Dynamic Lock-in Bandwidth Controller for SRS Microscopy
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Solution Overview
Problem
Existing SRS microscopy systems face challenges in maintaining optimal image quality due to fixed lock-in detection bandwidth, which deteriorates when image acquisition parameters such as pixel dwell-time, laser-scan speed, or objective magnification are changed, leading to variations in signal-to-noise ratio.
Innovation Solution
An automatic adaptable lock-in detection bandwidth controller adjusts the lock-in amplifier's bandwidth based on current microscope settings, such as pixel dwell-time, laser-scan speed, and objective magnification, to maintain optimal imaging quality across varying parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed lock-in detection bandwidth is used in SRS microscopy, then the system structure remains simple, but the image quality deteriorates when acquisition parameters such as pixel dwell-time, laser-scan speed, or objective magnification are changed
Solution Approach 1:
The patent implements dynamic adjustment of the lock-in detection bandwidth by linking it to the pixel dwell-time parameter. The bandwidth is calculated as a function of dwell-time (typically bandwidth ∝ 1/dwell-time), allowing the system to adapt to changing acquisition conditions automatically. This dynamic approach maintains optimal signal-to-noise ratio across varying scan speeds and magnifications without requiring complex manual recalibration.
Solution Approach 2:
The system incorporates feedback mechanisms where the lock-in bandwidth is continuously adjusted based on real-time acquisition parameters. The controller monitors pixel dwell-time and automatically modifies the bandwidth setting to maintain optimal detection conditions, creating a closed-loop system that preserves image quality throughout the imaging process.
2Measurement precision
If the lock-in bandwidth is adjusted to maintain optimal signal-to-noise ratio for fast scanning, then the signal-to-noise ratio improves, but the bandwidth must be increased which may allow more noise to pass through
Solution Approach 1:
The patent employs parameter changes by dynamically modifying the lock-in bandwidth based on the pixel dwell-time. The bandwidth is set proportional to the inverse of dwell-time (bandwidth ∝ 1/dwell-time), which optimizes the signal-to-noise ratio for each specific acquisition condition. This parameter adjustment ensures that the detection bandwidth matches the signal characteristics without excessively broadening the bandwidth and admitting unnecessary noise.
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 solution ensures a high-quality image with improved signal-to-noise ratio by dynamically adjusting the lock-in bandwidth to match changing microscope settings, preventing deterioration in image quality.
Implementation Method 1
a lock-in amplifier/mixer; the SRS signal is demodulated using the R drive frequency of the modulator 3 as the local oscillator
Implementation Method 2
an AOM (acousto-optic modulator) or EOM (electro-optic modulator)
Implementation Method 3
an AOM (acousto-optic modulator) or EOM (electro-optic modulator)
Implementation Method 4
stimulated Raman scattering (SRS) imaging... two pulsed (with frequencies ranging typically from 1-100 MHz) optical fields with pulse widths ranging from 100 fs-20 ps of different wavelengths routed through a confocal microscope system
Data Source
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AI summary
The present invention relates to an electric circuit for a microscope (20) comprising a lock-in amplifier (300), wherein the lock-in amplifier (300) comprises an input for an input signal (s), an input for a reference signal (r), an output for an output signal (o), and a bandwidth filter device (302), wherein the bandwidth filter device (302) is adapted such that a low bandwidth frequency value and/or a high bandwidth frequency value is variably settable, wherein the electric circuit comprises a dynamic bandwidth controller unit (500) into which at least one parameter (P) of a current setting of the microscope (20) is input, wherein the dynamic bandwidth controller unit (500) is adapted to control the low bandwidth frequency value and/or the high bandwidth frequency value of the lock-in amplifier (300) as a function of the at least one parameter (P) of a current setting of the microscope (20).