Patent ID: 7034325

Claim:
A device for measuring a gas concentration, comprising: a cavity (C) containing at least one gas for which the concentration is to be measured, at least one first emitter (E 1 ) composed of an optical micro-cavity pumped by optical pumping means and for which the emission spectrum is within the gas absorption band, at least one second emitter (E 2 ) composed of an optical micro-cavity pumped by optical pumping means and for which the emission spectrum is outside the gas absorption band, a reception means (Ri) for measuring the optical intensity (I) of a first radiation output from the first emitter (E 1 ) and transmitted through the cavity (C), and the optical intensity (I 0 ) of a second radiation output from the second emitter (E 2 ) and transmitted through the cavity (C), and a processing circuit (T) for measuring the gas concentration (N) starting from the optical intensity (I) of the first radiation and the optical intensity (I 0 ) of the second radiation.