The invention relates to a bolometer having an external surface (2) for the thermal absorption of incident radiation in thermal contact with a variable-resistance element (3) for measuring the resistance radiation (R) as a function of the temperature, the element (3) located in a heat-lock loop (6) having a corrector (14) for applying a heating power to a resistive heating means for maintaining the temperature of the resistance equal to a temperature (Tref) In accordance with the invention, the resistive heating means comprises the element (3), the corrector (14) is provided to generate a frequency component (S1) of the heating power, which is applied to a means ( 17) provided between the element (3) and the corrector (14) for applying to the element (3) a signal without DC component, means (19) for coupling, separate from the means (19), is provided between the element (3) and a polarization means (18) continuous operation to maintain the resistance at a prescribed continuous operating point.
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