SU1198397A1 - Vibrating wire converter - Google Patents

Abstract

1. STRING CONVERTER containing a sensitive element with a string, an electromagnetic coil, a two-wire communication line, and. a system for recording and exciting vibrations of a string, which is also due to the fact that, for the purpose of increasing noise immunity, a separator, a limiter and an amplifier with a load, the output of which is connected to a two-wire link, are inserted into it, and an input through a limiter with an electromagnetic coil, with the separator connected in parallel to the limiter and the amplifier, the load is placed in the registrar system and the oscillation of the string. 2. The converter according to claim 1, which distinguishes with the fact that the separator is made in the form of at least two stabilization (L Tory).

Description

CO CX)

00 about

:

"S

Ҥ

 with

6

with

FIG. 1 1 The invention relates to a measurement technique, in particular, to a frequency frequency converter with pulse excitation, used in natural research of hydraulic weights, tunnels, bridges and other building structures. The purpose of the invention is to improve the noise immunity. FIG. Figure 1 shows a part of the structure diagram of a transducer embedded in the object under study; in fig. 2 is a converter block diagram. The string converter consists of an elastic sensing element 1 connected to the string 2, an electromagnetic coil 3, an excitation pulse separator and an informative signal, a limiter 5 and an amplifier 6. The converter 7 as a whole is inserted into the object under study using a two-wire communication line connected to a switch 8 excitation devices 9 for string oscillation and registration and control of communication with a computer 10. The load of amplifier R ' is transferred to the system for recording and exciting oscillations of a string. The principle of operation of the converter (Fig. O consists in the follower. When an excitation pulse is sent from the excitation device through the communication line to the converter, it arrives at the electromagnetic coil 3 through the separator 4 of the information signal request pulse. 972 In this case, the separator 4 passes only high voltage pulses excitation, but it is a great resistance for a constant voltage supply of the amplifier supplied through the communication line and does not pass the emf with an electromagnetically coil 3. An excitation pulse causes a string 2 to oscillate, and an emf of an informative signal, induced in electromagnetic coil 3, is fed through limiter 5 to the nipple 6. Limiter 5 is designed to protect amplifier 6 from the high-voltage impulse fed to electromagnetic coil 3. Amplified by amplifier 6 (Fig. 2), the informative signal is located on the load P, which is located in the recording and excitation system, and at the same time feeds the constant voltage U of the amplifier via the load Cc and the communication line. l converter. The advantage of the proposed string converter is that it expands its use area due to the high noise immunity of the transmitted informative signal, the converter and the secondary equipment can be separated through a communication line up to 3-4 km, the same for all sensors, the load improves metrological characteristics and measurement stability.

communication

ABOUT-

Claims (2)

1. A STRING CONVERTER containing a sensing element with a string, an electromagnetic coil, a two-wire communication line, and a system for recording and exciting vibrations of a string, characterized in that, in order to increase the noise immunity, a separator, limiter and amplifier with a load are introduced into it, the output of which is connected to a two-wire communication line, and the input is through a limiter with an electromagnetic coil, while the separator is connected in parallel with the limiter and amplifier, the load is placed in the registration and excitation system I am the vibrations of the string. 2. The converter according to claim 1, characterized in that the separator is made in the form of at least two counter-stabilizers.