Printed Analog Integrator for Low-Cost Perishable Goods Monitoring
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Solution Overview
Problem
Existing smart labels and packaging technologies face high costs and power consumption due to the need for complex, custom Application Specific ICs to accurately measure temperature and humidity over time, making them unsuitable for typical packaging applications.
Innovation Solution
The use of analog integration circuits fabricated directly onto polymer substrates, such as PET, using ink-jet printing methods, combined with silicon-based circuits, allows for low-cost and low-power temperature and humidity integration, with tunable components like capacitors trimmed by laser cutting for high accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If custom ASICs are used for temperature and humidity integration, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces expensive custom ASICs with inexpensive off-the-shelf components (operational amplifiers, capacitors, resistors) that can be discarded or replaced easily. The integrator circuit uses standard components rather than custom-designed integrated circuits, significantly reducing cost while maintaining sufficient measurement precision for packaging applications.
Solution Approach 2:
The integrator circuit is designed to measure both temperature and humidity integration using the same basic circuit architecture. By using a universal circuit design that can handle different environmental parameters, the patent reduces the need for multiple specialized circuits, thereby simplifying device complexity while maintaining measurement capabilities.
2Device complexity
If off-the-shelf chip resistors and capacitors are used, then device complexity is reduced, but measurement precision deteriorates due to tolerance problems
Solution Approach 1:
The patent addresses component tolerance issues by changing the measurement approach from relying on precise component values to measuring the integral of environmental conditions over time. The integrator circuit accumulates sensor signals, and the measurement is taken at the end of a defined integration period, which reduces the impact of component tolerances on final measurement accuracy.
Solution Approach 2:
The system incorporates a control module that monitors the integrator output and can adjust integration parameters or trigger measurements at optimal times. This feedback mechanism compensates for variations in component values by dynamically adapting the measurement process to maintain precision despite using off-the-shelf components.
3Device complexity
If analog integration circuits are used for long-term measurements, then device complexity is reduced, but reliability deteriorates due to drift and loss of accuracy
Solution Approach 1:
The patent implements periodic resetting of the integrator circuit at defined measurement intervals. By periodically clearing the integration accumulator and starting fresh measurements, the system prevents long-term drift accumulation and maintains reliability over extended operation periods, while still using simple analog circuitry for the integration process.
Solution Approach 2:
The system performs preliminary calibration or initialization of the integrator circuit before actual measurements begin. This preliminary action establishes baseline values and prepares the circuit for accurate long-term operation, reducing drift effects by establishing known reference points before the measurement period starts.
4Measurement precision
If high-grade conductors and precision components are used, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs inexpensive off-the-shelf operational amplifiers, capacitors, and resistors instead of high-grade precision components. The design accepts that individual components may have tolerances, but the overall system achieves sufficient precision through the integration methodology and periodic measurement approach, significantly reducing manufacturing cost.
Solution Approach 2:
The patent changes the measurement parameter from instantaneous readings (which require high-precision components) to time-integrated values. This parameter transformation allows the use of lower-precision components while maintaining measurement accuracy, as the integration process averages out component variations and tolerances over the measurement period.
Data Source
AI summary
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.