Fuel debris removal is an issue in the decommissioning of the Fukushima Daiichi Nuclear Power Plant. Fuel debris removal poses many technical and safety problems, such as high radiation levels and poor visibility environment. Ultrasonic sensing technology can overcome the above problems. In order to achieve high resolution in long-distance ultrasonic imaging, an ultrasonic array sensor with a wide aperture and a transducer with a high frequency and a wide receiving directional angle are indispensable. However, in order to propagate ultrasonic waves over a long distance, the receiving directional angle of ultrasonic transducers in media with slow sound velocity, such as in water or air, becomes narrower (±10°). In order to overcome these challenges, Shoji of the Muroran Institute of Technology has developed a new ultrasonic signal reception method, Photoacoustic Probes System, based on the interaction between laser light and ultrasound (Shoji, Proceedings of the Symposium on Visualization, 2024). When a beam of light sufficiently narrower than the sound wavelength crosses a sound wave, it is known that the refractive index gradient causes the light to curve up and down with the phase of the sound (Takagi et al., Ultrasonics and Materials. The Japan Society for Materials Science, Shokabo, Tokyo, 1992). In this study, we verified various characteristics of a photoacoustic probe system that utilizes this principle. As a result, it was found that the same probe can receive ultrasonic waves over a wide frequency range, and that the signal-to-noise ratio of the received signal improves when the laser intensity is increased. A sensor based on the photoacoustic probe system was also fabricated and successfully received reflected and scattered ultrasound.