High Frequency Sampling of TTL Pulses on a Raspberry Pi for Diffuse Correlation Spectroscopy Applications

Diffuse Correlation Spectroscopy (DCS) is a well-established optical technique that has been used for non-invasive measurement of blood flow in tissues. Instrumentation for DCS includes a correlation device that computes the temporal intensity autocorrelation of a coherent laser source after it has undergone diffuse scattering through a turbid medium. Typically, the signal acquisition and its autocorrelation are performed by a correlation board. These boards have dedicated hardware to acquire and compute intensity autocorrelations of rapidly varying input signal and usually are quite expensive. Here we show that a Raspberry Pi minicomputer can acquire and store a rapidly varying time-signal with high fidelity. We show that this signal collected by a Raspberry Pi device can be processed numerically to yield intensity autocorrelations well suited for DCS applications. DCS measurements made using the Raspberry Pi device were compared to those acquired using a commercial hardware autocorrelation board to investigate the stability, performance, and accuracy of the data acquired in controlled experiments. This paper represents a first step toward lowering the instrumentation cost of a DCS system and may offer the potential to make DCS become more widely used in biomedical applications.Radiation Monitoring Devices, Inc

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Not AvailableThis study reports income enhancement of rural women by their capacity building in Malihabad tehsil of Uttar Pradesh. The study is based on 60 farm women selected from small, marginal and landless households who were provided training for production of improved quality of dried mango slices, commonly known as khatai. The intervention included use of mango peeler, solar dehydrator, preservative and marketing of produce through an NGO. This led to enhancement of income to the tune of 51.0 per cent in small, 50.6 per cent in marginal and 47.6 per cent in landless farm families. The use of mango peeler enhanced slice recovery by 4.5 per cent and reduced time in peeling mango by 26.5 per cent over the traditional method. The use of solar dehydrator enhanced temperature by 8–10 ºC over ambient temperature which helped in fast and uniform drying of slices. The mango slices produced through improved method contains lower were of superior quality with moisture-content (8.4%) and non-enzymatic browning (0.4) and high titrable acidity (21.3%) and total phenol (0.2 g/100g) as compared to the traditional produce.Not Availabl