Circuit for eliminating amplitude temperature drift of Venturi oscillator

An oscillator and Venturi technology, applied in the field of measuring signal sources, can solve the problems of insufficient compensation, complex circuits, and high production costs, and achieve the effect of eliminating amplitude temperature drift, obvious effect, and simple method

Active Publication Date: 2007-09-19
SHANGHAI YIDIAN SCI INSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Experimental program
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Effect test

Embodiment Construction

[0009] As shown in Figure 2, a circuit that eliminates the influence of the temperature drift of the Wien oscillator amplitude on the measurement. Including 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; wherein the input terminal of the second detection circuit 3 is connected to the output of the Venturi oscillator 1 terminal connection, and its output terminal is connected to the reference voltage input terminal V of the analog-to-digital converter A / D R Connect; wherein the input end of the first detection circuit 2 is connected with the output end of the operational amplifier circuit A, and its output end is connected with the voltage input end V of the analog-to-digital converter A / D in Connection; where the output of the Wien oscillator 1 and the input of the operational amplifier circuit A are respectively connected to the measured equivalent resistance R X B...

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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 influence of the amplitude temperature drift of a Wien oscillator on measurement. 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...

Claims

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Application Information

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