Optoacoustic detection with a Helmholtz resonator: application to trace detection of carcinogens

Journal Article · Sun Feb 01 04:00:00 EST 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00130a031· OSTI ID:6971646

Choi, J G; Diebold, G J

The authors report the use of a Helmholtz resonator as an optoacoustic detection cell for a gas chromatograph. For this application, a Helmholtz resonator has two important advantages over a nonresonant acoustic cell. First, the microphone can be isolated, in this case, in a chamber some distance from the hot gas that elutes from the chromatography, thereby eliminating thermal damage to the microphone and its preamplifier. Second, a Helmholtz resonator can be designed to have both a small volume and an acoustic resonance at low frequency. Modulation of the incident laser beam at the resonance frequency thus gives an enhancement of the signal amplitude proportional to the quality factor of the resonance.

• Research Organization: Brown Univ., Providence, Rhode Island
• OSTI ID: 6971646
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:3; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
AROMATICS
CARCINOGENS
CHEMICAL ANALYSIS
CHLORIDES
CHLORINATED AROMATIC HYDROCARBONS
CHLORINE COMPOUNDS
CHROMATOGRAPHY
DATA
EXPERIMENTAL DATA
FLUORIDES
FLUORINE COMPOUNDS
GAS CHROMATOGRAPHY
HALIDES
HALOGEN COMPOUNDS
HALOGENATED AROMATIC HYDROCARBONS
INFORMATION
NUMERICAL DATA
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SEPARATION PROCESSES
SULFUR COMPOUNDS
SULFUR FLUORIDES
TRACE AMOUNTS