CN1112672A

CN1112672A - Laser distance measuring method

Info

Publication number: CN1112672A
Application number: CN 94106187
Authority: CN
Inventors: 黄肇基
Original assignee: FANGCHU Co Ltd
Current assignee: FANGCHU Co Ltd
Priority date: 1994-05-24
Filing date: 1994-05-24
Publication date: 1995-11-29

Abstract

The present invention relates to a laser distance-measuring method and its instreument, including laser transmitter, first reflecting mirror and second reflecting mirror. The first mirror is directed towards the transmitter at an elevation angle of 45 deg., and its surface is coated with 50% reflecting film, and when the laser is reached to the first mirror, 50% light is reflected upwards, and the reflected light-beam of the second mirror whose elevation angle is less than 45 deg. and surface is coated with 100% reflecting film on the measuring scale parallel to light-beam, and the reflected light-beams of the first and second mirrors are intersected in one point, and both light-beams and measuring scale are formed into a right triangle, and when regulating the elevation angle of the second mirror, the vertical side and horizontal side of said right triangle are changed in proportion, it is desirable that it is more than 22.5 deg., and when moving second mirror, the vertical side .....

Description

Laser distance measuring method

The present invention relates to a kind of laser distance measurement method, refer to a kind of long and short range observation that is applicable to especially, the distance-finding method that degree of accuracy is high.

Known use laser distance measuring method, shown in Figure 1A, launch laser in determinand body 4 surfaces by a laser beam transmitter 1, according to object the laser-bounce required time of returning is calculated its distance, that is, will be made as T reflection interval, the laser light velocity is made as C, then distance D between object and the laser beam transmitter=(T * C)/2 though this mode is simple, has following disadvantage:

1, when long distance ranging, laser beam power must be strengthened, otherwise can slacken poor accuracy because of the distance lengthening.

2, when short distance was found range, the time that reflects was too short, and not only dyscalculia, and degree of accuracy is not high.

3, if when the determinand body is non-high reflection object, reflecting effect is not good, influences its accuracy.

4, when the on-plane surface of determinand surface, reflection angle is variant, thereby influences its accuracy, if its difference angle is excessive, can not receive (shown in Fig. 1 C).

In view of aforementioned the 3rd shortcoming, have the people to install one additional on determinand body 4 surfaces and have the catoptron 41(of highly reflective shown in Figure 1B), though can solve aforementioned the 3rd shortcoming, yet all the other problems not only fail to solve, instead produce other disadvantage:

5, when the survey object distance is far, the gauger must hurry back and forth back and forth in

survey object

4 and 1 of laser beam transmitter, and is extremely inconvenient.

6, when the determinand surface is on-plane surface, its catoptron setting is difficulty very, if the improper reflection angle difference that then causes of device influences accuracy, if its difference angle is excessive, does not then receive (shown in Fig. 1 D).

Purpose of the present invention is to provide a kind of laser distance measurement method, is applicable to the measurement of long and short distance.

The object of the present invention is achieved like this, and a kind of laser distance measurement method promptly is provided, and the device that it uses comprises: a laser beam transmitter, emission visible laser beam; One first catoptron, it is 45 degree elevations angle inclinations towards the laser beam transmitter, and has 50% reflexive reflectance coating in this surface coated; One second catoptron is arranged on the rule parallel with aforementioned laser beam emissions direction, and it is one towards the laser beam transmitter and tilts less than the 45 degree elevations angle, and coating has 100% reflexive reflectance coating on this surface; When the laser beam transmitter sends laser beam on first mirror surface time, penetrable first catoptron of 50% laser, other 50% laser then is the upwards reflection of 90 degree, when aforementioned 50% laser beam by first catoptron is projected to second catoptron, can 100% reflection, and with aforementioned through first catoptron be 90 degree upwards 50% laser beams of reflection form an intersection point, two light beams and rule constitute a right angle triangle, when mobile second catoptron is on this rule, proportional between its vertical edges and horizontal sides, can be by its scale, i.e. horizontal sides length and learn vertical edges, measure need range finding from length.

The invention has the advantages that the laser distance measurement method that it provides, its mode of operation and used device are all very simple, low cost of manufacture, and degree of accuracy height, its laser beam must not have high-power, have on the industry to utilize to be worth.

Below in conjunction with accompanying drawing, embodiments of the invention are described, wherein:

Figure 1A～1D is an embodiment synoptic diagram of prior art;

Fig. 2 is one embodiment of the invention synoptic diagram;

Fig. 3 is the another embodiment of the present invention synoptic diagram;

Fig. 4 A, 4B are another embodiment of the present invention synoptic diagram.

See also Fig. 2, it is the embodiments of the invention synoptic diagram.

As shown in the figure, the invention provides a kind of laser distance measurement method, its used device comprises a laser beam transmitter 1, first catoptron 2, second catoptron 3, laser beam transmitter 1 can be launched visible laser beam, this first catoptron 2 is the 45 degree elevations angle towards laser beam transmitter 1 and tilts, and 50% reflexive reflectance coating 21 is arranged in this surface coated, when laser beam transmitter 1 sends laser beam on the reflectance coating 21 of first mirror surface time, penetrable first catoptron 1 of 50% laser, 50% laser then is the upwards reflection of 90 degree in addition, in addition, this second catoptron 3 is arranged on the rule 32 parallel with the laser beam transmit direction, it is one greater than 45 degree elevations angle inclinations towards laser beam transmitter 1, and has 100% reflexive reflectance coating 31 in this surface coated, when on the aforementioned reflectance coating 31 that is projected to second catoptron 3 by first catoptron, 50% laser beam, can 100% reflection, and be 90 degree through first catoptron and upwards reflect 50% laser beam and form an intersection point 5 with aforementioned, two light beams and rule 31 constitute a right angle triangle, as shown in Figure 3, move second catoptron 3 on rule 32 time, 52 of its vertical edges 51 and horizontal sides are proportional, so can be by its scale, be horizontal sides 52 length and learn vertical edges 51, promptly desire the distance of Measuring Object 4, the elevation angle of aforementioned second catoptron 3 is more preferably greater than 22.5 degree and less than 45 degree, so can form as Fig. 2, vertical edges 51 shown in 3 is greater than the situation of horizontal sides 52, be applicable to long range measurements, when if second catoptron, 3 elevations angle are spent greater than 45, then can form the situation of Fig. 4 A, can't be 90 degree through first catoptron and upwards reflect 50% laser beam and cross with aforementioned, and the elevation angle of second catoptron 3 is when spending less than 22.5, then can form the situation that is shorter than horizontal sides as vertical edges among Fig. 4 B, this situation is unsuitable for long range measurements.

Claims

1, a kind of laser distance measurement method is characterized in that the device that it uses comprises:

One laser beam transmitter, the emission visible laser beam;

One first catoptron, it is 45 degree elevations angle inclinations towards the laser beam transmitter, and has 50% reflexive reflectance coating in this surface coated;

One second catoptron is arranged on the rule parallel with aforementioned laser beam emissions direction, and it is one towards the laser beam transmitter and tilts less than the 45 degree elevations angle, and coating has 100% reflexive reflectance coating on this surface;

When the laser beam transmitter sends laser beam on first mirror surface time, penetrable first catoptron of 50% laser, other 50% laser then is the upwards reflection of 90 degree, when aforementioned 50% laser beam by first catoptron is projected to second catoptron, can 100% reflection, and with aforementioned through first catoptron be 90 degree upwards 50% laser beams of reflection form an intersection point, two light beams and rule constitute a right angle triangle, when mobile second catoptron is on this rule, proportional between its vertical edges and horizontal sides, can be by its scale, i.e. horizontal sides length and learn vertical edges, measure need range finding from length.

2, laser distance measurement method as claimed in claim 1 is characterized in that the second catoptron elevation angle is greater than 22.5 degree.