Title :
A low-light-level sensor for medical diagnostic applications
Author :
Perelman, Yevgeny ; Ginosar, Ran
Author_Institution :
Dept. of Electr. Eng., Technion-Israel Inst. of Technol., Haifa, Israel
fDate :
10/1/2001 12:00:00 AM
Abstract :
A low-level light sensor and preprocessor for a disposable medical probe is described. A 10-Hz 4-μA/cm2 input optical signal in the visible spectrum is assumed in chemoluminant diagnostic applications. A single-bit first-order sigma-delta modulator has been employed for analog-to-digital conversion, thanks to its robustness, simplicity, inherent linearity, and high signal-to-noise ratio. A current buffer has been used to replicate the weak signal with sufficient bandwidth. Tests have shown the feasibility of this approach, and have also enabled improvements of the design
Keywords :
biomedical electronics; buffer circuits; chemiluminescence; patient diagnosis; photodetectors; sigma-delta modulation; analog-to-digital conversion; chemoluminant reaction; current buffer; disposable medical probe; low-light-level sensor; medical diagnostics; optical signal; preprocessor; sigma-delta modulator; signal-to-noise ratio; visible spectrum; Analog-digital conversion; Biomedical optical imaging; Delta-sigma modulation; Medical diagnosis; Medical diagnostic imaging; Optical buffering; Optical modulation; Optical sensors; Probes; Sensor phenomena and characterization;
Journal_Title :
Solid-State Circuits, IEEE Journal of
