Biological Information Measurement Device Temperature Compensation
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Solution Overview
Problem
Biological information measurement devices face decreased accuracy due to fluctuations in environmental or body temperature, affecting the intensity of detection signals used to measure pulse waves and oxygen saturation concentrations.
Innovation Solution
Incorporating a temperature sensor to measure environmental and body temperatures, and a controller to adjust the light emitting intensity of the measurement device based on calculated temperature change rates, thereby stabilizing signal intensity and maintaining measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement device uses a fixed light emitting intensity, then the device structure is simple, but the measurement accuracy decreases when temperature changes
Solution Approach 1:
The light emitting intensity is changed from a fixed value to a dynamically adjustable parameter. The controller modifies the light emitting intensity based on detected temperature changes, allowing the system to adapt to environmental conditions and maintain measurement accuracy despite temperature fluctuations.
Solution Approach 2:
A feedback mechanism is introduced where the temperature sensor continuously monitors temperature changes and provides information to the controller. The controller then adjusts the light emitting intensity in response to this feedback, creating a closed-loop control system that maintains measurement accuracy under varying temperature conditions.
2Reliability
If the light emitting intensity is adjusted based on temperature changes, then the measurement accuracy is maintained, but the device complexity increases due to additional components
Solution Approach 1:
The controller performs multiple functions: it not only controls the light emitting intensity but also processes temperature data and makes adjustment decisions. This multi-functionality reduces the need for separate dedicated components for each function, thereby limiting the increase in device complexity while maintaining measurement reliability.
Solution Approach 2:
The system changes the operational parameter (light emitting intensity) in response to environmental changes (temperature). By dynamically adjusting this parameter, the system maintains measurement reliability without requiring complex hardware modifications, as the adjustment is achieved through software/control logic in the controller.
3Measurement precision
If the light emitting intensity is increased to compensate for temperature changes, then the signal intensity is maintained, but the energy consumption increases
Solution Approach 1:
The light emitting intensity is dynamically adjusted based on actual temperature changes rather than being constantly increased. The controller modifies the intensity only when and to the extent necessary to compensate for detected temperature variations, thereby maintaining signal intensity while minimizing unnecessary energy consumption.
Solution Approach 2:
The system changes the light emitting intensity parameter in response to temperature conditions. By adjusting this parameter dynamically rather than using a fixed high intensity, the system maintains adequate signal intensity for accurate measurements while reducing overall energy consumption compared to a constantly high-intensity approach.
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 solution effectively prevents decreases in measurement accuracy by dynamically adjusting light emitting intensity in response to temperature changes, ensuring consistent and reliable data collection for pulse waves and oxygen saturation concentrations.
Implementation Method 1
a light emitting unit including a light emitting element that emits light
Implementation Method 2
a temperature sensor configured to measure at least one of an environmental temperature and a body temperature of the living body and generate temperature data
Data Source
AI summary
A biological information measurement device includes: a light emitting unit including a light emitting element that emits light; a light receiving unit configured to receive the light passing through a living body and generate a detection signal; a temperature sensor configured to measure at least one of an environmental temperature and a body temperature of the living body and generate temperature data; and a controller configured to adjust a light emitting intensity of the light emitting element. The controller calculates a temperature change rate using the temperature data, and adjusts the light emitting intensity based on the temperature change rate.