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Measurement device and measurement method

A technology for measuring devices and measuring objects, which is applied to measuring devices, material analysis through electromagnetic means, instruments, etc., can solve problems such as measuring device fluctuations, and achieve the effect of suppressing output fluctuations

Active Publication Date: 2019-12-03
LAPIS SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

like figure 1 As shown, in the measurement device equipped with ISFET, although the pH value of the measurement object is constant, the output of the measurement device fluctuates with time.

Method used

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  • Measurement device and measurement method
  • Measurement device and measurement method

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Experimental program
Comparison scheme
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no. 1 approach

[0039] figure 2 It is a cross-sectional view showing an example of the configuration of the measurement device 1 according to the embodiment of the present invention. The measurement device 1 has a function of outputting an electrical signal indicating the pH value of a measurement object.

[0040] The measuring device 1 has a reference electrode 20 accommodated inside the housing 10 . The reference electrode 20 is composed of a container 22 containing the internal liquid 21 , a junction 23 provided at the tip of the container 22 , and an internal electrode 24 partially immersed in the internal liquid 21 in the container 22 . As the internal liquid 21, for example, a potassium chloride (KCl) solution or a sodium chloride (NaCl) solution can be used. The junction 23 is made of, for example, porous glass. The internal liquid 21 accommodated in the container 22 seeps out from the junction 23 to the outside of the measurement device 1 . Internal electrode 24 is formed by cont...

no. 2 approach

[0060] Figure 9 It is a flowchart showing an example of the flow of the measurement process according to the second embodiment of the present invention executed in the control unit 41 .

[0061] In step S11 , the control unit 41 acquires a measurement interval for measuring the pH value of the measurement object 100 . The measurement interval corresponds to the period from the formation of the measurement state until the next formation of the measurement state. The measurement interval is described in the measurement program 407 , and the control unit 41 acquires the measurement interval by expanding the measurement program 407 in the main storage device 402 . In addition, the control part 41 may acquire the measurement interval input by user operation.

[0062] In step S12, the control unit 41 derives the length of the update period based on the measurement interval acquired in step S11. The control unit 41 derives the length of the update period so that the update period...

no. 3 approach

[0070] Figure 11 It is a diagram showing an example of the electrical configuration of the measurement device 1A according to the third embodiment of the present invention. The measurement device 1A varies the output voltage of the power supply 43 to thereby vary the reference voltage Vr applied to the reference electrode 20 . The level of the reference voltage Vr is controlled by a control signal Sc output from the control unit 41 .

[0071] Figure 12 It is a diagram showing an example of the hardware configuration of the control unit 41 according to the third embodiment of the present invention. A table 408 is stored in the auxiliary storage device 403 in addition to the measurement program 407 .

[0072] Figure 13 It is a figure which shows an example of the structure of the table 408. The table 408 is a database in which the level of the reference voltage Vr applied to the reference electrode 20 in the refresh state is associated with the length of the refresh peri...

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Abstract

The invention relates to a measurement device and a measurement method. The present disclosure provides a measurement device equipped with an ion-sensitive element that may suppress output variationscaused by drift. The measurement device including: an ion-sensitive element; a reference electrode disposed in a state in which a measurement subject is interposed between the reference electrode andthe ion-sensitive element; and a controller configured to: establish a first state at a predetermined interval, the first state being a state in which a current flows at the ion-sensitive element, andestablish a second state within each period after the first state has been established and before the first state is next established, the second state being a state in which a potential difference between the ion-sensitive element and the reference electrode is greater than a potential difference between the ion-sensitive element and the reference electrode in the first state.

Description

technical field [0001] The present invention relates to a measuring device and a measuring method provided with an ion sensing element. Background technique [0002] The following techniques are known as techniques related to measurement devices including ion sensing elements. For example, Patent Document 1 describes the following: a supporting substrate; a plurality of units that sense ions in the sample; a plurality of transistors that read and transfer signals corresponding to the amount of ions sensed by each unit; and analog / The digital conversion circuit converts the analog signal transferred from the transistor into a digital ion sensor. [0003] Also, Non-Patent Document 1 describes a technique for compensating drift in an ISFET (Ion Sensitive Field Effect Transistor: Ion Sensitive Field Effect Transistor), which is an ion sensing element. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2017-110978 [0005] Non-Patent Document 1: IEEE ELECTRON DEVICE LE...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/414G01N27/416
CPCG01N27/414G01N27/4165
Inventor 草野健一郎冈田敦彦佐野博明冲原将生
Owner LAPIS SEMICON CO LTD