Results 251 to 260 of about 13,605,822 (324)

Emissivity determination using the photoacoustic effect

Applied Optics, 2018
We show that emissivities in the near infrared can be determined relative to a reference surface employing the photoacoustic effect. The photoacoustic cell is equipped with two windows and a pair of synchronously moving chopping wheels so that the cell alternately views the test and the reference surface.
Yaqi, Zhang, Gerald J, Diebold
openaire   +3 more sources

Needle visualization using photoacoustic effect

SPIE Proceedings, 2015
We investigated a novel needle visualization using the PA effect to enhance needle-tip tracking. An optical fiber and laser source are used to generate acoustic waves inside the needle with the PA effect. Acoustic waves are generated along the needle. Some amount of acoustic energy leaks into the surrounding material.
Hyun Jae Kang, Xiaoyu Guo, Alexis Cheng, Michael A. Choti, Emad M. Boctor   +4 more
openaire   +2 more sources

Pulsed Laser Excited Photoacoustic Effect for Disease Diagnosis and Therapy.

Chemistry, 2022
Pulsed laser can excite light absorber to generate photoacoustic (PA) effect, that is, when the absorber is irradiated with pulsed laser, the absorbed light energy is converted into local heat to cause rapid thermoelastic expansion and generate acoustic ...
Zhixiong Wang, Meixiao Zhan, Xianglong Hu   +2 more
semanticscholar   +1 more source

Boosting Photoacoustic Effect via Intramolecular Motions Amplifying Thermal-to-Acoustic Conversion Efficiency for Adaptive Image-Guided Cancer Surgery.

Angewandte Chemie, 2021
Photoacoustic (PA) imaging emerges as a promising technique for biomedical applications. The development of new strategies to boost PA conversion without depressing other properties (e.g., fluorescence) is highly desirable for multifunctional imaging but
Heqi Gao, Xingchen Duan, Di Jiao, Yi Zeng, Xiaoyan Zheng, Jingtian Zhang, Hanlin Ou, Ji Qi, D. Ding   +8 more
semanticscholar   +1 more source

An optofluidic dye concentration detector based on the pulsed photoacoustic effect

BiOS, 2021
We report the development of an opto-acousto-fluidic platform by combining an illumination source in the form of a pulsed laser, a microfluidic channel, and an ultrasound transducer to detect photoacoustic signals generated from the fluid sample inside ...
Kaustav Roy, Anjali Thomas, Souradip Paul, Anuj Ashok, Vijayendra Shastri, Kritank Kalyan, M. S. Singh, R. Pratap   +7 more
semanticscholar   +1 more source

Moiré signals by the photoacoustic effect

Optics Letters, 1990
We report the detection of moiré displacement signals using the photoacoustic effect. By using the transmission and reflection (absorption) gratings with a 25microm pitch, the lateral displacement of the grating is detected from the photoacoustic signals.
K, Hane, S, Watanabe, S, Hattori, T, Goto   +3 more
openaire   +2 more sources

Effect of Optimized Irrigation With Photon‐Induced Photoacoustic Streaming on Smear Layer Removal, Dentin Microhardness, Attachment Morphology, and Survival of the Stem Cells of Apical Papilla

Lasers in Surgery and Medicine, 2021
This study aimed to evaluate the effect of optimized irrigation with photon‐induced photoacoustic streaming (PIPS) activation of different irrigants (distilled water or ethylenediaminetetraacetic acid [EDTA]) on smear layer removal, dentin microhardness,
Lixuan Wu, Shan Jiang, Huan Ge, Z. Cai, Xiaojing Huang, Chengfei Zhang   +5 more
semanticscholar   +1 more source