Bubble chamber for chemical analysis: a new concept

Jerry H. Atencio; Xin Luo; Andrew W. McCown; E. Iain McCreary; Robert K. Sander

doi:10.1117/12.206443

7 April 1995 Bubble chamber for chemical analysis: a new concept

Jerry H. Atencio, Xin Luo, Andrew W. McCown, E. Iain McCreary, Robert K. Sander

Proceedings Volume 2385, Advanced Optical Methods for Ultrasensitive Detection; (1995) https://doi.org/10.1117/12.206443
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

A new technique for the detection of trace concentrations of molecules in solution has been developed. This system utilizes the amplification characteristics of a bubble chamber in which energy deposition from laser absorption is monitored. In the experimental set-up, a trace quantity of solute is introduced into liquid propane that is contained in a small (10 ml) stainless steel cell at 120 psi. The propane is superheated by sudden reduction of the cell pressure. Before wall nucleated boiling occurs, target solute molecules are energized by a laser pulse. Absorption of pump laser energy results in the formation of nucleation centers which develop into bubbles and which in turn are detected by CCD camera. Preliminary experiments with crystal violet used as a test absorber have demonstrated detection sensitivity of 10 parts per trillion (ppt).

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Jerry H. Atencio, Xin Luo, Andrew W. McCown, E. Iain McCreary, and Robert K. Sander "Bubble chamber for chemical analysis: a new concept", Proc. SPIE 2385, Advanced Optical Methods for Ultrasensitive Detection, (7 April 1995); https://doi.org/10.1117/12.206443

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KEYWORDS

Absorption

Molecules

Crystals

Liquids

Spectroscopy

Pulsed laser operation

Laser energy

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