Application of logarithmic analog operator with high-accuracy ratio in biochemical analyzer

Jingfeng Wang; Zhihua Liu; Jiaxin Xiong; Yongsheng Tan

doi:10.1117/12.482982

12 September 2002 Application of logarithmic analog operator with high-accuracy ratio in biochemical analyzer

Jingfeng Wang, Zhihua Liu, Jiaxin Xiong, Yongsheng Tan

Proceedings Volume 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment; (2002) https://doi.org/10.1117/12.482982
Event: Photonics Asia, 2002, Shanghai, China

Abstract

A new analog logarithmic(Log.) operating method based on lambert-Bill's law in a biochemical analyzer is researched in this paper. We use the relationship ofthe voltage across the capacitor Log. to the time of discharging when the capacitor is discharged, change the relationship of transmittance and the concentration of a solution to the relationship of the voltage across the capacitor and the time of discharging, the concentration of the solution is gotten easily. This operator exists between pure analog and pure logic Log. operator, which avoids theory error produced by logic Log. operator fully, absorbs the merits of low cost and fast working speed of analog Log. operator, uses a large dynamic program controlled gain amplifier to improve adaptation range of input signal. thus a high operating accuracy and speed are obtained . At the same time correlate measuring experiments are done and error analyzing are produced.

Citation Download Citation

Jingfeng Wang, Zhihua Liu, Jiaxin Xiong, and Yongsheng Tan "Application of logarithmic analog operator with high-accuracy ratio in biochemical analyzer", Proc. SPIE 4916, Optics in Health Care and Biomedical Optics: Diagnostics and Treatment, (12 September 2002); https://doi.org/10.1117/12.482982

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