Optical Sensor Hydration Measurement Multi-Wavelength Calibration
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Solution Overview
Problem
Existing optical sensor devices face challenges in accurately measuring hydration levels of objects, particularly skin hydration, due to variations in water absorption coefficients at different wavelengths and environmental factors like temperature, leading to inconsistent results.
Innovation Solution
An optical sensor device that emits light at two distinct short-wavelength infrared wavelengths, receives reflected light, and uses a calibration mechanism to compensate for temperature variations and calibrate signal strengths, employing a curve fitting method to determine hydration levels based on signal strengths at these wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical sensor devices use single wavelength light for hydration measurement, then the device structure is simple, but measurement precision is poor due to variations in water absorption coefficients and environmental factors
Solution Approach 1:
The optical sensor device segments the light source into multiple wavelengths (first wavelength and second wavelength) to measure hydration levels. By using multiple wavelengths instead of a single wavelength, the device can compensate for variations in water absorption coefficients and environmental factors, thereby improving measurement precision while maintaining reasonable device complexity through systematic multi-wavelength measurement approach
Solution Approach 2:
The invention changes the parameter of light wavelength from single to multiple wavelengths. By emitting light at different wavelengths and measuring the reflected light characteristics, the system can determine hydration levels more accurately by analyzing the differential absorption and reflection patterns at each wavelength, thus resolving the contradiction between measurement precision and device complexity
2Measurement precision
If optical sensor devices do not use calibration mechanism, then the device structure is simple, but measurement precision deteriorates due to temperature variations and environmental factors
Solution Approach 1:
The optical sensor device performs preliminary calibration by obtaining reference signal strengths at multiple wavelengths when no object is present. This preliminary action establishes a baseline that compensates for environmental factors and temperature variations, allowing the device to maintain high measurement precision without requiring complex real-time calibration mechanisms during actual measurement
Solution Approach 2:
The system uses feedback from the reference signal strengths obtained during calibration to adjust and improve measurement accuracy. By comparing the reference signals with actual measurement signals, the device can compensate for environmental variations and maintain precise hydration level measurements, effectively managing the trade-off between precision and complexity
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 device provides accurate and consistent hydration level measurements by minimizing the impact of environmental factors and wavelength-specific water absorption, ensuring precise hydration information without requiring prior knowledge of the object's optical properties.
Implementation Method 1
a light-receiving element configured to receive a first reflected light at the first wavelength and a second reflected light at the second wavelength from the object
Implementation Method 2
an absorption coefficient of water at the second wavelength is higher than that at the first wavelength
Data Source
AI summary
An optical sensor device for determining a hydration level information of an object includes a light-emitting element, a light-receiving element, and an analyzer. The light-emitting element is configured to emit a first light at a first wavelength and a second light at a second wavelength. The light-receiving element is configured to receive a first reflected light at the first wavelength and a second reflected light at the second wavelength from the object. The analyzer is configured to perform a hydration measurement to determine the hydration level information. The hydration level information is based on: a first reference signal strength at the first wavelength and a second reference signal strength at the second wavelength obtained from the light-receiving element when the object is not present; and a first signal strength of the first reflected light and a second signal strength of the second reflected light when the object is present.