| 摘要 |
<p>The system comprises a chemical sensor package having a pair of temperature sensitive chemical sensors in a common temperature environment, a fluid containing an analyte chemical to be measured flowing across one of the sensors as a test sensor, the other sensor being a reference sensor isolated from the fluid flow, each sensor providing a frequency signal as an output; device for determining a difference in frequency between the outputs of the sensors, the difference in frequency being a measure of the amount of the analyte chemical in the fluid; device for heating the common temperature environment in response to a control signal and device for generating the control signal as a function of the frequency signal from the reference sensor to maintain the temperature of the sensors at a desired steady state value. The generating device comprises device for determining a frequency value for the frequency signal from the reference sensor, the frequency value being a function of temperature; and device for converting the frequency value into the control signal.</p> |
