Before revision: 338 where V = Votage ω = angular frequency of the modulated incident P = pyroelectric coefficient L = film thickness ε = film dielectric constant A = area of film r = resistance of the film C = capacitance of the film τE = electrical time constant of the detector outpu
After revision: 338 where V = Voltage ω = angular frequency of the modulated incident P = pyroelectric coefficient L = film thickness ε = film dielectric constant A = area of film r = resistance of the film C = capacitance of the film τE = electrical time constant of the detector outpu