Electronic Calibrating Thermometer Environmental Stabilization
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Solution Overview
Problem
Electronic thermometers face errors in temperature readings due to rapid temperature changes and unstable environmental conditions, leading to inaccurate patient temperature measurements.
Innovation Solution
The thermometer includes a controller that executes a timer after the first temperature reading, disabling operation until a calibration timer limit is reached, allowing for environmental temperature measurements to be processed and ensuring that readings are within specified limits, thereby minimizing errors in subsequent temperature readings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the thermometer operates continuously without calibration delay, then productivity is improved, but measurement precision deteriorates due to temperature instability
Solution Approach 1:
The system performs preliminary environmental calibration before taking patient temperature measurements. The controller executes a calibration routine that measures environmental temperature and applies compensation values to subsequent patient readings, ensuring accurate measurements from the start of each measurement session.
Solution Approach 2:
The thermometer maintains continuous operation by performing rapid environmental calibration measurements that take only 1-2 seconds, then immediately proceeds to patient temperature measurement without interrupting the measurement workflow. The calibration process runs continuously in the background during patient measurement.
2Measurement precision
If a calibration timer is executed after the first temperature reading, then measurement precision is improved, but loss of time increases due to disabled operation
Solution Approach 1:
The environmental calibration process runs continuously in the background during the entire patient temperature measurement process. The controller takes environmental temperature readings at multiple time points (before, during, and after patient measurement) and applies temporal interpolation to compensate for temperature drift, eliminating the need to stop measurement for calibration.
Solution Approach 2:
The system performs rapid environmental calibration measurements that take only 1-2 seconds by taking quick temperature readings at the beginning and end of the measurement period, then interpolating the environmental temperature for the entire duration. This rushes through the calibration process without significantly extending measurement time.
3Measurement precision
If environmental temperature measurements are processed with error checking, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The controller monitors environmental temperature parameters and compares them against predefined threshold values to detect erroneous readings. When environmental temperature exceeds valid ranges or shows abnormal rate of change, the system flags the reading as erroneous and excludes it from calibration calculations, maintaining measurement accuracy through simple parameter validation.
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
This approach minimizes errors in patient temperature readings by ensuring the thermometer stabilizes in a stable environmental condition before taking subsequent measurements, providing more accurate results and preventing distortions from rapid temperature changes or undesirable environments.
Implementation Method 1
a temperature sensor configured to obtain a patient temperature reading and an environment temperature reading
Data Source
AI summary
A thermometer includes a temperature sensor, a controller configured to receive a signal from the temperature sensor, and an output configured to display a temperature determined by the controller from the signal.