The applications of thermochromic compounds (cobalt chloride, 3,5-dinitro s
alicylic acid) for fibre optic temperature sensors are presented. The senso
rs are based on thermochromic layers which utilise solution or polymeric fo
il made of polyHEMA. Spectral properties of the compounds were determined i
n an array spectrophotometer in order to choose an appropriate analytical w
avelength of the sensor. Light emitting diodes (LED) were used as light sou
rces in fibre optic sensors. (C) 1999 Elsevier Science S.A. All rights rese
rved.