Particle Isolation Droplet Frequency Control Under Temperature Drift
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Solution Overview
Problem
Existing technologies for maintaining a constant side-stream trajectory and stabilizing droplets in flow cytometry are insufficient, particularly due to variations in environmental temperature affecting droplet break-off timing and flow velocity.
Innovation Solution
A particle isolation device and method that includes a vibration unit applying multiple frequencies, an imaging unit for droplet observation, a liquid temperature control unit, and a frequency control unit to adjust driving voltage based on droplet state data, ensuring stable droplet formation and trajectory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driving voltage frequency is fixed, then the device operation is simple, but droplet stability deteriorates when liquid temperature varies
Solution Approach 1:
The patent implements dynamic frequency adjustment of the driving voltage based on liquid temperature. The frequency control unit changes the driving voltage frequency according to the liquid temperature detected by the temperature sensor, making the system adaptive rather than fixed. This resolves the contradiction by allowing simple operation (automatic adjustment) while maintaining droplet stability across temperature variations.
Solution Approach 2:
The patent establishes a feedback control loop where the temperature sensor detects liquid temperature, the control unit processes this information, and the frequency control unit adjusts the driving voltage frequency accordingly. This feedback mechanism ensures droplet stability is maintained despite temperature changes, while keeping the operation simple through automatic control.
2Stability of the object's composition
If the driving voltage frequency is adjusted dynamically, then droplet stability improves, but device complexity increases
Solution Approach 1:
The patent uses a feedback control system with a temperature sensor, control unit, and frequency control unit to automatically adjust driving voltage frequency. This automated feedback mechanism improves droplet stability while minimizing the increase in device complexity by using standard control components rather than complex mechanical adjustment systems.
Solution Approach 2:
The patent replaces potential mechanical frequency adjustment mechanisms with an electronic control system. The frequency control unit electronically adjusts the driving voltage frequency based on temperature feedback, which is simpler and more reliable than mechanical adjustment systems would be.
3Loss of energy
If liquid temperature is not controlled, then energy consumption is lower, but droplet stability deteriorates
Solution Approach 1:
Instead of actively controlling liquid temperature (which would require heating/cooling systems and high energy consumption), the patent uses a feedback system that detects temperature changes and compensates by adjusting driving voltage frequency. This approach maintains droplet stability while avoiding the high energy costs of active temperature control.
Solution Approach 2:
The patent changes the driving voltage frequency parameter in response to temperature changes, rather than controlling the temperature itself. This parameter substitution allows the system to compensate for temperature variations without the energy-intensive process of maintaining constant temperature, thus preserving droplet stability while minimizing energy consumption.
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 solution provides precise droplet control with minimal temporal variation, maintaining a consistent side-stream trajectory and enhancing droplet stability despite environmental temperature changes.
Implementation Method 1
a vibration unit that applies vibration to a fluid containing sheath liquid by supplying a driving voltage based on each of a plurality of frequencies
Implementation Method 2
a liquid temperature control unit that controls a liquid temperature of the sheath liquid
Implementation Method 3
a frequency control unit that acquires data regarding a state of the droplet at each of the frequencies per liquid temperature of the sheath liquid from the image captured by the imaging unit, and controls the frequency of the driving voltage on the basis of a variation in the data accompanying a change in the liquid temperature of the sheath liquid
Data Source
AI summary
To provide a technology capable of stabilizing droplets.Provided is a particle isolation device or the like including: a vibration unit that applies vibration to a fluid containing sheath liquid by supplying a driving voltage based on each of a plurality of frequencies; an imaging unit that acquires, at a position where the fluid is formed into droplets through the vibration, an image of the fluid and each of the droplets; a liquid temperature control unit that controls a liquid temperature of the sheath liquid; and a frequency control unit that acquires data regarding a state of the droplet at each of the frequencies per liquid temperature of the sheath liquid from the image captured by the imaging unit, and controls the frequency of the driving voltage on the basis of a variation in the data accompanying a change in the liquid temperature of the sheath liquid.