Browse Prior Art Database

FTIR Photoacoustic Mapper

IP.com Disclosure Number: IPCOM000046091D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Gerson, DJ: AUTHOR

Abstract

A commercially available Fourier Transform Infrared (FTIR) Spectrometer is modified to permit the recording of FTIR spectra of optically opaque materials using a photoacoustic effect. In the drawing, an IBM Instruments Inc. IR/85 FTIR Spectrometer includes a source l of infraredenergy. An off axis ellipsoidal mirror 2 directs IR energy into a Michelson interferometer including a beam splitter 3, a fixed mirror 4 and a movable mirror 5. The output of the interferometer is directed by an off-axis ellipsoidal mirror 6 into a similar type mirror 7 that has been added to the spectrometer. Mirror 7 focuses the IR energy onto an array 8 of piezoelectric transducers (PZTs). The PZT's pick up an acoustic IR signal of a sample (not shown) placed in contact with the array, when the sample is irradiated with IR energy.

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FTIR Photoacoustic Mapper

A commercially available Fourier Transform Infrared (FTIR) Spectrometer is modified to permit the recording of FTIR spectra of optically opaque materials using a photoacoustic effect. In the drawing, an IBM Instruments Inc. IR/85 FTIR Spectrometer includes a source l of infraredenergy. An off axis ellipsoidal mirror 2 directs IR energy into a Michelson interferometer including a beam splitter 3, a fixed mirror 4 and a movable mirror 5. The output of the interferometer is directed by an off-axis ellipsoidal mirror 6 into a similar type mirror 7 that has been added to the spectrometer.

Mirror 7 focuses the IR energy onto an array 8 of piezoelectric transducers (PZTs). The PZT's pick up an acoustic IR signal of a sample (not shown) placed in contact with the array, when the sample is irradiated with IR energy. Each PZT then translates the pseudoacoustic signal into an electrical signal that is amplified by an amplifier 9 and fed into the electronics of the spectrometer for analysis by the data system thereof. This array system allows two unique sampling features: first, the recording of IR spectra of optically opaque materials and, second, a three-dimensional map of a large sample.

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