A sine-modulated high-intensity UV-LED light source for pressure-sensitive paint applications using fluorescence lifetime imaging technique

Abstract

A sine-modulated high-intensity UV-LED light source for pressure-sensitive paint applications using fluorescence lifetime imaging technique,"

Investigation of Image-based Lifetime PSP Measurements with Sinusoidal Excitation Light

“…It is important for the FLIM-PSP technique to use a reliable and stable sinusoidal excitation light [4]. In this work, the excitation light intensity with sinusoidal modulation is generated by a HARDsoft UV-LED [5], which was modified for our purpose. Figure 4 shows an oscillogram of input signals to the LED and an emitted light from LED.…”

“…This LED can be operated with a sinusoidal input signal of 1 Vpp generated by the pco.flim camera and a gate input (TTL signal from pco.flim) for switching the generated light on and off. Detailed features of the modulation light source are introduced in the Ref [5].…”

“…Oscillogram of TTL gate input signal (yellow), sine modulation input signal (magenta) and measured light flux (cyan). LED current 10 A max and offset 0.53 V[5].…”