Synchronous Drive Control for Chromatograph Light-Dispersing Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for synchronously driving light-dispersing elements in chromatograph detectors face challenges in maintaining a constant wavelength difference between excitation-light and fluorescence wavelengths, leading to errors and requiring additional steps, which restricts high-speed measurement, especially when the sample is flowing.
Innovation Solution
A method and system for synchronously driving light-dispersing elements by determining and transmitting specific pulse numbers to each motor, ensuring operation within their start/stop region or slew range, with a pulse transmission pattern creator adjusting rates to maintain synchronized high-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional synchronous driving methods are used to change excitation-light and fluorescence wavelengths simultaneously, then measurement speed is improved, but wavelength accuracy deteriorates due to inability to maintain constant wavelength difference
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between pulse numbers and wavelengths for each motor in a lookup table before measurement. This allows the system to quickly retrieve accurate pulse numbers corresponding to desired wavelengths without real-time calculation, maintaining both high speed and accuracy during actual measurement
Solution Approach 2:
The patent implements feedback by using the pre-stored relationship data to continuously monitor and adjust the pulse numbers sent to each motor based on the desired wavelength difference. The system feedback mechanism ensures that the wavelength difference constraint is maintained while achieving high-speed synchronous driving
2Loss of time
If trapezoidal or S-shape drive is used to reduce drive time, then measurement time is shortened, but maintaining constant wavelength difference becomes difficult requiring additional processing steps
Solution Approach 1:
The patent resolves this contradiction by pre-calculating the optimal pulse transmission patterns during system setup or preliminary measurement. The lookup table stores pre-computed pulse sequences that inherently maintain the wavelength difference constraint, eliminating the need for complex real-time control calculations during actual measurement
Solution Approach 2:
The patent applies dynamics by allowing flexible selection of different drive patterns (trapezoidal, S-shape, or other profiles) from the pre-calculated options in the lookup table. The system can dynamically choose the most appropriate drive pattern based on measurement requirements while maintaining wavelength accuracy through the pre-computed pulse sequences
3Ease of operation
If constant-speed drive is used to simplify control, then operation is easier, but measurement time increases and cannot perform measurement on flowing samples
Solution Approach 1:
The patent resolves this contradiction by pre-calculating pulse transmission patterns for various speed requirements and storing them in the lookup table. This allows the system to switch between different speed profiles (including constant-speed for simplicity or accelerated profiles for speed) without increasing control complexity, as all patterns are pre-computed
Solution Approach 2:
The patent applies parameter changes by allowing the system to select different measurement conditions (wavelength ranges, intervals, speed profiles) that are all pre-configured in the lookup table. The operator can easily change measurement parameters without dealing with complex control logic, as the system automatically retrieves the appropriate pre-calculated pulse sequences
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 simultaneous high-speed driving of light-dispersing elements, allowing for rapid fluorescent spectrum measurement even when the sample is flowing, by ensuring accurate and synchronized wavelength changes.
Implementation Method 1
an excitation-light dispersing device 11, which turns the light into a monochromatic light of a specific excitation-light wavelength by a diffraction grating 11a
Implementation Method 2
Upon being irradiated with the excitation light, the sample solution 13 emits a faint fluorescence
Data Source
AI summary
Provided is a system for synchronously driving light-dispersing elements capable of synchronously and sequentially changing an excitation-light wavelength and a fluorescence wavelength at high speeds. The system includes: a first light-dispersing unit having a first light-dispersing element and a first pulse motor; a second light-dispersing unit having a second light-dispersing element and a second pulse motor; a memory section for storing light-dispersing element information relating to a change in the wavelength of the monochromatic light and the dynamic characteristics information of the pulse motors; a drive condition setting section for allowing an operator to set synchronous drive conditions; a pulse transmission pattern creator; and a pulse transmitter.