SU489938A1 - Electro-optical range finder - Google Patents

Description

The invention relates to geodetic surveyors for measuring distance by electron-optical methods.

The electrical range finder is known, which contains a scale frequency geerator, a nol-conductor quantum emitter, a photomultiplier with an external control electrode, a control multivibrator, a synchronous detector, a null indicator, an optical delay line and a reflector.

For such a range finder, a long measurement program is typical, the state H1 is in a series of sequentially performed level setting operatives and phase locking of the signal first from the distance and then from the optical delay line.

To accelerate the measurement process in the proposed electro-optical range finder, two electrodes are installed at the end of the photomultiplier connected via a switch to the local oscillator, and the output of the photomultiplier connected to the level measurement circuit and through the second switch to one phase detector and a phase memory circuit to another input phase the detector.

The drawing shows a diagram of the electro-optical Dalpomera.

Scale-frequency generator 1 generates a high-frequency oscillation / m (on the order of 150 MHz), which is fed to a semiconductor 4-pin transmitter 2 and m6 1 1 its radiation. The modulated luminous flux of the transmitting object 3 is directed to the reflector 4. installed at the remote end of the measured line, n onto a smoothly continuous optical delay line 5. From the reflector, the light signal is focused by the object 6 into the aperture of the electrode 7, installed by the cathode of the photomultiplier 8. From the optical line, the light signal is directed at the aperture of the electrode 9, also installed in front of the photocathode. Both control electrodes, through switch III, alternately arrive at local oscillator 11 at a frequency / g. The switch is controlled by a symmetric multivibrator 12 at a frequency F (on the order of 100 Hz). As a result of the interaction of the modulated light fluxes with the voltage of the local oscillator at the control electrodes, a combination of the intermediate frequency L / / m - / g (about 10 KHz) alternates with the phases corresponding to the phases of modulation of the light fluxes in the photocurrent of the PMT. From the output of the PMT, signals are transmitted through the detector 13 to a synchronous detector 14 level with a null indicator 15 and through a switch 16 to a phase detector 17 with a null indicator 18. To store in time and compare the phases of both signals in one of the circuits, the phase memory circuit 19 is installed , for example, the constant delay line with m 1/2 / -. The switch 16 and the synchronous detector 14 are controlled in the same way as the switch 10, by a symmetric mull1) tuner 12.

The range finder works as follows.

After targeting the reflector to the null indicator 15 by a variable variable aperture 20, a zero count is set corresponding to the equality of the levels from the reflector and the optical delay line. If these levels are not equal, then the arrow of the null indicator is deflected to the right or left. Then, by changing the length of the optical delay line, a zero reading is set on the phase indicator 18. From the scale of the optical delay line, a phase difference reading is taken, expressed in a linear measure.

Subject invention

Electro-optical rangefinder containing; generator, local oscillator, emitter, two switches, timed delay line, photomultiplier tube cathode e on cylinder face, level measuring circuit, phase dropping circuit, phase detector with two inputs, indicator and reflector, distinguished by the fact that, in order to accelerate the measurement process, at the end of the photomultiplier tube there are two electrodes connected through a switch to the local oscillator, and the output of the photomultiplier tube is connected to the level measuring circuit and through the second switch to one input of the phase detector pa and after storing phase circuit to another input of the phase detector.