Sensing Apparatus Hetero-junction Light Coupler Noise Filtration
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Solution Overview
Problem
The precision of sensing apparatuses is compromised due to mismatched resistors between the sensing device and readout device, particularly when detecting elements with low concentrations, leading to difficulties in distinguishing noise from real signals.
Innovation Solution
A sensing apparatus with a hetero-junction structure, incorporating a light coupler connected to an LED and a capacitor, and a resistor connected in series with another capacitor, enhances signal processing by using an amplifier to transform current signals into voltage signals, improving signal accuracy and noise filtration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resistor of the readout device is designed to match with that of the sensing device, then the precision of the sensing apparatus is improved, but the resistor matching cannot be performed perfectly because the resistor of the sensing device varies with operating conditions
Solution Approach 1:
The patent introduces a dynamic compensation mechanism that adjusts the readout device's resistor value in real-time based on the operating conditions. The control unit monitors the sensing device's resistor variations and dynamically adjusts the readout device's resistor to maintain optimal matching across different operating points, resolving the contradiction between precision and adaptability.
Solution Approach 2:
The patent implements a feedback loop where the control unit continuously monitors the actual resistor value of the sensing device and adjusts the readout device's resistor accordingly. This feedback mechanism ensures that the resistor matching is maintained dynamically, improving measurement precision while adapting to changing operating conditions.
2Measurement precision
If the sensing device operates to detect target elements with low concentration, then the sensitivity is improved, but the noise and real signal are hard to be distinguished from each other
Solution Approach 1:
The patent introduces a light coupler as an intermediary between the sensing device and the readout device. This optical coupling mechanism isolates the electrical noise from the signal path while transmitting the sensing signal accurately. The light coupler converts electrical signals to optical signals and back, acting as a noise barrier that preserves signal integrity during low-concentration detection.
Solution Approach 2:
The patent replaces direct electrical connection with optical connection using a light coupler. This substitution eliminates electrical noise and interference in the signal path, allowing high-sensitivity detection of low-concentration target elements without noise contamination. The optical interface acts as an ideal signal transmitter that is immune to electrical interference.
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 enhances the precision of detecting target elements by stabilizing output voltage and accurately measuring concentration levels, even at low concentrations, while maintaining low power consumption.
Implementation Method 1
a light coupler having an LED connected to the sensing device
Implementation Method 2
a sensing device having a hetero-junction structure
Data Source
AI summary
A sensing apparatus includes a sensing device having a hetero-junction structure, a light coupler connected to the sensing device and a readout device connected to the light coupler.