| 摘要 |
Analysing fluid samples for target biological or chemical species comprising a detector unit with a body incorporating a SAW sensor ( 29 ) for said target species, in a microfluidic channel ( 27 ) and a reader unit adapted to receive the detector unit. The reader unit includes electrical contacts with said SAW sensor and a processor to analyse the sensor signals to determine if the target is present. The detector unit includes a storage reservoir ( 23 ) for the calibrating and sample solutions arranged so that the fluid flows through the microfluidic channel over the SAW sensor to a storage reservoir. The sensor is calibrated by using a first liquid having a known quantity of a form of the target species to provide a first frequency change and then a sample solution to be measured and measuring a second frequency change and using the first and second measurements to calibrate the sensor and determine the quantity of the target in the sample solution.
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