Cavity ring-down spectroscopy device with internal cavity intensity detector

摘要

A cavity ring-down spectroscope includes a ring-down cavity [110]. A trigger detector [135] is optically coupled within the ring-down cavity [110] to generate a signal to indicate a desired radiation level in the ring-down cavity [110]. A controller [150] is coupled to the trigger detector [135] to control light provided to the ring-down cavity [110]. A ring-down time may then be measured.