Multi-channel, fiber-coupled diode laser sensor for harsh environments [temperature and chemical sensor]

We developed a new temperature and chemical sensor primarily for high temperature gas combustion measurement and process control applications. Our sensor is based on line-of-sight infrared spectroscopy. The use of fiber optics to couple the sensor to the probe region offers additional flexibility and utility. Our device is non-intrusive thus there are none of the time lag, maintenance, lifetime, and calibration problems associated with intrusive or extractive sampling probes. Our sensor is a real-time sensor and generates measurements on millisecond time scales. Using a single laser diode through a fiber optic network, the sensor is capable of making measurements at multiple locations simultaneously. Judicious choice of probe wavelength eliminates the need for beam isolation and purging strategies to minimize sensitivity to ambient water vapor. By using proven telecom hardware and photonics technology, the sensor is inherently reliable and affordable.