A system (1; 100) for detecting electromagnetic radiation, comprising: ∘ a substrate, called readout substrate (10; 110); ∘ at least one thermal detector (50; 150), comprising: • an absorbent membrane (53; 153) for absorbing the electromagnetic radiation, ▪ thermally insulated from the readout substrate (10; 110), and ▪ comprising a thermometric detection transducer (60; 160) selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material; • a reflector (51; 171) for reflecting the electromagnetic radiation, ▪ arranged between the absorbent membrane (53; 153) and the readout substrate; ∘ at least one compensation device (30; 130), comprising: • a thermometric compensation transducer (40; 140)selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material, ▪ in thermal contact with the readout substrate; ∘ a readout circuit (12; 112), • arranged in the readout substrate, and designed to apply an electrical signal to the thermal detector (50; 150) and to the compensation device (30; 130); characterized in that the thermometric compensation transducer (60; 160) is: • arranged between the reflector (51; 171) and the readout substrate (10; 110), and • situated facing the reflector (51; 171) so as to be optically insensitive to the incident electromagnetic radiation. ∘ a substrate, called readout substrate (10; 110); ∘ at least one thermal detector (50; 150), comprising: • an absorbent membrane (53; 153) for absorbing the electromagnetic radiation, ▪ thermally insulated from the readout substrate (10; 110), and ▪ comprising a thermometric detection transducer (60; 160) selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material; • a reflector (51; 171) for reflecting the electromagnetic radiation, ▪ arranged between the absorbent membrane (53; 153) and the readout substrate; • an absorbent membrane (53; 153) for absorbing the electromagnetic radiation, ▪ thermally insulated from the readout substrate (10; 110), and ▪ comprising a thermometric detection transducer (60; 160) selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material; ▪ thermally insulated from the readout substrate (10; 110), and ▪ comprising a thermometric detection transducer (60; 160) selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material; • a reflector (51; 171) for reflecting the electromagnetic radiation, ▪ arranged between the absorbent membrane (53; 153) and the readout substrate; ▪ arranged between the absorbent membrane (53; 153) and the readout substrate; ∘ at least one compensation device (30; 130), comprising: • a thermometric compensation transducer (40; 140)selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material, ▪ in thermal contact with the readout substrate; • a thermometric compensation transducer (40; 140)selected from among a p-n junction or PIN diode, a field-effect transistor, or a thermistor material, ▪ in thermal contact with the readout substrate; ▪ in thermal contact with the readout substrate; ∘ a readout circuit (12; 112), • arranged in the readout substrate, and designed to apply an electrical signal to the thermal detector (50; 150) and to the compensation device (30; 130); • arranged in the readout substrate, and designed to apply an electrical signal to the thermal detector (50; 150) and to the compensation device (30; 130); characterized in that the thermometric compensation transducer (60; 160) is: • arranged between the reflector (51; 171) and the readout substrate (10; 110), and • situated facing the reflector (51; 171) so as to be optically insensitive to the incident electromagnetic radiation. • arranged between the reflector (51; 171) and the readout substrate (10; 110), and • situated facing the reflector (51; 171) so as to be optically insensitive to the incident electromagnetic radiation.