PROBLEM TO BE SOLVED: To provide an acoustic wave detection apparatus capable of obtaining a high detection sensitivity at low cost.SOLUTION: The acoustic wave detection apparatus projects measurement light onto an interference film and measures the intensity of an acoustic wave incident to the interference film, based on the intensity of the measurement light reflected off the interference film, the acoustic wave detection apparatus comprising: an interference film formed of two opposing reflective layers a first light source capable of projecting light onto at least two different positions of the interference film and changing the wavelength of the light a photodetector for detecting the intensity of reflection, or the light which is projected onto and reflected off the interference film a signal acquisition unit for acquiring an electrical signal corresponding to an acoustic wave incident to the interference film, based on a change of the intensity of the reflection detected by the photodetector a wavelength acquisition unit for acquiring a reference wavelength, which is the wavelength of the measurement light projected when measurement is performed on a first point on the interference film and a wavelength control unit which determines, based on the reference wavelength, the wavelength of the measurement light to be projected when the measurement is performed on a second point on the interference film, and sets the determined wavelength to the first light source.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2016,JPO&INPIT【課題】低いコストで高い検出感度が得られる音響波検出装置を提供する。【解決手段】干渉膜に計測光を照射し、前記干渉膜で反射した計測光の強度に基づいて、前記干渉膜に入射した音響波の強度を計測する音響波検出装置であって、対向する二枚の反射層からなる干渉膜と、前記干渉膜の少なくとも異なる二点以上の場所に光を照射可能な光源であって、光の波長を変更可能な第一の光源と、前記光が前記干渉膜で反射した反射光の強度を検出する光検出器と、前記光検出器が検出した反射光の強度の変化に基づいて、前記干渉膜に入射した音響波に対応する電気信号を取得する信号取得部と、前記干渉膜上にある第一の点に対して計測を行った際に照射した計測光の波長である参照波長を取得する波長取得部と、前記干渉膜上にある第二の点に対して計測を行う際に照射する計測光の波長を、前記参照波長に基づいて決定し、前記第一の光源に設定する波長制御部と、を有する。【選択図】図1
