Fluid composition analysis mechanism, calorific value measurement device and power plant, and fluid composition analysis method

摘要

The fluid composition analysis mechanism includes a light source (12) that irradiates the sample fluid at the measurement position with excitation light, and a light receiving unit (17) that receives and scatters Raman scattered light generated from the sample fluid irradiated with the excitation light. The composition of the sample fluid is calculated on the basis of the Raman scattered light condensing optical system (16) for condensing the Raman scattered light generated at the measurement position onto the light receiving portion and entering the light receiving portion, and the output of the light receiving portion. And a light shielding member (18) disposed on the optical path of the excitation light or on an extension line thereof.