Photoacoustic method for measuring concentration of chemical species

Patent · 31 December 2000

OSTI ID:873774

Autrey, S Thomas ^[1]; Posakony, Gerald J ^[2]; Amonette, James E ^[2]; Foster-Mills, Nancy S ^[2]

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1. West Richland, WA
2. Richland, WA

The present invention is a transducer for photoacoustic detection having at least two piezoelectric elements wherein at least a first piezoelectric element has a first frequency and at least a second piezoelectric element has a second frequency. The improvement according to the present invention is that at least two piezoelectric elements are longitudinal elements for longitudinal waves; and the first frequency is different from said second frequency. In other words, the invention is a multi-frequency longitudinal transducer for photoacoustic detection.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC06-76RL01830
• Assignee: Battelle Memorial Institute (Richland, WA)
• Patent Number(s): US 6244101
• Application Number: 09/322,910
• OSTI ID: 873774
• Country of Publication: United States
• Language: English

Related Subjects

/73/356/
according
chemical
chemical specie
chemical species
concentration
detection
electric element
electric elements
element
elements
frequency
improvement
longitudinal
longitudinal wave
longitudinal waves
measuring
measuring concentration
method
multi-frequency
photoacoustic
piezoelectric
piezoelectric element
piezoelectric elements
species
transducer
waves
words