JPH05312953A - Optical ranging system - Google Patents

Abstract

PURPOSE:To perform real time ranging of a plurality of points easily and continuously without moving a corner cube reflector. CONSTITUTION:Optical transmitters 3-5 convert electric signals, received from a signal generator 1 through a switch 2, into optical signals having different wavelengths. Light from the optical transmitters 3-5 is transmitted through optical fibers 6 to a projecting lens 7 and projected therefrom. Optical bandpass filters 8-10 pass the light transmitted from corresponding optical transmitters 3-5 selectively and irradiate corner cube reflectors 11-13. An optical receiver 15 converts the light condensed through a light receiving lens 14 and reflected on the corner cube reflectors 11-13 into an electric signal. A phase difference measuring unit 16 measures phase difference between the electric signal converted through the optical receiver 15 and an electric signal outputted from the signal generator 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lightwave distance measuring system, and more particularly to a lightwave distance measuring device using a corner cube reflector as a reflecting mirror.

[0002]

2. Description of the Related Art Conventionally, in this type of optical distance measuring device,
As shown in FIG. 2, the electric signal output from the signal generator 1 is converted into an optical signal by the optical transmitter 17, and the light is emitted from the light projecting lens 7 toward the corner cube reflector 11. Since the corner cube reflector 11 reflects the incident light in the same direction as the incident direction, the light emitted from the light projecting lens 7 is reflected by the corner cube reflector 11 and returns.

The light reflected by the corner cube reflector 11 and returned is condensed by the light receiving lens 14 and converted into an electric signal by the optical receiver 15. The phase difference measuring device 16 measures the phase difference between the signal converted and output by the optical receiver 15 and the electric signal output from the signal generator 1. The light wave distance measuring device obtains the distance to the corner cube reflector 11 from the phase difference measured by the phase difference measuring device 16.

In such a conventional light wave distance measuring device, when measuring distances at a plurality of points, the light emitted from the light projecting lens 7 is moved by moving the corner cube reflector 11 to each of the plurality of measurement points. There is a problem that it is necessary to perform an aiming operation so as to hit 11 and distances at a plurality of points cannot be continuously measured in real time.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to eliminate the above-mentioned problems of the conventional ones, and it is possible to easily measure the distances at a plurality of points continuously in real time without moving the corner cube reflector. The purpose of the present invention is to provide a lightwave distance measurement system that can be performed by

[0006]

The lightwave distance measuring system according to the present invention is characterized in that the distance measurement light emitted from the lightwave distance measuring device to the distance measurement object and the phase difference between the reflected light from the distance measurement object with respect to the distance measurement light A lightwave distance measuring system for measuring a distance to a distance measurement target, wherein the lightwave means comprises a plurality of light emitting means for emitting distance measuring light having different wavelengths and a means for selectively emitting the plurality of light emitting means. The distance measuring device is provided with reflecting means for selectively transmitting and reflecting only the distance measuring light having a predetermined wavelength among the distance measuring light emitted from the plurality of light emitting means. It is characterized by

[0007]

An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the electric signal output from the signal generator 1 is guided to any one of the optical transmitters 3 to 5 by the switching operation of the switch 2. The electrical signals input from the signal generator 1 to the optical transmitters 3-5 via the switch 2 are converted into optical signals of different wavelengths by the optical transmitters 3-5. The light emitted by any one of the optical transmitters 3 to 5 is guided to the light projecting lens 7 by the optical fiber 6, and the corner cube reflectors 11 to 11 installed from the light projecting lens 7 to the distance measuring point.
It is emitted toward 13.

Optical band pass filters 8 to 10 are attached to the front surfaces of the corner cube reflectors 11 to 13, respectively. The optical bandpass filter 8 selectively transmits only the light emitted by the optical transmitter 3.
Further, the optical bandpass filter 9 selectively transmits only the light emitted by the optical transmitter 4. Further, the optical bandpass filter 10 selectively transmits only the light emitted by the optical transmitter 5.

That is, when the light emitted from the optical transmitter 3 is emitted from the light projecting lens 7, the light passes through the optical bandpass filter 8 and the corner cube reflector 1
Reflect at 1. When the light emitted from the optical transmitter 4 is emitted from the light projecting lens 7, the light passes through the optical bandpass filter 9 and the corner cube reflector 1 is transmitted.
Reflect at 2. Further, when the light emitted from the optical transmitter 5 is emitted from the light projecting lens 7, the light passes through the optical bandpass filter 10 and is reflected by the corner cube reflector 13.

The light reflected by the corner cube reflectors 11 to 13 is received by the light receiving lens 14 to the optical receiver 15.
The light is collected by the optical receiver 15, converted into an electric signal by the optical receiver 15, and then output to the phase difference measuring device 16. The phase difference measuring device 16 measures the phase difference between the signal converted by the optical receiver 15 into an electric signal and output, and the electric signal output from the signal generator 1. From the phase difference obtained by the phase difference measuring device 16, the distance to the corner cube reflectors 11 to 13 is obtained.

That is, by guiding the electric signal from the signal generator 1 to the optical transmitter 3 by the switch 2, the distance to the corner cube reflector 11 can be measured. Further, by guiding the electric signal from the signal generator 1 to the optical transmitter 4 by the switch 2, the distance to the corner cube reflector 12 can be measured. Furthermore, by guiding the electric signal from the signal generator 1 to the optical transmitter 5 by the switch 2, the distance to the corner cube reflector 13 can be measured.

As described above, the light emission from the optical transmitters 3 to 5, which emit light of different wavelengths, is selectively performed by the switching device 2, and the corner cube reflectors 11 to 11 are made.
The optical bandpass filters 8 to 10 provided on the front surface of the optical fiber 13 selectively transmit only the light of the wavelengths previously assigned among the lights from the optical transmitters 3 to 5,
It is possible to easily measure distances at a plurality of locations without moving the corner cube reflectors 11 to 13.
In addition, by switching the optical transmitters 3 to 5 at high speed by the switch 2, it is possible to continuously measure the distances at a plurality of points in real time.

[0014]

As described above, according to the present invention, a plurality of light emitting means for emitting distance measuring light having different wavelengths are selectively emitted, and the distance measuring light emitted from the plurality of light emitting means is emitted. By selectively transmitting and reflecting only the distance measuring light of each of the pre-assigned wavelengths among them, it is possible to easily and in real time continuously measure distances at a plurality of points without moving the corner cube reflector. The effect is that it can be done.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a conventional example.

[Explanation of symbols]

 1 Signal Generator 2 Switching Device 3-5 Optical Transmitter 6 Optical Fiber 7 Projection Lens 8-10 Optical Bandpass Filter 11-13 Corner Cube Reflector 14 Receiving Lens 15 Optical Receiver 16 Phase Difference Measuring Device

Claims (2)

[Claims] 1. The distance to the distance measuring object is measured from the phase difference between the distance measuring light emitted from the light wave distance measuring device to the distance measuring object and the reflected light from the distance measuring object with respect to the distance measuring light. In the optical distance measuring system, a plurality of light emitting means for emitting distance measuring light having different wavelengths and a means for selectively emitting the plurality of light emitting means are provided in the optical distance measuring device, and the plurality of light emitting means are provided. A lightwave distance measuring system, characterized in that the distance measuring object is provided with a reflecting means for selectively transmitting and reflecting only distance measuring light of a wavelength assigned in advance among the distance measuring light emitted from the light emitting means. . 2. The optical distance measuring system according to claim 1, wherein the distance measuring light and the reflected light are each converted into an electric signal to detect a phase difference.