RU1803737C - Contactless photoelectric vibroprobe - Google Patents

Abstract

Usage: the invention relates to measuring technique and can be used to study the parameters of spatial vibrations of various objects. SUBSTANCE: the invention implements a compensation method for suppressing an interfering signal depending on tremor of the operator's hand. A compensating signal is generated in a special channel that captures the tremor with respect to a stationary object. Registration of the measured parameters is carried out at the moment of optimal location of the end of the vibration probe relative to the surface of the object under study. In the vibration probe, the compensation channel is calibrated relative to the measuring channel, carried out before the start of the measurement cycle, 1: ill.

Description

The invention relates to measuring technique and can be used to study the parameters of mechanical vibrations of various objects.

The purpose of the invention is to expand the frequency and dynamic range of a non-contact photoelectric vibrometer.

Structural diagram of the proposed device is shown in the drawing.

The non-contact photoelectric vibration probe comprises a first fiber optic transducer (1) for fixing the parameters of the studied oscillation and converting them into an electrical signal; the first and second blocks for extracting constant and variable components (2.10) for separating information and non-information components of an electrical signal; key (3) for transmitting the measured

signal to the recording unit (8) at optimal time points; a comparator (4) for generating signals corresponding to the optimal moments of registration of the measured signal; a pulse shaper (5) for setting a signal recording interval; a reference voltage source (6) for defining a boundary of a working area of a vibration probe conversion function; indicator (7) for operator information: about the optimal moment of measurement; a second fiber optic converter (9) for fixing the tremor of the operator’s hand relative to the stationary object and generating the corresponding electrical signal; automatic gain control unit (11) for changing the gain of the normalizing amplifier (12) in proportion to the distance 00

with xi with

Xi

a line from a second fiber optic converter to a fixed object; an inverter (13) for generating an inverse signal corresponding to tremor of the operator’s hand: an adder (14) is designed to combine the measuring and compensation channels.

Formula Non-contact photoelectric vibration probe containing a fiber optic transducer, serially connected first block of constant and variable component extraction, comparator, pulse shaper, key and recording unit, source reference voltage, the output of which is connected to the second input of the comparator, an indicator, the input of which is connected to the second output of the comparator, the input of the first constant and variable component extraction unit is connected to the output of the fiber optic

converter, characterized in that, in order to expand the frequency and dynamic ranges, it is equipped with an additional fiber-optic converter, connected in series with a second constant and variable component extraction unit, a normalizing amplifier, an inverter and an adder, an automatic gain control unit, the output of which is connected with the second output of the second block of allocation of constant and variable components, the output is with the second input of the normalizing amplifier, the second input of the adder is connected to W output of the first isolation ring unit constant and variable components, the output - to the second input key, yield additional fiber optic transducer connected to the input of a second separating unit constant and variable components.