发明名称 |
Ion concentration measuring apparatus |
摘要 |
An apparatus for measuring a concentration of a specific ion contained in a test liquid held in a container with the aid of a reference electrode and an ion sensitive field effect transistor having a gate portion selectively sensitive to the specific ion, including a series circuit of a reference resistor and a constant voltage supply source connected across drain and source of the ion sensitive field effect transistor, a potential control circuit having inputs connected across the reference resistor to detect a potential difference across the reference resistor for controlling a source or drain potential of the ion sensitive field effect transistor in such a manner that the potential difference remains at a predetermined value and a voltmeter for measuring the source or drain potential as a measure of the ion concentration.
|
申请公布号 |
US4641084(A) |
申请公布日期 |
1987.02.03 |
申请号 |
US19840677865 |
申请日期 |
1984.12.04 |
申请人 |
OLYMPUS OPTICAL CO., LTD. |
发明人 |
KOMATSU, SATSUKI |
分类号 |
G01N27/403;G01N27/414;(IPC1-7):G01N27/02;G01N27/26 |
主分类号 |
G01N27/403 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|