M190 Application [μL Liquid Senser]

 
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Made on a Mac
Measure Water Drop
Measure Floating Capacitance

Floating “C” cancellation and Measurement “C” component by Copper

Actual ＆ Possible Products

Used in Blood Inspection System as

the tool for accurate “Pick up Blood and Drop in several Reagents” !


Actually TOSHIBA Medical

(now change to CANON Medical) used this μL measurement circuit.

[Medical Application]

μL Liquid Senser

How we can measure the “C” by copper plate


     The “C” measurement is familiar one, but the change is

     so small and measure it accurately in case it is so tough

     that need new unique circuit idea to achieve extraordinary

     Gain and big CMRR.


     The solution point is “How to make huge Gain Amplifier

     with high CMRR !?”


     I could make it with cancellation method of the Common

     Floating “C” effectively !


     That is able to do with M190 Amplifier.


M190 Amp.

How we can measure the “C” of Water Drop !

The “C” by copper plates on the same board The measurement of “C”s on the same board is the same results could get ! But cable to the sense point have to be fixed to make sure the stable measurements !

Micro Pipet design note:

With metal tube can measure right “C” of the liquid in the pipet !  If replaceable plastic tube, need the sense cable touch to the liquid ! 

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