System and method for monitoring environmental conditions
First Claim
1. A system for monitoring environmental conditions of a perishable product, the system comprising:
- an environmental sensor configured to sense one or more environmental conditions of the perishable product;
an analog integrator in communication with the environmental sensor, the analog integrator being formed on a polymer substrate and including one or more tunable components;
a comparator in communication with the analog integrator and configured to change state when an output of the analog integrator reaches a selected threshold level; and
a control module in communication with the comparator and the analog integrator, wherein the control module is configured to control the operation of the analog integrator based on an output of the comparator.
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Abstract
A system and method are disclosed for monitoring environmental conditions of a perishable product. The system includes an environmental sensor configured to sense one or more environmental conditions of the perishable product and an analog integrator in communication with the environmental sensor, the analog integrator being formed on a polymer substrate and including one or more tunable components. The system also includes a comparator in communication with the analog integrator and configured to change state when an output of the analog integrator reaches a selected threshold level, and a control module in communication with the comparator and the analog integrator. The control module is configured to control the operation of the analog integrator based on an output of the comparator.
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Citations
28 Claims
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1. A system for monitoring environmental conditions of a perishable product, the system comprising:
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an environmental sensor configured to sense one or more environmental conditions of the perishable product;
an analog integrator in communication with the environmental sensor, the analog integrator being formed on a polymer substrate and including one or more tunable components;
a comparator in communication with the analog integrator and configured to change state when an output of the analog integrator reaches a selected threshold level; and
a control module in communication with the comparator and the analog integrator, wherein the control module is configured to control the operation of the analog integrator based on an output of the comparator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system comprising:
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a humidity sensor coupled to a first analog integrator;
a temperature sensor coupled to a second analog integrator;
a first comparator coupled to the first analog integrator;
a second comparator coupled to the second analog integrator;
an analog-to-digital converter coupled to the humidity sensor and the temperature sensor; and
a control module coupled to the first and second analog integrators, the first and second comparators, and the analog-to-digital converter. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method of tuning a system for monitoring environmental conditions of a perishable product, the method comprising:
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fabricating a capacitor comprising a first capacitive plate formed on an upper surface of a polymer substrate and a second capacitive plate formed on a lower surface of the polymer substrate, the first and second capacitive plates comprising a capacitive plate material;
removing capacitive plate material while measuring the capacitance of the capacitor until a selected capacitance is reached; and
incorporating the capacitor into an analog integrator circuit configured to receive an input signal from an environmental sensor capable of monitoring one or more environmental conditions of the perishable product. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification