Biological Detection Device with Periodic Light Path Control
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Solution Overview
Problem
Existing biological measurement technologies face errors due to variations in tissue thickness and types through which light passes, leading to inaccuracies in calculating biological information such as oxygen saturation.
Innovation Solution
A detection device that emits light for alternating periods along different paths within a measurement area, generating detection signals to compensate for tissue differences by controlling the duration of these periods, allowing for precise measurement of biological information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is emitted continuously through the measurement part, then sufficient light signal is obtained for measurement, but the steady component values in detection signals become different due to varying tissue types and thicknesses, causing measurement errors
Solution Approach 1:
The patent applies periodic action by emitting light alternately through first and second paths in repeated periods, rather than continuously. The control unit controls the light emitting unit to emit light through the first path in a first period and through the second path in a second period, which are alternately repeated. This periodic switching allows the steady component values to be equalized while maintaining sufficient light signal for measurement.
2Measurement precision
If different light paths are used to compensate for tissue variations, then measurement precision improves, but the detection device complexity increases due to multiple light-emitting elements and control mechanisms
Solution Approach 1:
The patent merges multiple light-emitting elements (first and second light-emitting elements emitting different wavelengths) into a single integrated light emitting unit. The control unit controls both elements through a unified periodic switching mechanism, managing them as one functional unit rather than separate systems, thereby reducing overall device complexity while maintaining measurement precision.
Solution Approach 2:
The light emitting unit is designed with multi-functionality, capable of emitting light through multiple paths (first path via first light-emitting element, second path via second light-emitting element) and at multiple wavelengths. This universal design allows a single unit to perform multiple measurement functions, reducing the need for separate dedicated components for each wavelength or path.
3Measurement precision
If light emission intensity is increased to improve signal quality, then detection precision improves, but safety concerns arise from excessive light exposure to the user
Solution Approach 1:
The patent uses periodic action to emit light only during specific time windows (first period and second period) rather than continuously. This time-multiplexed approach allows sufficient light signal to be obtained during the active periods while reducing overall light exposure to safe levels, thereby improving signal quality without compromising safety.
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 enables high-precision measurement of biological information by ensuring that component values of steady components in detection signals are closer to each other, reducing errors caused by varying tissue types and improving safety by avoiding excessive light intensity.
Implementation Method 1
a sensor including an LED and two photodiodes is fixed with a finger interposed therebetween... generates a first detection signal according to a light reception level of light emitted from the light-emitting unit... and a second detection signal according to a light reception level
Data Source
AI summary
A detection device generating first and second detection signals includes: a light-emitting unit that emits light to a measurement part for each of first and second periods repeated on a time axis; a signal generation unit that generates the first detection signal according to a light reception level of the light emitted from the light-emitting unit for each first period and passing along a first path inside the measurement part and the second detection signal according to a light reception level of the light emitted from the light-emitting unit for each second period and passing along a second path different from the first path inside the measurement part; and a control unit that controls a duration of at least one of the first and second periods so that component values of steady components included in the first and second detection signals are closer to each other.