Confocal Microscope Automatic Focus Detection via Dynamic Gain Control
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Solution Overview
Problem
In confocal microscopes, achieving precise focus on a desired region of an observing object is challenging due to signal saturation at high gain settings and noise interference at low gain settings, making manual adjustment of the stage and gain necessary to detect focus peaks in pixel data.
Innovation Solution
A microscope system that automatically detects the focus position by calculating evaluation values from pixel data across multiple positions, adjusting sensitivity parameters to maintain values within defined limits, and correcting these values to identify peak positions, thereby setting appropriate sensitivity and focusing the optical system on the desired region without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gain of the light receiving element is increased to improve signal strength, then the output signal saturates and peak detection becomes impossible
Solution Approach 1:
The gain of the light receiving element is dynamically adjusted based on the detected signal level. The system automatically increases or decreases the gain to maintain the output signal within a detectable range, preventing saturation while ensuring sufficient signal strength for accurate peak detection.
Solution Approach 2:
The system employs feedback control by continuously monitoring the output signal of the light receiving element and adjusting the gain accordingly. When the signal approaches saturation, the gain is reduced; when the signal is too weak, the gain is increased, creating a closed-loop control system that maintains optimal detection conditions.
2Reliability
If the gain of the light receiving element is decreased to avoid signal saturation, then the peak in pixel data cannot be identified from noise
Solution Approach 1:
The gain is dynamically adjusted based on real-time signal conditions rather than being fixed. This allows the system to optimize the signal-to-noise ratio by increasing gain when signals are weak but avoiding saturation when signals are strong, thereby maintaining peak detection accuracy across varying conditions.
Solution Approach 2:
The feedback mechanism monitors the output signal level and automatically adjusts the gain to maintain optimal detection conditions. This ensures that the peak in pixel data remains distinguishable from noise by keeping the signal within an appropriate dynamic range.
3Measurement precision
If manual adjustment of stage and gain is required to achieve proper focus, then user effort increases and operation becomes time-consuming
Solution Approach 1:
The system performs automatic focus detection and gain adjustment without requiring manual intervention. The control unit automatically analyzes the pixel data to detect focus peaks and adjusts the stage position and gain accordingly, making the system self-sufficient and eliminating repetitive manual operations.
Solution Approach 2:
The patent replaces manual mechanical adjustment with an automated control system that uses electronic feedback to detect focus conditions and adjust parameters. This substitution of mechanical manual operation with electronic automation reduces user effort while maintaining or improving focus accuracy.
4Measurement precision
If repeated manual adjustment of stage and gain is performed, then time is wasted but focus may still be difficult to achieve
Solution Approach 1:
The system automatically performs focus detection and parameter optimization without requiring repeated manual adjustments. The control unit continuously monitors pixel data and autonomously adjusts the stage and gain to achieve optimal focus, eliminating time-wasting repetitive operations.
Solution Approach 2:
The feedback control system continuously monitors the focus condition through pixel data analysis and makes real-time adjustments to maintain optimal focus. This eliminates the need for repeated manual trial-and-error adjustments by providing continuous automatic 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
The system accurately detects focus positions and sets optimal sensitivity parameters, enabling automatic and precise focusing on the desired region of the observing object, reducing user effort and improving focus accuracy.
Implementation Method 1
The reflected light from the measuring target is collected by a light receiving lens, and entered to a light receiving element through a pin hole
Implementation Method 2
an optical system for irradiating the light emitted from the light source on the observing target while collecting the light, and guiding the light irradiated on the observing target to the light receiving element
Data Source
AI summary
To provide a microscope system capable of automatically detecting a position of a focus of an optical system relative to an observing object. A light emitted from a laser light source is irradiated on an observing object, and the light reflected by the observing object is guided to a light receiving element. An evaluation value based on a plurality of pixel data is set so as to be smaller than an output upper limit value Emax and greater than a multiplication value En1 of a noise level. The evaluation value is calculated with the set gain while moving the objective lens in an upward direction from a current position zs1. The gain is reduced by a constant amount every time the evaluation value reaches the output upper limit value Emax. The position in the Z direction of the objective lens when the evaluation value becomes a peak is detected.