Fiber-optic based cavity ring-down spectroscopy apparatus

A measuring gas or liquid sample module the material for detecting and device. A element is expose of the ring of the optical fibre ring is formed on the gas or the liquid sample. The radiator for adhesive source sending out an optical fibre ring; the heat dissipation is received and optical fibre front output end. The optical fibre ring of the part is expose between the input end and output end of the sample gas or the liquid sample. The processor is connected with the receiving device, and based on the radiation attenuation and optical fibre environment of determining the gas or the liquid sample module the material level.