Curved Biological Sensor Substrate for Higher SNR Sensing
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Solution Overview
Problem
Existing biological sensors with large sensor substrates face interference with curved surfaces, leading to widened intervals from the human body, worsening the signal-to-noise ratio and increasing power consumption when increasing emission light.
Innovation Solution
A biological sensor design with a housing featuring a protuberant curved surface and a substrate with a first portion protruding farther than a second portion, allowing the light emitter and receiver to be closely positioned to the body, and a recessed opposite surface to accommodate components, enhancing signal-to-noise ratio and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large sensor substrate is used, then the substrate area is increased, but the interval between the sensor substrate and the human body is widened, worsening the signal-to-noise ratio
Solution Approach 1:
The substrate is designed with a curved surface that matches the curvature of the human body, allowing the substrate to conform to the body surface. This curvature enables the substrate to maintain close proximity to the body while accommodating a larger overall area, thus improving the signal-to-noise ratio while utilizing a larger substrate area for component placement.
2Area of stationary object
If the interval between the sensor substrate and the human body is increased, then the substrate can be made larger, but the signal-to-noise ratio of the biological signal deteriorates
Solution Approach 1:
The curved surface design allows the substrate to wrap around or conform to the body contour, maintaining a consistently small distance between the sensor elements and the body surface across the entire substrate area. This enables large substrate area without increasing the interval to the body.
3Measurement precision
If the amount of emission light from the light-emitting portion is increased, then the signal-to-noise ratio is improved, but the power consumption is increased
Solution Approach 1:
The curved substrate design enables more efficient light collection and guidance toward the photodetector, improving the optical path efficiency. This allows for reduced emission light intensity while maintaining adequate signal-to-noise ratio, thereby reducing power consumption.
4Ease of manufacture
If the sensor substrate is made entirely flat, then the manufacturing is simplified, but the substrate interferes with the curved surface region and cannot be brought close to the human body
Solution Approach 1:
The substrate is designed with a curved surface that matches the curvature of the human body, allowing the substrate to conform to the body surface. This curvature enables the substrate to maintain close proximity to the body while accommodating a larger overall area, thus improving the signal-to-noise ratio while utilizing a larger substrate area for component placement.
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 design enables a larger substrate area while maintaining close proximity to the body, improving signal-to-noise ratio and reducing power consumption, while allowing for increased component mounting and rigidity.
Implementation Method 1
a light emitter and a light receiver... configured to emit light and receive light, respectively
Implementation Method 2
A biological detector is provided on a surface of the first portion orthogonal or substantially orthogonal to the first direction
Data Source
AI summary
A biological sensor includes a housing including a protuberant curved surface bulging in a first direction, and a substrate inside the housing and to be used with the first direction of the housing directed toward a living body. The substrate includes first and second portions at mutually different positions in the first direction and a jutting portion between the first and second portions such that the first portion protrudes farther in the first direction than the second portion. A biological detector is provided on a surface of the first portion orthogonal or substantially orthogonal to the first direction.