Abstract

A simple theory is generated for crossed-beam thermal lens and photothermal deflection in flowing sample streams. This theory is used to analyze time-resolved crossed-beam thermal lens data. The result of the regression analysis may be used as a good probe of flow velocity in the 0.2–30-mm/sec range in liquid streams. Faster flow velocity should be measurable in gas streams.

© 1985 Optical Society of America

Gas velocity measurements using photothermal deflection spectroscopy

Jeffrey A. Sell
Appl. Opt. 24(22) 3725-3735 (1985)

Time-resolved flow-velocity and concentration measurements using a traveling thermal lens

H. Sontag and A. C. Tam
Opt. Lett. 10(9) 436-438 (1985)

Measurements of very low gas flow velocities by photothermal deflection spectroscopy

Y.-X. Nie, K. Hane, and R. Gupta
Appl. Opt. 25(18) 3247-3252 (1986)

Linear imaging of gas velocity using the photothermal deflection effect

Jeffrey A. Sell and Robert J. Cattolica
Appl. Opt. 25(9) 1420-1428 (1986)

Quantitative photothermal deflection spectroscopy in a flowing stream of gas

Jeffrey A. Sell
Appl. Opt. 23(10) 1586-1597 (1984)