In practice, an experimental comparison with Pt100 probes (uncertainty of 0.1 K) has shown that the estimated uncertainty levels are relatively compatible, although the linearity of the system does not appear to be very good. The uncertainty of the instrument itself, independent of that of the Cramer equation has been estimated at between 0.13 K to 0.09 K for distances ranging from 3 m to 11 m respectively. Several methods for the detection of arrival times were investigated, notably cross-correlation and cross-spectrum. It is based on time-of-flight measurement of ultrasound pulses at frequencies close to 40 kHz. * Corresponding author: present article describes an acoustic thermometer to measure the average air temperature integrated along a path ranging from 1 m to 11 m. Karim Mimoune, Joffray Guillory * and Mark Plimmer
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