Nonlinearity in the response of a thin-wire bolometer to periodic laser pulses

Abstract

The normalized response coefficient for detection of the instantaneous power of a periodic train laser pulses by a thin-wire bolometer has been obtained. The duration of the pulses is significantly less than the pulse interval period which is comparable to the thermal time constant which, in turn, is dependent on the incident thermal energy and its non-uniform distribution. A linear temperature dependence has been noted for the coefficient of resistance, the absorption efficiency factor the coefficient of heat transfer with external media,and the specific heat of the bolometer. Calculations show that the systematic error in the recording of instantaneous pulsed light power with platinum bolometers for a wavelength of 10.6 μm does not exceed 19%.