Dual-Channel AOM Control Circuit for Precise Mobility Measurement
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Solution Overview
Problem
Current technologies face challenges in accurately measuring electrophoretic mobility due to inter-channel drive coupling issues in acousto-optic modulators, requiring a circuit to control these modulators for precise frequency shifting and low cross-talk between channels.
Innovation Solution
A circuit comprising at least two channel amplifier circuits, a radio frequency generator, and a synchronized data acquisition system, where one channel amplifier circuit drives one acousto-optic modulator and the other drives another, with a synchronized data acquisition system digitizing optical signals from a photo diode to measure electrophoretic mobility, while minimizing zero-order peak interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single channel amplifier circuit drives both acousto-optic modulators, then device complexity is reduced, but cross-talk between channels increases and measurement precision deteriorates
Solution Approach 1:
The patent divides the single channel amplifier circuit into two separate channel amplifier circuits, with each amplifier dedicated to driving one acousto-optic modulator. This segmentation eliminates cross-talk between channels by providing independent drive paths, thereby improving measurement precision without significantly increasing overall system complexity.
2Device complexity
If frequency shifting is performed without precise control, then device simplicity is maintained, but zero-order peak interference increases and measurement precision deteriorates
Solution Approach 1:
The patent implements a synchronized data acquisition system that digitizes optical signals from photodiodes and provides feedback control for frequency shifting. This feedback mechanism precisely controls the frequency shift applied to each channel, eliminating zero-order peak interference while maintaining manageable control circuit complexity through automated synchronization.
3Device complexity
If noise floor is not reduced, then device simplicity is maintained, but sensitivity deteriorates and measurement precision worsens
Solution Approach 1:
The patent extracts and eliminates the zero-order peak interference component from the optical signal through separate channel processing. By removing this dominant noise source through dedicated channel amplifiers and synchronized detection, the system achieves a reduced noise floor and improved sensitivity without requiring complex additional signal processing.
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 circuit effectively eliminates significant zero-order peak interference, achieving stable frequency shifting and improved sensitivity in measuring electrophoretic mobility with reduced noise floor and enhanced sensitivity.
Implementation Method 1
at least two acousto-optic modulators and the photo diode are to measure electrophoretic mobility of a sample
Implementation Method 2
digitize an optical signal from a photo diode logically coupled to at least two acousto-optic modulators
Data Source
AI summary
The present disclosure describes a circuit to control acousto-optic modulators for measuring electrophoretic mobility. In an embodiment, the circuit includes at least two channel amplifier circuits, a radio frequency generator logically coupled to the channel amplifier circuits, where the radio frequency generator is to output drive signals to the channel amplifier circuits, a synchronized data acquisition system logically coupled to the radio frequency generator, where the synchronized data acquisition system is to digitize an optical signal from a photo diode logically coupled to at least two acousto-optic modulators, and where one of the channel amplifier circuits is to drive one of acousto-optic modulators and the other of the channel amplifier circuits is to drive the other of the acousto-optic modulators, where the acousto-optic modulators and photo diode are to measure electrophoretic mobility of a sample.