Optical Detection Device With Unequal Light Periods for SpO2 Timing
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Solution Overview
Problem
Existing detection devices face challenges in minimizing the difference in detection timing between first and second detection values used to calculate blood oxygen saturation levels (SpO2), which affects the accuracy of the measurement.
Innovation Solution
The detection device employs first and second light sources with different emission periods, where the second light source has a shorter emission period than the first, allowing for synchronized detection of pulse waves and vascular images using infrared and red light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light emission periods of first and second light sources are made equal, then detection timing is simplified, but timing difference between first and second detection values increases affecting SpO2 accuracy
Solution Approach 1:
The patent applies periodic action by setting different light emission periods for the first and second light sources. The first light source emits light during a first light emission period, while the second light source emits light during a second light emission period that is shorter than the first. This periodic emission with different durations allows synchronized detection of pulse waves and vascular images at different time points, reducing timing differences in detection values used for SpO2 calculation while maintaining manageable control complexity through regular periodic operation.
2Measurement precision
If detection timing is synchronized perfectly, then SpO2 calculation accuracy improves, but it requires complex coordination of light emission and detection circuits
Solution Approach 1:
The patent applies preliminary action by controlling the second light source to emit light for a shorter duration than the first light source. This preliminary, shortened emission period of the second light source allows the detection circuit to acquire both first and second detection values within a coordinated timeframe, achieving synchronized detection timing for SpO2 calculation without requiring complex real-time coordination mechanisms during operation.
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 configuration reduces timing discrepancies, enhancing the accuracy and reliability of blood oxygen saturation level measurements by ensuring synchronized detection of pulse waves and vascular patterns.
Implementation Method 1
acquire an oxygen saturation level in blood (hereinafter, called 'blood oxygen saturation level (SpO2)') based on transcutaneous data acquired by detecting light transmitted through or reflected by arteries
Implementation Method 2
a pulse wave acquired using red light and a pulse wave acquired using infrared light are used
Data Source
AI summary
According to an aspect, a detection device includes: an optical sensor; a first light source configured to emit first light to the optical sensor; a second light source configured to emit second light different from the first light to the optical sensor; and a detection circuit configured to acquire a first detection value when the first light is emitted to the optical sensor and a second detection value when the second light is emitted to the optical sensor. A light emission period of the second light source is relatively shorter than a light emission period of the first light source.