Light Detector Cooling Pump Control for Low-Vibration Detection
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Solution Overview
Problem
Liquid-cooling type cooling mechanisms for light detectors suffer from pulsation-induced vibration that affects detection accuracy due to changes in detection conditions during light detection, leading to reduced S/N ratio and detection reliability.
Innovation Solution
A light detecting device with a control unit that adjusts the drive power of the pump and coolant flow during detection and standby periods, utilizing the heat capacity of the coolant to maintain cooling while minimizing vibration, supplemented by an electronic cooler and fan control to stabilize temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pump operates at high power to maintain cooling during detection, then the cooling effect is improved, but vibration from pulsation increases and deteriorates detection accuracy
Solution Approach 1:
The pump operates in a periodic cycle: high power during standby periods to establish strong cooling, then low power or stopped during detection periods to minimize vibration. This periodic switching resolves the contradiction by providing cooling when needed while eliminating vibration during sensitive measurements.
Solution Approach 2:
The pump performs preliminary cooling action during standby periods before detection begins. By pre-cooling the light detector to the target temperature during standby, the pump can then be stopped or reduced during detection, maintaining the cooling effect without introducing vibration.
2Measurement precision
If the pump is stopped during detection to eliminate vibration, then detection accuracy is improved, but the cooling effect may deteriorate due to temperature rise
Solution Approach 1:
The pump performs preliminary cooling during standby periods to bring the light detector to the target temperature before detection starts. This pre-cooling action ensures the detector remains at the desired temperature even when the pump is stopped during detection, preventing temperature rise without vibration.
Solution Approach 2:
The cooling action is made continuous across standby and detection periods through thermal inertia. The coolant circulating in the heat exchanger maintains cooling during detection even when the pump is stopped, as the coolant retains coldness from previous circulation, ensuring continuous temperature control without vibration.
3Temperature
If the coolant flow rate is increased to improve cooling efficiency, then temperature control is improved, but pulsation and vibration increase
Solution Approach 1:
The coolant flow rate is varied periodically: high flow during standby periods for efficient cooling, then reduced or stopped during detection periods to eliminate pulsation-induced vibration. This periodic modulation resolves the contradiction between cooling efficiency and vibration reduction.
Solution Approach 2:
The pump operates dynamically with variable speed rather than constant speed. The drive power is adjusted based on operational phase: high power during standby for maximum cooling efficiency, then low power or stopped during detection to eliminate vibration, optimizing both cooling and measurement conditions.
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 effectively suppresses vibration-induced deterioration in detection accuracy by maintaining cooling efficiency and reducing temperature fluctuations, thereby enhancing the reliability and accuracy of light detection.
Implementation Method 1
the coolant delivered by the pump and reaching the heat exchanger exchanges heat with the light detector via the heat exchanger to cool the light detector
Implementation Method 2
exchanges heat with the light detector via the heat exchanger
Implementation Method 3
a pump configured to cause the coolant flow in the coolant flow channel
Implementation Method 4
an electronic cooler configured to be connected between the light detector and the heat exchanger
Data Source
AI summary
A light detecting device includes: a light detector; a heat exchanger thermally connected to the light detector; a coolant flow channel configured to be connected to the heat exchanger and allow a coolant for cooling the light detector to flow; a pump configured to cause the coolant to flow in the coolant flow channel; and a control unit that controls the pump. The control unit performs control such that a first drive power is supplied to the pump during a detection period in which the light detector performs light detection, and a second drive power is supplied to the pump during a standby period in which the light detector stands by without performing light detection, and the first drive power is smaller than the second drive power.