RU95103233A - Device for determining the chemical composition and structure of substance - Google Patents

Abstract

FIELD: measuring equipment, in particular, devices for determining the chemical composition and structure of substances by nondestructive testing; can be used in various fields of science, technics and national economy. SUBSTANCE: the value of tunnel current is measured the gap between the specimen under test and sensor in an alternating radio-frequency field at a strength of (10-10) V/m with a subsequent processing of the measurement results. The device uses a controlled electric pulse generator, two end-face capacitance transducers, series-connected comparison unit, current- to-voltage converter, frequency compensation unit, amplifier and a low-pass filter, whose output is connected to a resolver and digital voltmeter, as well as a code-to-resistance converter, whose output is connected to the second input of the compensation unit. The sensors are cut in between the respective inputs of the comparison unit and first output of the controlled electric pulse generator whose second output is connected to the input of the code-to-resistance converter. One of the sensors is made for positioning of electrodes with a gap on the surface of the substance under test. Varying the pulse repetition frequency of the controlled electric pulse generator, the mean value of tunnel current is being measured, and, according to the results of measurements, the quantity of free electrons and the level of ionization of the substance under test are determined, which makes it possible to determine the substance proper, and at an analysis of multicomponent substances - not only the composition, but also the quantitative value of revealed components. EFFECT: enhanced functional abilities. 4 dwg

Claims (1)

The invention relates to instrumentation, in particular to devices for determining the chemical composition and structure of a substance by non-destructive testing, and can be used in various fields of science, technology and national economy. The essence of the proposal is to measure the magnitude of the tunneling current in the gap between the controlled sample and the sensor in an alternating high-frequency field of intensity 10 ⁶ - 10 ⁷ V / m, followed by processing of the measurement results. The device comprises a controlled electric current pulse generator, two sensors in the form of an end-type capacitance, series-connected comparison unit, a current / voltage converter, a frequency correction unit, an amplifier and a low-pass filter, the output of which is connected to a resolving device and a digital voltmeter, and a code / resistance converter, connected to the second input of the correction block by an output. In this case, the sensors are connected between the corresponding inputs of the comparison unit and the first output of the controlled pulse generator of the electric current, the second output of which is connected to the input of the code / resistance converter. One of the sensors is arranged to place electrodes on the surface of the controlled substance with a gap. Changing the pulse repetition rate of a controlled electric current pulse generator, the average value of the tunneling current is measured and the number of free electrons and the level of ionization of the controlled substance are determined from the measurement results, which makes it possible to determine the substance itself, and when analyzing multicomponent substances, not only the composition, but also the quantitative value of the detected components .