Hardware Design Of A New Rapid Food Hygiene Detector

Hardware of the new food hygiene detector designed in the dissertation is based on ATP (Adenosine Triphosphate) bioluminescence, with the purpose to rapidly examine the colony of food. The detector using new silicon photodiode as a photoelectric sensor, compared with traditional detectors, have the following advantages: small size, easy to operate, rapid detection. The main content of the dissertation is studied as follows: Low-cost, high precision and high sensitivity of fluorescence detection method; Weak signal processing technology; Portable low-power embedded systems technology; Embedded system hardware abstraction layer design. In the dissertation we have discussed the overall plan of the detector, described the design of these modules in detail: Power circuit, weak fluorescence detection circuit, calibration circuit, microprocessor circuit, memory circuit, LCD driver circuit, communication interface circuit and hardware drivers based on real-time operating systemμCOS-II.Experiments show: The detector detect rapidly, high precision, good repeatability, easy to operate, and be able to meet the food hygiene detect needs.