Method for acquiring information representative of a fingerprint, executed by a device comprising an active thermal sensor on which a body part bearing a fingerprint is placed when said device is remotely presented in front of a reading terminal producing an electromagnetic field able to generate an electrical power supply in said device, said sensor comprising a plurality of pixels, each pixel comprising a thermosensitive element able to convert a change in temperature into a change in a parameter representative of a measurable electrical property of said thermosensitive element, called electrical parameter, each pixel being associated with a heating element designed to heat said pixel and being connected to a readout circuit able to measure the changes in said electrical parameter, the method comprising: for each pixel: starting a heating activation phase comprising: performing a first reset of the readout circuit connected to said pixel; and activating heating of said pixel by the heating element corresponding to said pixel; ending the first reset after a predetermined heating time; ending the heating by the heating element when a heating energy produced in the pixel by said heating element reaches a predetermined heating energy ; and measuring a first piece of information representative of the changes in the electrical parameter of said pixel after a predetermined waiting time following the end of the heating, the first piece of information corresponding to a period, called integration period, comprised between the end of the first reset and the end of the predetermined waiting time; performing a second reset of the readout circuit connected to said pixel; measuring , without heating by the heating element, a second piece of information representative of the changes in the electrical parameter of said pixel after a period equal to the integration period following the end of the second reset; and calculating a third piece of information representative of the changes in the electrical parameter of said pixel in the form of a difference between said first and said second piece of information; the information representative of the fingerprint being obtained on the basis of the third piece of information calculated for each pixel. starting a heating activation phase comprising: performing a first reset of the readout circuit connected to said pixel; and activating heating of said pixel by the heating element corresponding to said pixel; ending the first reset after a predetermined heating time; ending the heating by the heating element when a heating energy produced in the pixel by said heating element reaches a predetermined heating energy ; and measuring a first piece of information representative of the changes in the electrical parameter of said pixel after a predetermined waiting time following the end of the heating, the first piece of information corresponding to a period, called integration period, comprised between the end of the first reset and the end of the predetermined waiting time; performing a second reset of the readout circuit connected to said pixel; measuring , without heating by the heating element, a second piece of information representative of the changes in the electrical parameter of said pixel after a period equal to the integration period following the end of the second reset; and calculating a third piece of information representative of the changes in the electrical parameter of said pixel in the form of a difference between said first and said second piece of information; the information representative of the fingerprint being obtained on the basis of the third piece of information calculated for each pixel. <EOS>