Patent ID: 7323677
Filing Date: 2008-01-29
Classification: G01J

Abstract:
1. A method of determining temperature by measuring fiber grating loop ringdown comprising: a) exposing a grating of an apparatus to an environment which exhibits variation in temperature, the apparatus comprising a coherent light source, a first coupler configured to receive light from said light source, a second coupler, a detector connected to said second coupler, a data acquisition system connected to said detector, and a first fiber grating, wherein the first and second couplers are in optical communication with each other along two or more light paths, and wherein at least one light path comprises said first fiber grating, the light paths being configured such that at least one fiber grating loop is formed between said first and said second coupler; b) emitting a light pulse into the fiber grating loop; and c) measuring an observed ringdown time for the light pulse.