Sensitivity video sensors

Because the spatial area with higher temperature on the catalyst surface of one of the samples of the library is very small the detection of catalytic activities through temperature measurement cannot be carried out by direct temperature measurements but only by non-contact methods such as pyrometry or IRT. The IR video camera used here measures the emission at every point of the library in parallel. The detector consists of a 256x256 pixel array of Pt-silicide-IR-sensors. Each pixel delivers a voltage-signal that depends on the infrared radiation and the sensitivity of that pixel (fixed pattern noise). 

Pyrometry is thought to be the most feasible method to extract quantitative information from radiation spontaneously emitted from flames. Temperature distributions over large regions of the flame can be derived by applying the Plank law to every pixel of a CCD sensor. Two-color techniques are usually applied, due to its reduced sensitivity to uncertainties in emissivity or attenuation. Infrared cameras are used in most cases, as radiation levels are highest in this region of the spectrum [4-7]. Two channels of RGB video cameras have been also used in some works [8] although less accurate, this has the... 

The environment in which the sport is taking place can also pose some constraints for example, the development of sensors for wet sports, impact sports or sports taking place in extreme temperature requires additional consideration for the system s robustness and stability. Further, local temperature, humidity and pH levels also change during physical exercise and can affect some sensors. For example, Cochrane et al. (2007) demonstrated how the electrical performance of their sensor material, a thermoplastic elastomer composite, was affected by high humidity. After 50% relative humidity, resistance increases rapidly with humidity. They attributed it to the carbon black nanoparticles of the composite, which are sensitive to water. At high humidity, temperature also had a small effect on resistance. Munro et al. (2008) also found that while their strain sensors were able to provide valid and reliable data compared to a video-based motion analysis system, the consistency of the feedback was affected by enviromnental conditions. 

---