A novel compact dual-wavelength measurement system for absorbance chemical sensing incorporating digital lock-in amplifiers is reported. Its main innovation is the introduction of a reference wavelength to correct the possible non-specific optical changes of the system. The performance of the instrumentation has been tested on a laboratory setup and with integrated optical absorbance sensors. © 2007 IOP Publishing Ltd.
|Journal||Measurement Science and Technology|
|Publication status||Published - 1 Nov 2007|
- Absorbance measurement
- Digital signal processor
- Dual-wavelength measurement
- Lock-in amplification