Simple technique for obtaining photoacoustic spectra corrected for the spectral variation of the source in single scan.
A simple technique is presented to obtain normalized photoacoustic (PA) spectra corrected for the spectral variation of the source in a single scan. The input light beam is passed through the center of a dual slot chopper, which splits it into two chopped output beams at two different frequencies at a fixed ratio. The beams fall on the sample and the reference kept side-by-side in the same sample chamber. The PA signals are detected by a microphone and processed by two lock-in amplifiers tuned at two different frequencies. The technique is tested by recording the PA spectra of standard samples.
Sathiyamoorthy
K
K
Department of Physics, Indian Institute of Technology Madras, Chennai, India.
Vijayan
C
C
Kothiyal
M P
MP
D000162:Acoustics / Q000295:instrumentation; D055095:Optics and Photonics / Q000295:instrumentation; D015203:Reproducibility of Results; D013057:Spectrum Analysis / Q000295:instrumentation / Q000379:methods