Wireless Data Logger Dual-Sensor Drift Detection for Shipment Temperature
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Solution Overview
Problem
Existing data loggers used for monitoring environmental parameters, such as temperature, suffer from inaccuracies due to sensor drift or shift, which are difficult to detect during use, leading to costly and time-consuming recalibration processes.
Innovation Solution
A wireless data logger with two temperature sensors, one inside and one outside the housing, compares measurements to automatically identify deviations exceeding a predefined limit, triggering a recalibration request, ensuring accurate temperature monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single temperature sensor is used in the data logger, then the device complexity is reduced, but the measurement precision and reliability deteriorate due to undetected sensor drift
Solution Approach 1:
The patent applies the copying principle by introducing a second temperature sensor that replicates the function of the first sensor. This copy allows for cross-validation and detection of drift without requiring complex calibration procedures, thereby maintaining measurement precision while avoiding excessive complexity
Solution Approach 2:
The system implements feedback by continuously comparing the readings from the first and second temperature sensors. When a deviation exceeding a predefined limit is detected, the system triggers a recalibration request, creating a closed-loop feedback mechanism that maintains measurement accuracy over time
2Measurement precision
If temperature sensors are calibrated frequently to maintain accuracy, then the measurement precision is improved, but the loss of time and productivity increase due to recalibration requirements
Solution Approach 1:
The patent applies preliminary action by having the second temperature sensor continuously monitor the environment and detect drift conditions before they affect measurement accuracy. This allows for proactive recalibration scheduling, preventing accuracy degradation while minimizing disruption to operations
Solution Approach 2:
The feedback mechanism compares real-time readings from both sensors and automatically triggers recalibration only when necessary, based on detected deviations. This eliminates unnecessary frequent recalibrations while maintaining precision when needed, thereby reducing time loss
3Productivity
If the communication module remains continuously on to ensure data transmission, then the productivity is improved, but the temperature measurement accuracy deteriorates due to heat generation
Solution Approach 1:
The patent applies periodic action by implementing a duty-cycling mechanism where the communication module is activated only during specific transmission windows rather than continuously. This allows the system to maintain productivity through periodic data transmission while minimizing heat generation that would interfere with temperature measurements
Solution Approach 2:
The system segments the operational cycle into distinct phases: data collection phase (with communication module off for accurate measurement) and data transmission phase (with communication module on for productivity). This segmentation allows both requirements to be satisfied without compromise
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dual-sensor system provides reliable and accurate temperature measurement by detecting sensor drift, preventing false data transmission and reducing the need for frequent recalibration, thereby enhancing data integrity and operational efficiency.
Implementation Method 1
a first temperature sensor configured for regularly measuring a first temperature of the shipment
Implementation Method 2
a second temperature sensor configured for regularly measuring a second temperature of the shipment
Implementation Method 3
comparing the first temperature data from the first temperature sensor measured within the housing with the second temperature data from the second temperature sensor measured outside and adjacent to the outer side of the housing
Data Source
AI summary
A wireless data logger, a method and a system for operating such a data logger, where the data logger is configured to monitor at least one environmental parameter of a shipment at least during transport of the shipment from an origin location to destination location, includes: a power source for powering the wireless data logger, a first sensing device configured for regularly measuring an environmental related parameter, a second sensing device configured for regularly measuring said environmental related parameter, a processor, and a communication module operated by the processor configured to transmit the at least one environmental parameter to an external data processing device. The measurement data from the first and the second sensing devices are processed by a processing device where the processing includes: comparing the measurement data from the first sensing device with the measurement data from the second sensing device.