Abstract:A bridge resistance deviation-to-time interval converter is presented for interfacing resistive sensor bridges. It consists of two voltage-to-current converters, two current-tunable Schmitt triggers, a ramp integrator, and two logic gates. A prototype circuit built using discrete components exhibits a conversion sensitivity amounting to 4527.8 µs/Ω over the resistance deviation range of 0-2 Ω and a linearity error less than ±0.01%.

This study investigated the effects of 30% oxygen administration on visuospatial cognitive ability using time course data analysis of fMRI. A visuospatial task was presented while brain images were scanned by a 3T MRI system. The results showed that there was an improvement in performance and also increased BOLD intensity in the parietal lobe in the higher oxygen condition. There was positive relation between behavior performance and BOLD intensity in the right parietal lobe. This result supports the conclusion that the increase in the cognitive processing ability due to highly concentrated oxygen can be explained by the increase in the BOLD intensity.

Abstract:A simple resistance-to-time converter is presented for interfacing resistive bridge sensors. It consists of two voltage comparators, a ramp voltage generator, and two logic gates. A prototype circuit built using discrete components exhibit a conversion sensitivity amounting to 2832.4 µs/Ω over the resistance deviation range of 0-2 Ω and a linearity error less than 0.005%. Power dissipation of the converter is 15.57 mW.

In this paper, we describe the feasibility of developing a new plastic optical fiber temperature sensor using a thermosensitive clouding material (TSCM) that changes its light transmittance with temperature. The temperature change in the TSCM gives rise to change in the turbidity of the TSCM, and the transmittance of the TSCM is altered according to the turbidity change. Light with a selected wavelength is transmitted to the TSCM, and the optical power of the reflected light from a reflector is measured using a Y-coupler made of plastic optical fibers.

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