Dichroic Coated Optical Sensor for Simultaneous Pressure and Blood Volume Detection
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Solution Overview
Problem
Existing methods for detecting surface pressure and blood volume are complex and difficult to miniaturize, as they require separate sensors for each measurement, which can be cumbersome and impractical for simultaneous detection.
Innovation Solution
An apparatus comprising a printed circuit board with a light emitter and receivers of different wavelengths, a transparent elastic body, and a dichroic coating that allows for simultaneous detection of surface pressure and blood volume by emitting green and orange light, which are reflected and transmitted through the skin respectively, enabling calculation of both parameters at the same skin position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate pressure sensor and blood volume sensor are used, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines pressure sensing and blood volume detection functions into a single integrated sensor device. The pressure sensor and optical sensor are merged into one unit that can simultaneously detect both surface pressure and blood volume changes at the same location, eliminating the need for separate sensors and reducing overall device complexity.
Solution Approach 2:
The integrated sensor serves multiple functions: it acts as both a pressure sensor for detecting surface pressure and an optical sensor for detecting blood volume changes. This multi-functional design allows one device to perform what previously required two separate devices, simplifying the overall system.
2Adaptability or versatility
If separate pressure sensor and blood volume sensor are used, then measurement capability is improved, but ease of operation deteriorates
Solution Approach 1:
By merging the pressure sensing and optical detection functions into a single sensor positioned at one location, the device becomes easier to operate. Users only need to apply the sensor once to the skin, and it will simultaneously measure both pressure and blood volume, eliminating the need to position multiple separate sensors at different locations.
3Ease of operation
If combined sensor for simultaneous detection is created, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The integrated sensor is constructed using layered structures and modular components, including transparent elastic bodies with embedded sensors and dichroic coatings. This segmented approach allows each component to be manufactured separately with standard precision, then assembled into the final integrated device, reducing the need for high-precision monolithic manufacturing.
4Ease of operation
If combined sensor for simultaneous detection is created, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple sensing functions into a single integrated device that can simultaneously measure pressure and blood volume. This consolidation reduces the number of separate components and connections needed, ultimately simplifying the device despite the advanced functionality.
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
Enables accurate and simultaneous detection of surface pressure and blood volume at the same skin position, improving the assessment of cardiovascular system characteristics without the need for additional pressure measuring devices, facilitating miniaturization and wearability.
Implementation Method 1
a light emitter disposed on the PCB and configured to emit light of a first wavelength and light of a second wavelength
Implementation Method 2
a dichroic coating disposed on the transparent elastic body and configured to reflect the light of the first wavelength and to transmit the light of the second wavelength
Implementation Method 3
a first light receiver and a second light receiver disposed on the PCB, the first light receiver configured to detect the light of the first wavelength and the second light receiver configured to detect light of the second wavelength
Implementation Method 4
a transparent elastic body on the PCB and covering the light emitter, the first light receiver, and the second light receiver
Data Source
AI summary
An apparatus for simultaneously detecting surface pressure and blood volume of an object and a method of detecting the same are provided. The apparatus includes a printed circuit board (PCB); a light emitter disposed on the PCB which emits light of a first wavelength and light of a second wavelength; a first light receiver which detects light of the first wavelength and a second light receiver which detects light of the second wavelength; a transparent elastic body on the PCB which covers the light emitter, the first light receiver, and the second light receiver; and a dichroic coating formed on the transparent elastic body. The dichroic coating reflects light of the first wavelength and transmits light of the second wavelength.