PROBLEM TO BE SOLVED: To provide an optoacoustic measuring instrument which allows measurement with high accuracy while controlling so that the amount of light by illumination means, caused by a measurement position difference, is made optimum.SOLUTION: The optoacoustic measuring instrument includes: a pressure holding means constituted of flat plates for pressuring an object to be measured the illumination means for illuminating the object to be measured with the use of light from a pulse light source via the pressure holding means and an ultrasonic detecting means for detecting ultrasonic wave due to the light made incident on the object to be measured from the illumination means, as an optoacoustic signal. The instrument also includes: an information storage means for previously storing information concerning relation between the mechanical change of the pressure holding means, the illumination means or the ultrasonic detecting means, and the change of the light amount and a light amount adjusting means for adjusting the light amount, based on the information of the information storage means with respect to the mechanical change of the pressure holding means, the illumination means or the ultrasonic detecting means.COPYRIGHT: (C)2010,JPO&INPIT【課題】測定位置の違いによって発生する照明手段による光量を最適になるように制御することができ、高精度の計測が可能となる光音響計測装置を提供する。【解決手段】被測定物を圧迫する平板により構成された圧迫保持手段と、パルス光源からの光を前記圧迫保持手段を介して前記被測定物に照明する照明手段と、前記照明手段から被測定物に入射した光による超音波を光音響信号として検出する超音波検出手段と、を備えた光音響計測装置であって、前記圧迫保持手段、前記照明手段あるいは前記超音波検出手段における機械的な変化と光量の変化との関係についての情報が、予め記憶された情報記憶手段と、前記圧迫保持手段、前記照明手段あるいは前記超音波検出手段における機械的な変化に対し、前記情報記憶手段による前記情報に基づいて光量を調整する光量調整手段と、を有する構成とする。【選択図】 図1
