Methods and apparatus for determining the condition of food

摘要: 1,262,749. Measuring condition of food. NATIONAL RESEARCH DEVELOPMENT CORP. Feb.19, 1970[Feb.24, 1969], No.9859/69. Heading G1N. The solid or liquid biological foods e.g. fish is determined by measuring the product CR food, Quality factor phase angle A probe, Figs.3, 4 (not shown) comprising two pairs electrodes 11, 12, 13, 14 positioned in on a sample food 10. signal developed across stainless steel when sinusoidal e.m.f. applied through resistor 20 to via high impedance F.E.T. voltage follower circuits 18, 19 differential amplifier 21. If good 10 resistive so that output comparator 22, which 21 and 90 degree delayed from zero. Deterioration increases relative permittivity hence between signals indicated meter 27 as measure In an alternative arrangement Fig.2 (now 13 are converted rectangular waveforms control current generator average D.C. representative thermistor may be connected compensate for surface temperature fish.