| 摘要 |
PROBLEM TO BE SOLVED: To provide a thermal lens absorption spectrophotometer which does neither require a high accuracy in alignment to facilitate alignment work and nor require experienced skills in measurement to enable a simple, quick measurement and in which a disturbance hardly causes an influence to decrease an error in the measurement as much as possible. SOLUTION: An excitation light e is made incident on a sample 12 to form a gradient of a refractive index by heat, a probe light p is made to strike on the sample from a direction crossing the excitation light to measure the quantity of deflection of the probe light caused by the gradient of the refractive index and the absorbance of the sample is measured. The probe light is composed of two parallel beams, and a change in a detection signal caused by a disturbance is automatically corrected by obtaining the absorbance from the product of quantities of deflection of the two beams by a detection system 30. The detection system comprises e.g., a symmetrically-shaped reflector 32 reflecting the two beams in opposite directions to each other, linear position sensors 34 and 36 receiving the two beams and a multiplier 38 for obtaining the product of the detection signals from them. COPYRIGHT: (C)2004,JPO&NCIPI
|
