Title :
High-resolution spectrometer systems based on SAW chirp filters
Author :
Zhang, Yuxing ; Gong, Junjie ; Zhou, Xianwen ; Yulan Wei ; Cheeke, J.D.N.
Author_Institution :
Dept. of Phys., Concordia Univ., Montreal, Que., Canada
Abstract :
In this paper, two high-resolution spectrometer systems based on SAW Chirp-Z-Transform are reported. To achieve high frequency resolutions of 15 kHz (for unweighted compressor) and 20 kHz (for weighted compressor), two SAW RAC, with 68 μs dispersion duration each, are cascaded as an expander to offer a long-duration chirp signal and another RAC also with 68 μs dispersion is used as the compressor. Both systems are developed in the form of independent modules, and can be used as general-purpose spectrometer subsystems
Keywords :
VHF filters; Z transforms; chirp modulation; radiofrequency spectrometers; spectral analysers; surface acoustic wave filters; surface acoustic wave signal processing; ultrasonic arrays; 140 MHz; 15 kHz; 20 kHz; 68 mus; 85 MHz; SAW Chirp-Z-Transform; SAW RAC; SAW chirp filters; dispersion duration; expander; high frequency resolution; high-resolution spectrometer systems; long-duration chirp signal; spectrometer subsystems; unweighted compressor; weighted compressor; Bandwidth; Chirp; Convolution; Delay effects; Filters; Frequency; Signal resolution; Space technology; Spectroscopy; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.662986
