Inverse Matrix Correction for Photodetector Crosstalk in Scanning Microscopes
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Solution Overview
Problem
In scanning microscopes, crosstalk in detection signals occurs due to differences in photodetector types and post-stage circuit configurations, leading to incorrect estimation of light incident on the photodetector, especially when photodetectors of different characteristics are used or replaced.
Innovation Solution
A light measurement device with a photodetector, A/D conversion circuit, and processor that sets and applies an optimum transformation matrix for inverse conversion of detection signals, accounting for individual differences in photodetectors and circuit configurations, to accurately estimate pulsed signal light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a semiconductor optical sensor is used as a photodetector, then cost is reduced and sensitivity is improved, but sensor reaction time becomes long causing crosstalk in the detection signal
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing a transformation matrix that accounts for the photodetector's exponential response characteristics before actual measurement. This pre-computed matrix is then used to correct the detection signal, effectively compensating for the long reaction time issue without requiring hardware changes.
Solution Approach 2:
The transformation matrix acts as an intermediary that mediates between the raw detection signal and the corrected signal. It transforms the signal by canceling out the exponential response effect, thereby eliminating crosstalk while preserving the benefits of using semiconductor optical sensors.
2Adaptability or versatility
If photodetectors of different types or configurations are used, then system adaptability is improved, but crosstalk occurs due to individual differences in photodetector characteristics
Solution Approach 1:
The patent changes the parameter approach by creating transformation matrices tailored to specific photodetector models and configurations. Each photodetector type has its own optimized transformation matrix that accounts for its unique characteristics, allowing the system to adapt to different photodetectors while maintaining high measurement precision through model-specific correction.
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 correct estimation of signal light by using an optimum transformation matrix tailored to the specific photodetector and circuit configuration, improving image reconstruction accuracy in scanning microscopes.
Implementation Method 1
a photodetector that detects pulsed signal light and outputs a detection signal
Data Source
AI summary
The light measurement device includes: a photodetector that detects pulsed signal light and outputs a detection signal including an exponential response; an A/D conversion circuit that converts the detection signal into a digital signal; and a processor that performs setting of a transformation matrix for inversely converting the digital signal, and inverse conversion of the digital signal by the set transformation matrix to calculate an estimated pulse of the signal light.