Digital logarithm taker in devices for measuring optical density

Translated from Izmeritel'naya Tekhnika, No. 7, pp. 29–30, July, 1989.     

Digital shaft angular velocity measuring meter

Translated from Izmeritel'naya Tekhnika, No. 2, pp. 43–44, February, 1992.     

Phase meter for measuring displacements

Translated from Izmeritel'naya Tekhnika, No. 2, pp. 19–20, February, 1988.     

Digital error-signal extraction technique for real-time automatic control of optical interferometers

We describe an efficient and robust method for the extraction of the longitudinal error signal for the automatic control of optical interferometers, which can also be applied when the uncontrolled optical system spans hundreds of fringes. The method is based on classic modulation techniques (phase modulation, mechanical modulation, etc.), but extends their performances by the use of the information available only at the output photodiode. We digitally implemented such a method by following modular hardware and software architectures. We then tested the whole procedure in the automatic control of a suspended Michelson interferometer, showing its feasibility and the good performances.     

Digital kilovoltmeter for x-ray machines

Translated from Izmertitel'naya Tekhnika, No. 4, pp. 59–60, April, 1992.     

An automatic alignment system for measuring optical path of transmissometer based on light beam scanning

This paper proposes a novel alignment system based on the measurement of optical path using a light beam scanning mode in a transmissometer. The system controls both the probe beam and the receiving field of view while scanning in two vertical directions. The system then calculates the azimuth angle of the transmitter and the receiver to determine the precise alignment of the optical path. Experiments show that this method can determine the alignment angles in less than 10 min with errors smaller than 66 μrad in the azimuth. This system also features high collimation precision, process automation and simple installation.     

Universal coders for automatic measuring systems

Conclusions The above block schematics of universal multichannel coding functional converters can be used for making up automatic digital measuring systems. By means of these converters the measuring systems acquire computing characteristics which provide an evaluation and correction of errors due, for instance, to the nonlinearity of continuous information transducers. Moreover, the functional coding operation considerably widens the application of measuring equipment with a digital output by extending it to indirect measurements. It should be noted that the solution of a similar problem of functional coding by combining linear coding converters with electronic functional converters of a continuous type (for instance, diode functional converters) leads to more cumbersome, less reliable devices whose coding accuracy is inferior to that of the functional devices described in this article. Moreover, in using functional converters of a continuous type it is difficult to provide multiconditional coding operations. Translated from Izmeritel'naya Tekhnika, No. 11, pp. 30–35, November, 1961