Rhodamine based sensors for applications in laser induced fluorescence thermometry were tested, and optimized. Laser Induced Fluorescence (LIF) is an optical non intrusive technique for temperature measurements. The technique uses a temperature sensitive dye, which is excited by a laser sheet providing spatial temperature diagnostic. The fluorescent dyes Rhodamine B and the Rhodamine 110, were used in combination with water. Thus in the present work the main findings regarding to the sensors: RhodamineB-water, RhodamineB-ink, RhodamineB/110-water, and RhodamineB/110-ink, are reported.