초록 ▼

An analog detection system for determining a ring-down rate or decay rate 1/.tau. of an exponentially decaying ring-down beam issuing from a lifetime or ring-down cavity during a ring-down phase. Alternatively, the analog detection system determines a build-up rate of an exponentially growing beam i

An analog detection system for determining a ring-down rate or decay rate 1/.tau. of an exponentially decaying ring-down beam issuing from a lifetime or ring-down cavity during a ring-down phase. Alternatively, the analog detection system determines a build-up rate of an exponentially growing beam issuing from the cavity during a ring-up phase. The analog system can be employed in continuous wave cavity ring-down spectroscopy (CW CRDS) and pulsed CRDS (P CRDS) arrangements utilizing any type of ring-down cavity including ring-cavities and linear cavities.

대표청구항 ▼

[ What is claimed is:] [1.]1. A ring-down cavity system comprising:a) a ring-down cavity;b) a light source for injecting a pump beam into said ring-down cavity such that said ring-down cavity issues an exponentially growing ring-up beam having a ring-up rate while said pump beam is being injected an

[ What is claimed is:] [1.]1. A ring-down cavity system comprising:a) a ring-down cavity;b) a light source for injecting a pump beam into said ring-down cavity such that said ring-down cavity issues an exponentially growing ring-up beam having a ring-up rate while said pump beam is being injected and such that said ring-down cavity issues an exponentially decaying ring-down beam having a decay rate when said pump beam is interrupted;c) a photodetector for receiving said exponentially growing ring-up beam and said exponentially decaying ring-down beam and said generating an exponentially growing analog signal and an exponentially decaying analog signal;d) a converter for converting said exponentially growing analog signal to a first linear analog having a slope indicative of said ring-up rate and converting said exponentially decaying analog signal to a second linear analog signal having a slope indicative of said decay rate; ande) an analog signal processing circuit for determining said ring-up rate and said decay rate.