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Measuring device

A technology for measuring instruments and measuring objects, which is applied in the field of measuring instruments and can solve problems such as output saturation

Active Publication Date: 2019-01-11
SHIMADZU SEISAKUSHO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the conductivity of the sample solution flowing in the sensor unit 12 is very large, the current flowing between the two electrodes becomes very large, and subsequent circuits such as the multiplying unit 16 cannot cope with such an excessively large signal, and the output becomes low. saturation

Method used

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Embodiment Construction

[0037] Side reference Figure one Next, an embodiment of the measuring instrument of the present invention will be described. In the following embodiments, the conductivity detector used in the ion chromatograph is exemplified.

[0038] Image 6 It is a diagram showing the configuration of a conductivity detector according to an embodiment of the present invention. The conductivity detector 100 has an AC power supply 111, a sensor unit 112, a first amplification unit 129, a reference signal output unit 115, a multiplication unit 116, an A / D conversion unit 121, an accumulation unit 127, a second amplification unit 128, and a storage unit 162 , The output selection unit 163, and the control unit 170 that controls each component.

[0039] In the AC power supply 111, a voltage source that outputs a sinusoidal AC voltage of a predetermined amplitude and frequency is used. The sensor section 112 is composed of a pair of electrodes arranged to sandwich the flow path of the eluent from...

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Abstract

A measuring device (20) comprises: a sensor unit (12) that outputs an AC signal having an amplitude corresponding to a physical quantity of a measurement object; a reference signal output unit (15) that outputs a reference signal of which the frequency and the phase are the same as those of the AC signal; a multiplication unit 16 that multiplies the AC signal and the reference signal together; anA / D conversion unit (21) that is disposed before or after the multiplication unit (16); and an integration unit (37) that integrates digital signals outputted from the multiplication unit (16) for a prescribed time period. By use of the measuring device (20), the value of the physical quantity of the measurement object can be measured with a delay of only one cycle relative to the AC signal.

Description

Technical field [0001] The present invention relates to a measuring device that uses an AC signal to measure physical quantities, such as a conductivity detector used in a detector of an ion chromatograph. Background technique [0002] In ion chromatographs, a conductivity detector is often used as a detector for detecting each component (ion) of a sample separated by a chromatographic column. In the conductivity detector, a voltage is applied between a pair of electrodes, the current flowing between the two electrodes is measured, the conductivity of the eluent flowing between the two electrodes is calculated, and the components separated by the ion chromatograph are detected. The pair of electrodes are arranged to sandwich the flow path of the eluent (sample solution) from the ion chromatograph. Here, if the voltage applied between the two electrodes is a direct current, polarization is generated between the electrodes and accurate conductivity cannot be measured. Therefore, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/06
CPCG01N27/06G01N30/96G01N30/64G01N30/86G01N2030/645
Inventor 泽田秀人
Owner SHIMADZU SEISAKUSHO CO LTD