摘要： Light Detection and Ranging (LIDAR) is a remote-sensing technique based on collection of back scattered (optical frequency) electromagnetic radiation from a target point. The interaction of this radiation with surrounding gases and aerosol particles pave way for the measurement of various surrounding variables, including temperature, pressure, humidity and trace gases concentration. Although the LIDAR technique has been consistently used to measure various observables, the technique is typically limited to one specie at a time. However, this limitation can be mitigated using supercontinuum (SC) sources, which provides a broad spectrum [1] covering the absorption bands of all the investigated gases. Thus, opening the door for simultaneous detection of multiple species [2]. Herein, a new technique is developed for temperature mapping in thermal devices (TD), like combustion power plants, using a SC-based LIDAR. The device is design to measure temperature profile inside the TD using one opening. The technique is based on differential absorption, induced by the gas absorption cross section dependence on temperature, between three wavelength bands as shown in Fig. 1. (b). Water vapor transmittance, with a typical 10 % concentration and a 10 m interaction length, was modeled using the HITRAN 2012 database. Fig. 1. (a). depicts the schematic of the experimental setup. SC light pulses are guided into a furnace containing water vapor. Part of the incident light is scattered by the 1st scatterer placed just before the furnace, which will serve as a reference to the 2nd scatterer. The remaining part of the beam traverses through the furnace undergoing absorption, and subsequently being scattered by the 2nd scatterer behind the furnace. In an ideal combustion environment, the role of the scatterers is played by the naturally present aerosol particles. Moreover, the back-scattered signal from both scatterers are then detected as a function of time simultaneously for three wavelength bands. Therefore, by comparing the transmittance ratio between certain wavelength bands temperature profile within the thermal device can be determined. Our initial laboratory measurements shows a very close agreement with the simulation for all the channels (as shown in Fig. 1. (c)-(e)). Experimental data at elevated temperatures beyond 600°C were not obtained due to some technical limitations, which are currently being resolved. Nonetheless, our preliminary results demonstrates a temperature measurement accuracy of 15°C in the range from 400°C to 600°C and a spatial resolution of 30 cm. Besides temperature profiling, molecular number density or concentration can be measured simultaneously using the same technique, provided that three or more wavelength bands are used. Furthermore, by varying the direction of the incident beam in a non-parallel plane, a full 3D temperature and concentration measurements can be performed simultaneously using just one opening.