Measurement methodology of projectors in confined environment
The intent of this paper is to describe the first stages of potentially ongoing collaborative research between the United States Naval Research Laboratory's Underwater Sound Reference Detachment (USRD) and France's DCN In genierie cenae Sud Departement Lutte Sous-Marine (DCN/SUD/DLSM). The immediate focus of this collaborative work is on high Q electroacoustic transducer calibration in reverberation limited environments. This paper will be divided into three sections: the first one, a description of the motivating problem in reverberation limited measurements, the second one, a description of the two techniques developed by each laboratory, finally, research results and the activities necessary to complete the work in progress
High energy muons generated by air showers can be detected with atmospheric Cerenkov imaging telescopes via their ring signature. The distribution of Cerenkov light along the ring is a function only of the muon's distance of impact from the telescope: this property makes possible the calibration of the photon collection efficiency of imaging telescopes. We evaluate the acceptance of an imaging Cerenkov telescope to muons and discuss its application to the study of cosmic rays. We point out that muons may set a gamma-ray flux sensitivity limit for ground-based gamma-ray telescopes.