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John David Lambert

Joseph Ernest Dryer

Ian James Lambert

A method and apparatus to monitor and document that proper hygienic procedures are followed by food service providers consisting of a camera, a processor controlling the camera, and software to accomplish the hand washing monitoring. The criteria for identifying the start and end of a hand washing event by monitoring activity is selected areas is presented. A record is created of the wash event including a sequence of photograph during the event and additional related data such as start time, duration, location, and any employee identification. This record is available for recording or downloading to a server for further manipulation, including washer identification and statistical analysis.

Apparatus and method for monitoring hand washing

Embodiments of the invention provide an algorithm for enhancing the transit time measurement of an ultrasonic wave through a fluid, and criteria for evaluating the suitability for various waveforms with regard to noise rejection. The transit time calculation provides a greater noise immunity and accuracy than techniques used in the prior art, and allows a measure of weighting of dispersed signals with different arrival times. The transit time calculation utilizes either the transmitted signal or the measurement of a reference system, the calculation of the squared convolution of this signal with the received signal, and the calculation of the transit time from the time-weighted squared convolution signal over a suitable interval defined by the minimums of the squared convolution signal. In the case of dispersion where the arrival times are symmetrically displaced around a mean transit time, or if asymmetric dispersion is suitably within the main lobe, the calculation properly weights the composite signal. The symmetry of the calculated autocorrelation function predicts the accuracy of the algorithm, and deconvolution can be used to estimate the composition of the composite delay function in such cases.

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Katy, TX, United States of America

John David Lambert