SU763694A1 - Remote phonometer - Google Patents

Description

the object and the background are maintained, and a light stream mixer from the object and the background is installed behind the modulator, with an additional amplifier connected to the receiver output, and a logical computing device is inserted between the outputs of the two amplifiers and the input of the recording device.

FIG. 1 is a schematic block diagram of a telephotometer; in fig. 2 is a section A-L in FIG. one.

The telephotometer consists of two input mirrors 1 and 2 for pointing at the object and background, two lenses .3 and 4, field diaphragms 5 and b, located in the foci of objects, two teams 7 and 8, mirror 9 for visual observation, modulator 10, the mixer 11, the light fluxes of the neutral and spectral filters 12 and 13, the radiation receiver 14. A preliminary force 15 is connected to the receiver output, the output of which is connected to the inputs of two amplifiers 16 and 17, the latter being provided with an analog key. With the output of the amplifiers, signals are fed to a logical computing device 18 for calculating the contrast, and the output of the logic device and the outputs of the amplifiers are connected to the input of the recording device 19. A source 20 of the reference radiation and a capacitor 21 are also installed in front of the modulator 22 and 23, directing radiation to the receiver 14.

The telephotometer works as follows.

Radiation from the object and the background with the help of mirrors 1 and 2 is directed to lenses 3 and 4. Field diaphragms 5. And b limiting the field of view of the object and background under consideration. The teams 7 and 8 project the entrance pupils of the lenses into the plane of the modulator 10. After the modulator, the light fluxes are combined into one using a mixer 11. The total flow, carrying information about the object's brightness, background and their difference in brightness, passes through the neutral and spectral filters 12 and 13 and is fed to the photocathode of the receiver 14. The signal from the output of the radiation receiver is fed to the preamplifier 15 and further to the inputs of two amplifiers 16 and 17. The selection and amplification of the signal proportional to the difference of the voltages is produced in the first amplification e 16 with a capacitive input. The selection and amplification of a signal, proportional to one of the frequencies, is carried out in a second amplifier 17 containing an analog switch. From the outputs of the amplifiers, signals are sent to a logical

a device 18 for calculating contrast. To eliminate the influence of the instability of the receiving-amplifier path on the measurement results, the luminous flux of the source 20 of the reference radiation is modulated by the modulator 10, collected by the condenser 21 and the mirrors 22 and 23 are directed to the receiver 14. The signals of the source 20 of the reference radiation from the receiver 14 output are fed to the preliminary the amplifier 15, from its output to the inputs of the amplifiers 16 and 17, the ac outputs of the latter to the logic device 18. The recording device 19 records signals proportional to the difference in the frequencies EKTA and background. The contrast is calculated in logic unit 10 by the formula

k - yb

K - g

where dB is the difference between the object's rcosts and

background;

 great brightness. This telephotometer allows, in comparison with a well-known telephotometer, to increase the accuracy of determining the brightness contrast between an object and the background due to simultaneous measurement of B and B, and to exclude the effect of a change in external conditions on the measurement results.

Claims (2)

1. USSR author's certificate number 126643, cl. G 01 J 1/04, 1960. 2.Patent of France S 1535737, cl. G 01 J 1/44, published 1968 (prototype). - at  (