Duty Ratio Thresholds for Regular Transmission at Human Tissue of Near-Infrared Square-Wave Pulse

Abstract:

In order to understand the transmission mechanism at human tissue of near-infrared square-wave pulse (NIRSP), an experimental study of the duty ratio threshold for regular transmission at the fingertip and palm of human hand by NIRSP was carried out by using a couple of simple transmitting and receiving device with tunable duty ratios, and also the light emitting diodes (LED) both at the wavelengths of 850 nm and 940 nm. The thresholds were determined by measuring the waveforms of the changed voltages of NIRSP receiving system as a measurement of the transmission at human tissue. When the receiving waveforms were taken on the certain behavior as the emitting waveforms, the duty ratio threshold for regular transmission at human tissue of NIRSP was observed. The experimental results show that the duty ratio is an important index for the transmission at human tissue of NIRSP. And the duty ratio thresholds for regular transmission both at the fingertip and palm of NIRSP at the wavelength of 850 nm and 940 nm have been given.

• Periodical: Applied Mechanics and Materials (Volumes 333-335)
• Pages: 555-558
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.333-335.555
• Online since: July 2013
• Authors: Jian Wang, Shuo Guo Li
• Keywords: Duty Ratio, Human Tissue, Light Emitting Diode (LED), Near Infrared Square-Wave Pulse, Threshold, Transmission

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