Ultra-broadband wavelength conversion sensor using thermochromic liquid crystals
2013
Wavelength conversion (WC) imaging is a methodology that employs temperature sensitive detectors to convert photoinduced
termperature into a detectable optical signal. One specific method is to use molecular detectors such as
thermochromic liquid crystals (TLC), which exhibits thermochromism to observe the surface temperature of an area by
observing the apparent color in the visible spectrum. Utilizing this methodology, an ultra-broadband room temperature
imaging system was envisioned and realized using off the shelf thermochromic liquid crystals. The thermochromic
properties of the sensor were characterized to show a thermochromic coefficient α = 10%/°K and a noise equivalent
power (NEP) of 64 μW. With the TLC camera, images of both pulsed and continuous wave (CW) sources spanning 0.6
μm to 150 μm wavelengths were captured to demonstrate its potential as a portable, low-cost, and ultra-broadband
imaging tool.
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