Definition of photoacoustic

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Photonics Dictionary

photoacoustic: Photoacoustic refers to the generation of acoustic (sound) waves following the absorption of light (usually laser pulses) by a material. This phenomenon occurs when light energy is absorbed by a material, leading to localized heating and subsequent thermal expansion, which generates pressure waves (sound waves) that can be detected using ultrasonic sensors.

The photoacoustic effect is utilized in various scientific and medical applications, including:

Photoacoustic imaging (PAI): A biomedical imaging technique that uses the photoacoustic effect to produce high-resolution images of tissues. It combines the advantages of optical imaging (high contrast) with ultrasound imaging (deep tissue penetration). This method is particularly useful for visualizing blood vessels, tumors, and other structures rich in optical absorbers.

Photoacoustic spectroscopy: An analytical technique used to study the absorption characteristics of materials. It is highly sensitive and can be used to detect trace amounts of substances in gases, liquids, and solids.

Environmental monitoring: Photoacoustic sensors can detect pollutants and other substances in the air, making it a valuable tool for monitoring air quality and detecting hazardous materials.

Thermal therapy monitoring: In medical treatments that involve heating tissues (e.g., laser therapy, hyperthermia), photoacoustic methods can be used to monitor temperature changes and ensure the safety and effectiveness of the procedure.

Overall, the photoacoustic effect bridges the gap between optical and acoustic technologies, providing a versatile tool for various scientific, medical, and industrial applications.