Reflective Optical Sensor Module for Compact Multi-Parameter Sensing
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Solution Overview
Problem
Existing optical sensor modules face challenges in combining multiple sensors into a compact form factor for precise multi-parameter measurements, particularly in placing multiple probes at the same location and increasing the form factor, which hinders their application in various fields.
Innovation Solution
A dual sensor module design that integrates both optical and electrical sensing capabilities within a single compact package, utilizing a light source, photodetector, encapsulants, and a partition on a substrate, with advanced encapsulant configurations such as multiple refractive index layers and microstructures to enhance light extraction and reception efficiency, and a cover for improved durability and signal consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple independent sensors are combined into a single device for multi-parameter measurement, then measurement capability is improved, but device form factor increases tremendously
Solution Approach 1:
The patent combines optical and electrical sensing capabilities into a single integrated sensor module, merging two independent sensing functions into one compact device. The optical sensor (with light source and photodetector) and electrical sensor are integrated on the same substrate, allowing simultaneous multi-parameter measurement without requiring separate probe placements.
Solution Approach 2:
The sensor module is designed to perform multiple sensing functions simultaneously - both optical measurements (light reflection, transmission) and electrical measurements (conductivity, impedance) can be conducted through the same device structure, making it a universal sensing platform for diverse applications.
2Measurement precision
If multiple probes are placed at the same location for precise measurement, then measurement precision is improved, but placement difficulty increases
Solution Approach 1:
The patent integrates multiple sensing functions (optical and electrical) into a single probe tip, eliminating the need to place multiple separate probes at the same location. The unified structure ensures that all measurements are taken from the exact same spatial point, maximizing measurement precision while simplifying the operation to placing just one probe.
3Reliability
If encapsulants with multiple refractive index layers are used, then light extraction efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent modifies the refractive index parameter of the encapsulant material by incorporating multiple layers with different refractive indices. This parameter change optimizes light extraction efficiency by reducing total internal reflection at the encapsulant-air interface, allowing more light to escape and reach the photodetector.
Solution Approach 2:
The encapsulant is constructed as a composite structure with multiple layers of materials having different refractive indices. This composite design creates optimal optical conditions for light extraction while maintaining a manageable manufacturing process through sequential deposition or lamination techniques.
4Reliability
If microstructures are added to encapsulants, then light reception efficiency is improved, but device complexity increases
Solution Approach 1:
The patent incorporates curved or domed microstructures on the encapsulant surface, which help to focus and direct incident light toward the photodetector. The curved geometry naturally guides light rays through refraction, improving light reception efficiency without requiring complex internal optical components.
Solution Approach 2:
The microstructures on the encapsulant may incorporate wavelength-selective properties or surface treatments that optimize light reception for specific wavelength ranges, enhancing the sensor's ability to detect particular types of light while maintaining relatively simple overall device architecture.
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 dual sensor module achieves efficient light extraction and reception, reducing stray light and enhancing signal strength, allowing for precise multi-parameter measurements in a compact form, suitable for diverse applications.
Implementation Method 1
an optical sensor module comprises a light source, a first encapsulant over the light source, a photodetector, and a second encapsulant over the photodetector
Implementation Method 2
The reflective optical sensor module emits light and measures the amount of reflected light from an object
Data Source
Figure 1A~1B
Figure 2A~3C
Figure 4A~5C
AI summary
The present disclosure relates to a reflective optical sensor module, an optical sensing accessory, and an optical sensing device. A reflective optical sensor module comprises a light source (110) and a first encapsulant (111), a photodetector (120) and a second encapsulant (121), an electrode (170) and a substrate (140). The light source (110) is configured to convert electric power into radiant energy and to emit light to an object surface. The photodetector (120) is configured to receive the light from an object surface and to convert radiant energy into electrical current or voltage. The electrode (170) is configured to detect an external circuit formed by the contact with an object surface. The optical sensing accessory and the optical sensing device comprise the reflective optical sensor module and other electronic modules to have further applications.