Circuit for eliminating amplitude temperature drift of Venturi oscillator

A technology of oscillator and Venturi, which is applied in the field of measurement signal source, can solve the problems of high production cost, complex circuit, compensation and elimination, etc., and achieve the effect of simple method, elimination of amplitude temperature drift and obvious effect

Active Publication Date: 2004-11-10
SHANGHAI YIDIAN SCI INSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can also solve the problem of temperature drift, the circuit is complicated, the production cost is high, and the compensation solution cannot be completely eliminated.

Method used

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  • Circuit for eliminating amplitude temperature drift of Venturi oscillator
  • Circuit for eliminating amplitude temperature drift of Venturi oscillator
  • Circuit for eliminating amplitude temperature drift of Venturi oscillator

Examples

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Embodiment Construction

[0009] like figure 2 As shown, a circuit that eliminates the temperature drift of the Wien oscillator amplitude. It is composed of a Venturi oscillator 1, an operational amplifier circuit A, a first detection circuit 2, an analog-to-digital converter A / D, and a second detection circuit 3; the input terminal of the second detection circuit 3 is connected to the Venturi oscillator 1 Output V 1 Connected, its output is connected to the reference voltage input terminal V of the analog-to-digital converter A / D R connection; where the Wien Oscillator 1 output V 1 , The input terminal of the operational amplifier circuit A is respectively connected with the measured equivalent resistance R X Both ends are connected. In the above circuits, the second detection circuit 3 and the first detection circuit 2 must be the same circuit.

[0010] According to the principle of the op amp circuit:

[0011] V 2 = ...

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PUM

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Abstract

The invention provides a circuit to eliminate Venturi oscillator amplitude drift, composed of Venturi oscillator, operational amplifier circuit, first detector circuit, A/D converter and also second detector circuit. Where the second detector circuit's input end is connected with the Venturi oscillator's output end, and the second detector circuit's output end connected with the A/D converter's reference voltage input end; the Venturi oscillator's output end and the operational amplifier circuit's input end are connected with two ends of the equivalent resistor, respectively; the two detector circuits are the same circuit. The reference voltage and the measured voltage will drift in the same proportion, thus able to eliminate the temperature drift of amplitude, and the measured result can not be influenced by temperature variation, basically. It has advantages of simple method and outstanding effect.

Description

technical field [0001] The invention relates to a measurement signal source, in particular to a circuit for eliminating the amplitude temperature drift of a Wien oscillator. Background technique [0002] Conductivity represents the ability of a substance to conduct electricity, as opposed to resistance. Conducting electricity can be either electrons or ions in solution. In general, the conductivity of a solution reflects the number of ions in it. For example, when measuring the quality of pure water, conductivity (or resistance value) can be used to indicate the purity of pure water. The smaller the conductivity (or the larger the resistance value), the fewer conductive ions in the water and the purer the water. A conductivity meter is an instrument for measuring the conductivity of a solution. Insert two metal pole pieces (i.e. electrodes) into the solution, apply a voltage to both ends, and a current will be generated between the two pole pieces. Only need to measure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04
Inventor 宋翔鹰顾敏杰
Owner SHANGHAI YIDIAN SCI INSTR
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