Patent ID: 7307258

Claim:
A system for detecting the burn degree of skin, comprising: a laser source for generating laser light; a light-splitting device for splitting the laser light into a pump beam and a probe beam; a modulation device positioned on an optical path of the pump beam; a terahertz pulse emitter including a plurality of photoconductive antennas positioned in an array on a first surface of a substrate, the substrate having a lens disposed on a second surface of the substrate opposite the first surface, wherein the photoconductive antennas are irradiated by the pump beam so as to generate terahertz pulses emitted to burned skin; a first fiber coupler configured to transmit the pump beam from the modulation device to the photoconductive antennas of the terahertz pulse emitter via a plurality of fibers; at least one parabolic mirror configured to collect and focus the terahertz pulses on the burned skin; a terahertz pulse detector for detecting the terahertz pulses reflected by the burned skin, wherein the probe beam is coupled with the terahertz pulse detector; a current detector electrically connected to the terahertz pulse detector; a phase lock-in amplifier electrically connected to the current detector: and a second fiber coupler positioned between the light-splitting device and the terahertz pulse detector.