Title:
共振ケミカルセンサ用の固有雑音低減を伴った高周波測定回路
Document Type and Number:
Japanese Patent JP4476496
Kind Code:
B2
Abstract:
The concentration of an analyte in a fluid is measured by a quartz crystal microbalance sensor device in the fluid containing a concentration of the analyte. The sensor device exhibits a resonant frequency representative of the concentration of the analyte in the fluid. A quartz crystal microbalance reference device has a resonant frequency lower, by a predetermined amount, than the initial resonant frequency of the sensor device before the sensor device is exposed to the analyte. A signal is derived based on the difference of the resonant frequencies of the sensor and the reference device, and a first counter counts a predetermined number of cycles of the difference signal frequency to derive a sample time period. A second counter counts cycles of a clock signal frequency during the sample time period to derive a count representative of the difference signal frequency.
Inventors:
Diruger, Jiyoung Pee.
Application Number:
JP2000616413A
Publication Date:
June 09, 2010
Filing Date:
April 26, 2000
Export Citation:
Assignee:
Fisher Controls International Limited Liability Company
International Classes:
G01G3/13; G01N5/02; G01N27/00; G01N29/02
Domestic Patent References:
| JP62288547A | ||||
| JP6241972A | ||||
| JP4034334A | ||||
| JP9304259A | ||||
| JP2206742A | ||||
| JP6167435A |
Attorney, Agent or Firm:
Yoshihiro Tsunoda