| 摘要 |
The perishable goods integrity indicator includes a first oscillator (11) for outputting a clock signal which does not vary in response to temperature. A second oscillator (15) outputs a second clock signal which varies as a function of temperature. A counter (19) counts the pulses of the second clock signal during a time period determined by the first clock and outputs a count value. A data table (20) receives the count value, translates the count value into a time temperature value representing the relationship of time and temperature during the time period and outputs the time temperature value to an adder (21). The adder adds the time temperature values output by the data table over time and outputs a cumulative time temperature value corresponding to shelf life for a product. An LCD displays a value corresponding to the remaining shelf life of the article. |
