The photoacoustic effect or optoacoustic effect is the formation of sound waves following light absorption in a material sample. In order to obtain this effect the light intensity must vary, either periodically (modulated light) or as a single flash (pulsed light).

The photoacoustic effect is an emerging technology that has sparked significant interest in the research field since an acoustic wave can be produced simply by the incidence of light on a material or tissue.

1980年1月1日 · The photoacoustic effect is the basis for photoacoustic spectroscopy, a rapidly developing technique for studying optical absorption in many solid and liquid samples which are difficult to study by conventional means.

The photoacoustic effect is the physical phenomenon of an acoustic wave excited through the interaction of modulated electromagnetic waves (i.e., laser pulses) with matter. There are five important mechanisms responsible for the photoacoustic signal generation, including dielectric breakdown, vaporization, thermoelastic expansion ...

photoacoustic effect in solids, the so-called R-G Theory.2 The basic principle of all photother-mal (PT) techniques is the absorption of light in a sample with a subsequent change of its thermal state. This may be either a change of the temperature or other thermodynamical parameter of the sample related to the temperature.

Photoacoustic spectroscopy is the measurement of the effect of absorbed electromagnetic energy (particularly of light) on matter by means of acoustic detection.

2005年8月11日 · The photoacoustic effect is the production of an acoustic signal when a sample in an enclosed cell is illuminated with chopped light. The absorbed light produces a periodic heat flow from the sample to the surrounding gas and backing material, causing pressure variations in the gas which are detected by a sensitive microphone.

In this concise review, we first introduce the basic principles and typical system designs of PAM, including optical-resolution PAM and acoustic-resolution PAM. The major imaging characteristics of PAM, i.e. spatial resolutions, penetration depth, and scanning approach are discussed in detail.

2023年3月10日 · Photoacoustic spectroscopy (PAS) uses acoustic waves produced from materials which are exposed to light to measure its concentration. PAS is unique in that it combines heat measurements with optical microscopy.

Generally, the photoacoustic effect occurs when an intermittent light beam falls on the sample placed in the photoacoustic cell. The pressure oscillation in the photoacoustic cell is detected by a microphone.