Fig. 2, this transmitter module 100 further comprises: by diversing lens 125 and install the optical transmitting system that the emission cavity 128 of this diversing lens 125 is formed, pulsed laser diode 150, and be mainly used in the countdown circuit 130 of controlling this pulsed laser diode 150.
This receiver module 200 further comprises: by receiver lens 225 and install the receiving optics that the reception cavity 228 of this receiver lens 225 is formed, silicon PIN photodiode 250, and be mainly used in the reception control circuit 230 of controlling this silicon PIN photodiode 250.
This guided laser module 20 comprises: in order to the guided laser transmitter 22 of emission visible laser, and in order to the guided laser control circuit 24 of the switch of controlling this guided laser transmitter 22.
This supply unit 80 comprises battery 82 and power supervisor 84.
Please continue to consult Fig. 3, Fig. 3 is the final assembly synoptic diagram of laser distance measuring system of the present invention.Described laser distance measuring system integral installation is located at a housing, the optical transmitting system of transmitter module 100 wherein, the receiving optics of receiver module 200, and the guided laser transmitter 22 of guided laser module 20 is installed in the front end of housing, is convenient to launch, the outgoing of receiving optical signals and visible laser point.
And pulsed laser diode 150 and countdown circuit 130, silicon PIN photodiode 250 and reception control circuit 230, guided laser control circuit 24, time/digital quantizer 30, singlechip microcontroller 40, clock generator 50, the driving circuit of LCD liquid crystal display 60, JTAG emulation and debugging interface 90, and burning all is integrated on the pcb board with demarcation interface 95.Countdown circuit 130, reception control circuit 230, guided laser control circuit 24, time/digital quantizer 30, clock generator 50, LCD liquid crystal display 60, keyboard 70, supply unit 80, JTAG emulation and debugging interface 90, burning and demarcate interface 95 and all electrically connect with the respective pins of singlechip microcontroller 40, and these elements all connect supply power with supply unit 80.
LCD liquid crystal display 60 and keyboard 70 are installed in the outside surface of housing, and 82 on battery is installed in the battery case of housing.
Please continue to consult Fig. 4, Fig. 4 is the principle of work synoptic diagram of laser distance measuring system of the present invention.Thereby the ultimate principle of laser distance measuring system of the present invention is to reach the measuring distance purpose by the mistiming of detecting the reflector laser pulse signal that pulse signal that pulsed laser diode 150 launches and silicon PIN photodiode 250 receive, and the laser distance measuring system that shows on LCD liquid crystal display 60.There is a pulsed laser diode 150 and the silicon PIN photodiode 250 as laser pickoff as generating laser the laser distance measuring system front, they are by behind the guided laser localizing objects thing, the laser pulse signal that reflects to target emission laser pulse signal and receiving target; Calculate and calibrate out the mistiming of the two again by time/digital quantizer 30 and clock generator 50, calculate and revise out the actual distance of corresponding object and laser distance measuring system position then by singlechip microcontroller 40, on LCD liquid crystal display 60, show measurement result at last.
Below will be further combined with accompanying drawing, the concrete structure and the principle of work of laser distance measuring system is described in detail.
See also Fig. 5 a and Fig. 5 b, singlechip microcontroller 40 is sent transponder pulse signal (TX pulse) to countdown circuit 130, this countdown circuit 130 is equivalent to a gauge tap, make pulsed laser diode 150 conductings, the emission pulse laser signal sees through diversing lens 125 then and is transmitted on the object with tuftlet parallel laser impulse form.The laser that pulsed laser diode 150 is launched is the invisible light of 905nm wavelength, can not damage human eye.And the visible laser that guided laser transmitter 22 is launched is that (＜1mW) two level lasers (CLASS 2) then need human eye is protected for the micropower that meets the 650nm wavelength of EN60825-1:XXXX standard.
See also Fig. 6 a and Fig. 6 b, receiving optics comprises that focusing receiver lens 225, a slice that a slice has a high permeability to the 905nm wavelength laser place optical filter 226 between silicon PIN photodiode 250 and the receiver lens 225 and one to receive cavity.The pulsed laser signal of object reflected back sees through receiver lens 225, after filtration after mating plate 226 filtering, focus on the silicon PIN photodiode 250, be converted into pulsed current signal, delivering to amplifying circuit again amplifies, in current/voltage (I/V) change-over circuit, the pulsed current signal that amplifies is become pulse voltage signal then, at last in the shaping comparator circuit, the stable comparative level (Comp.level) that pulse voltage signal and singlechip microcontroller 40 are sent compares, export the received pulse signal (RX pulse) of square wave form again, and time of delivery (TOD)/digital quantizer 30.
Behind guided laser localizing objects thing, laser pulse signal is launched to object from stadimeter, then from the whole flight time TOF (time-of-flight) of object reflected back stadimeter, that is laser pulse signal transmits and receives detection, calculating and the calibration of mistiming and is to use international advanced special-purpose CMOS large scale integrated circuit (ASIC) " time/digital quantizer " TDC circuit to realize.
Please continue to consult Fig. 7, time/digital quantizer 30 is mainly used in detection, calculating and the calibration of mistiming, has higher integrated level and precision.The starting impulse signal that time/digital quantizer 30 is sent singlechip microcontroller 40 here (Start pulse) and penetrate pulse signal (TX pulse), the received pulse signal of sending here with reception control circuit 230 (RX pulse) carries out correlation computations, calculate the time difference of transponder pulse (TX pulse) and received pulse signal (RX pulse) time of arrival/digital quantizer 30, and then carry out time calibration with the calibration clock (Calclk) that clock generator 50 is sent here, obtain correct time difference (Δ TCAL), and give singlechip microcontroller 40 with the mode of parallel data and handle.
Time/digital quantizer 30 is TDC (TDC, Time-to-Digital Converter) pattern devices of high-precision usefulness gate array (Gate Array) technology realization cheaply.It has adopted 0.6 μ m CMOS process technique, can be operated in the wide power scope of 2.7V-5.5V, and packing forms is the encapsulation of LQFP440.8mm microspur.
When the 5V working power, this TDC circuit can reach the typical resolution of 45ps (psec).This is that traditional measuring element is inaccessiable.It combines repeatedly percussion and multi-channel function, when can carry out the mistiming and/or continuous coverage one by one.Train of impulses triggers measurement pattern (Burst Measurement Mode) and inner integrated arithmetical unit (ALU) makes its performance more perfect.
Inner integrated measurement rule is the technology of its use in addition, and this TDC device can carry out the split-second precision difference measurements under the low-power consumption situation, thereby it is used widely in battery powered application.
In a word, this time/digital quantizer 30 is well suited for the application of the measurement of time difference, such as, measure at laser distance, phase measurement, the implementation of system can successfully be finished in aspects such as localization by ultrasonic and temperature survey.
Singlechip microcontroller 40 control circuits are achieved as follows function:
1, receives the command signal that keyboard 70 buttons send, carry out function corresponding control and operation, coordinate the operation steps of other peripheral functional modules.
2, output control and data signal to electric power management circuit 84, controls supply voltage value and supply opportunity of other peripheral functional modules respectively; And receive the monitor signal that electric power management circuit 84 feeds back simultaneously, monitor, stable and the quality of assurance system each supply voltage when the state of measurement, and system's (standby when non-measurement state, sleep and off-mode) other peripheral functional modules is partly or entirely turn-offed in good time, to reach the power saving purpose.
3, output control and data signal to the liquid crystal display driver circuit, makes LCD liquid crystal display 60 show expectation measurement data and information, and with back lighting.
4, output enable signal (Laser enable) is given guided laser control circuit 24.The in good time opening/closing of control guided laser transmitter 22 is with location and the system's power saving purpose that reaches object.
5, output starting impulse signal (Start pulse) is given time/digital quantizer 30 circuit.Starting/notifying time/digital quantizer 30 is measured the beginning of state, and the zero-time reference point of measurement is provided.
6, output transponder pulse signal (TX pulse) is to radiating circuit 130 and time/digital quantizer 30 circuit.Driving pulse laser diode 150 sends the strong laser pulse of instantaneous power, and provides first timing pause TP (Stop A) pulse for time/digital quantizer 30.
7, output comparative level (COMP.level) is given receiving circuit 230.Make received pulse ripple (RXpulse) shaping sharpening become the very short square wave of rising edge as far as possible.
8, output vibration enable signal (Osc.enable) is given clock generator 50 circuit.The in good time opening/closing of control generator, with reach provide time calibration source and system's power saving purpose.
9, be connected with corresponding emulator with debugging interface 90 by JTAG emulation.Can carry out real-time online emulation and debugging to system, system software programming and hardware modifications are convenient.
10, by burning with demarcate interface 95, both can to the program of singlechip microcontroller 40 carry out repeatedly modification and the programming work of upgrading, also can carry out staking-out work to each laser distance measuring system individuality, be convenient to production.
11, the correct time difference DELTA TCAL that singlechip microcontroller 40 was sent here by 30 times of parallel port time of receipt (T of R)/digital quantizer, reject radiating circuit 130 and optical transmitting system are to Δ TTx time delay of transponder pulse signal (TX pulse), and receiving circuit 230 and receiving optics are to receiving Δ TRx time delay of pulse signal (RX pulse), and consider that entire circuit floats that (temperature is floated on time domain, electromagnetic interference (EMI) etc.) Δ T Δ, object reflectivity (aberration, material, bright and clean or roughness etc.) and the time difference Δ Tr that brought of ranging signal power, calculate from laser range finder and be transmitted into object, again from the whole laser pulse of object reflected back laser range finder at the actual contact flight time in space (The time-of-flight) Δ TTOF:
ΔTTOF＝ΔTCAL-(ΔTTx+ΔTRx)+(ΔTΔ+ΔTr) ①
(Δ T Δ and Δ Tr may be the plus or minus values),
By formula: d=ct/2c is the light velocity, t be the contact flight time 2.
Obtain the stroke d of laser pulse from the laser range finder to the object:
d＝cΔTTOF/2 ③
Then, revise laser flying circuit (light path, Light Path) stroke and laser distance measuring system difference DELTA d, obtain the actual distance D of object and laser range finder to the actual distance (vertical range or bee-line) of object:
D＝d-Δd ④
If the measuring basis limit of selection (laser range finder outward appearance forward position or edge, back) difference also will be considered laser distance measuring system outward appearance front and back size Δ h, then has
At last, give LCD liquid crystal display circuit corresponding data, show measuring distance by display screen.
12, singlechip microcontroller 40 also will be carried out the unit conversion of measuring distance, area/cubing and intermediate value storage, Time delay measurement, measuring basis limit (forward position/edge, back) selected, and maximum and minimum value are measured and storage, test constantly, measure indirectly, collude burst realization of law function, the realization of add-minus function, measurement group number (as 99 groups) storage, calling of last measured value (as 99 times) waits calculating and feature operation.
13, singlechip microcontroller 40 also will realize the conversion between systematic survey state (single, test constantly state) and the non-measurement state (standby, sleep and off-mode).
Such as the single measurement state time be 2S (time can change, down with) once, the test constantly state is that the 2S circulation is carried out; Holding state is 10S, and sleep state is 20S.System promptly enters off-mode surpass 20S under sleep state after, is triggered up to the button of starting shooting next time, and system enters holding state again.That is to say that laser distance measuring system is packed into behind the battery 82:
(1) click the start key, system reset, LCD liquid crystal display and backlight circuit work, flicker show current data and information (or last time measurement data and information), enter holding state (2).
(2) enter holding state after, in the 10S clock:
If any by measuring key, then enter measurement state (3);
If any pressing closing key, then enter off-mode (1);
If by other arbitrary function key except that " measuring key and closing key ", then keep holding state (2), 10S again clocks;
If, then do not enter sleep state (4) behind the 10S by any key.
(3) if the of short duration measurement key that clicks then enters the single measurement state, LCD shows measurement result behind the 2S clock, and measuring finishes enters holding state (2) again; Reaching 2S if pin the measurement key, then enter the test constantly state, is that circulation is measured with 2S, and promptly LCD shows that every 2S refreshes the one-shot measurement result, up to clicking the measurement key again, reenters holding state (2).Time delay measurement, area/cubing, maximum and minimum value measure, measure and collude burst law function and add-minus function indirectly also can be divided into single measurement and test constantly, just under holding state, click earlier and want the function key selected, of short durationly again click or pin (2S) and measure key, selection enters single measurement or test constantly, after calculating through corresponding selected function algorithm separately then, display result on LCD at last.
(4) enter sleep state after, the LCD LCD stops flicker and static data and the information that shows last measurement result, turns off LCD back lighting lamp, singlechip microcontroller 40 operates in the battery saving mode of low speed, in the 20S clock:
If any pressing closing key, then directly enter off-mode (1);
If, then enter holding state (2) again by other arbitrary button except that " closing key ";
If, then do not enter off-mode (1) automatically by any key.
(5) under any state except that " off-mode (1) " (promptly in any menu at any time) if any pressing closing key, then all can directly enter off-mode (1), and laser range finder is closed.
Under the measurement state, clock generator 50 circuit receive that the vibration that singlechip microcontroller 40 is sent here enables (Osc.enable) signal (low level is effective), start working, output calibration clock (Calclk) signal carries out the calibration of Measuring Time difference for time/digital quantizer 30 again.Vibrating under other state, to enable (Osc.enable) signal be high level, and clock generator 50 circuit quit work.
Comprise liquid crystal display drive circuit, LCD display, backlight drive circuit and backlight sheet/plate with LCD liquid crystal display 60 backlight and driving circuit thereof.
Under any state except that " off-mode ", LCD liquid crystal display 60 all can be opened the demonstration of carrying out data and information, and backlight then is under other state except that " off-mode and sleep state ", just can light the illumination of carrying out LCD display.
Keyboard 70 most basic configurations have start, shutdown, measurement, unit conversion and measuring basis limit options button; Also can expand increases some other function keys, measures, calls last measured value, colludes buttons such as a burst law function, add-minus function, memory function, removing and back lighting control as test constantly, range observation, area measurement, cubing, delay measurements, measurement indirectly, maximum and minimum value;
Some two or more buttons also reusable are a button, as start/shutdown or start/measurement or shutdown/removing or the conversion of plus-minus/unit or area/cubing selection or distance/area/cubing selection or the like composite-key.
Electric power management circuit 84 is made up of liter/voltage stabilizing and control circuit, radiating circuit HVB high voltage bias and control circuit, receiving circuit HVB high voltage bias and the control circuit three parts of primary power.
Under off-mode: all power supplys are supplied with and all can be disconnected, and reach power saving purpose to greatest extent;
Under sleep state: only give the power supply of singlechip microcontroller 40 and LCD display circuit, and for power saving, singlechip microcontroller 40 is operated in the battery saving mode of low speed;
Under holding state: show only for singlechip microcontroller 40 and LCD and the backlight circuit power supply, and singlechip microcontroller 40 is operated in the mode of operation of the higher speed that its peripheral hardware closes, total system power consumption at this moment is bigger.
Under the measurement state: the primary power of system's all functions module is all opened, transmit and receive circuit and all obtain high pressure, guided laser is lighted, and singlechip microcontroller 40 is operated in the mode of operation of high speed that its peripheral hardware is opened, it is maximum that the comprehensive operate as normal of total system, complete machine power consumption reach.
Battery 82, native system can adapt to: the power supply of No. 7 alkaline batteries of 4 * 1.5V LR03 (AAA), four joints, the perhaps power supply of one piece of square alkaline battery of 6F229V.
Under the measurement state, guided laser control circuit 24 receives that singlechip microcontroller 40 sends enables (Laser enable) signal, lights guided laser transmitter 22, emission visible laser directive object to be measured.Guided laser control circuit 24 can cut out guided laser transmitter 22 under other state, to reach the power saving purpose.
The visible guided laser wavelength that native system is selected is: 650nm (＜1Mw, CLASS 2).
The visible guided laser use standard of native system is: EN60825-1:03; EN60825-1:1994; EN60825-1:1993.
In system development and maintenance, system is connected with corresponding emulator with debugging interface 90 by JTAG emulation, can carry out real-time online emulation, debugging and trouble-shooting point to system.
In system development, can carry out the modification repeatedly and the programming work of upgrading to the program of singlechip microcontroller 40 by burning and demarcation interface 95.In laser testing instrument production,, can carry out staking-out work to each laser range finder individuality by demarcating interface.
This laser distance measuring system scheme characteristics are that optical system is succinct, the detection of mistiming, calculating and calibration are based on CMOS large scale integrated circuit " time/digital quantizer " the TDC circuit of high integration and realize, thereby the laser range finder machine product volume that achieves is little, cost is low, degree of accuracy is high, error is little, and good stability, reliability height, convenient reading are directly perceived.
Claims (12)
1. laser distance measuring system, it comprises transmitter module and receiver module, described transmitter module comprises by diversing lens and installs the optical transmitting system that the emission cavity of this diversing lens is formed, described receiver module comprises by receiver lens and installs the receiving optics that the reception cavity of this receiver lens is formed, it is characterized in that:
Described transmitter module further comprises generating laser, via optical transmitting system emission pulse laser signal;
Described receiver module further comprises laser pickoff, via receiving optics received pulse laser signal and be translated into pulse electrical signal;
Time/digital quantizer, the mistiming that is used to detect and calculate transponder pulse signal and received pulse signal;
Clock generator, output calibration clock signal is given time/digital quantizer; And
Singlechip microcontroller is controlled described transmitter module, receiver module, time/digital quantizer and clock generator, and calculates the actual distance of corresponding object and laser distance measuring system position according to the described mistiming.
2. laser distance measuring system according to claim 1 is characterized in that: the generating laser of described transmitter module is a pulsed laser diode.
3. laser distance measuring system according to claim 2 is characterized in that: the laser that described pulsed laser diode is launched is invisible light, can not damage human eye.
4. laser distance measuring system according to claim 1 and 2 is characterized in that: described transmitter module comprises that further a countdown circuit is in order to control described generating laser.
5. laser distance measuring system according to claim 1 is characterized in that: described laser pickoff is a silicon PIN photodiode.
6. laser distance measuring system according to claim 1 or 5, it is characterized in that: described receiver module comprises that further a reception control circuit is in order to control described laser pickoff.
7. laser distance measuring system according to claim 5 is characterized in that: described receiver module comprises that further one places the optical filter between silicon PIN photodiode and the receiver lens.
8. laser distance measuring system according to claim 1, it is characterized in that: described laser distance measuring system further comprises the guided laser module, it comprises that the guided laser transmitter is positioned object in order to launch a visible laser, and in order to control the guided laser control circuit of this guided laser transmitter.
9. laser distance measuring system according to claim 1 is characterized in that: described laser distance measuring system further comprises liquid crystal display, in order to show measurement parameter.
10. laser distance measuring system according to claim 1 is characterized in that: described laser distance measuring system further comprises a keyboard.
11. laser distance measuring system according to claim 1 is characterized in that: described laser distance measuring system further comprises a JTAG emulation and a debugging interface.
12. laser distance measuring system according to claim 1 is characterized in that: described laser distance measuring system further comprises a burning and demarcates interface.
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