Calibrating Microreactor Temperature Sensors via Airflow Thermal Exchange
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Solution Overview
Problem
Current methods for calibrating temperature sensors in chemical microreactors are limited by long calibration times, potential sensor characteristic changes, and increased costs, as well as environmental condition variations that affect performance, with factory calibration being the only available option.
Innovation Solution
A method for calibrating temperature sensors in chemical microreactors using a calibrated sensor immersed in airflow for thermal exchange with the microreactor, allowing for real-time calibration prior to use, which involves determining the resistance-temperature relationship and refining the calibration through temperature pulses and equilibrium measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If factory calibration is performed using purposely designed testing instruments, then calibration precision is improved, but calibration time increases and costs increase
Solution Approach 1:
A calibrated reference temperature sensor is introduced as an intermediary to transfer the calibration function from complex factory testing instruments to a simple portable device. The reference sensor measures the actual temperature of the microreactor block, and this measurement is used to calculate and apply calibration coefficients to the microreactor's temperature sensors, eliminating the need for specialized factory equipment
Solution Approach 2:
The complex mechanical and electrical factory calibration system is replaced with a software-based calibration approach. The control unit automatically performs calibration by comparing readings from the reference sensor with readings from the microreactor sensors, calculating calibration coefficients, and storing them in memory - all through automated computational processes rather than manual factory procedures
2Measurement precision
If factory calibration is performed, then initial calibration is achieved, but time-related drift and environmental condition changes affect sensor performance
Solution Approach 1:
Calibration is performed immediately before use rather than during factory production, ensuring that the calibration reflects the actual environmental conditions and temporal state of the system. This preliminary action right before measurement eliminates time-related drift and environmental variations that would otherwise degrade sensor performance
Solution Approach 2:
The calibration process adapts to changing environmental parameters by performing calibration at the actual operating conditions (temperature, humidity, atmospheric pressure) rather than fixed factory conditions. The system measures and compensates for parameter changes between calibration and use, maintaining accuracy despite environmental variations
3Measurement precision
If factory calibration uses purposely designed testing instruments, then calibration accuracy is maintained, but costs increase
Solution Approach 1:
A calibrated reference temperature sensor serves as an intermediary that transfers calibration capability from expensive factory instruments to an inexpensive portable device. The reference sensor, which can be calibrated once in the factory with high precision, then enables repeated calibrations of multiple microreactor sensors using only simple measurement and computation, eliminating the need for costly specialized equipment
Solution Approach 2:
The calibration function is copied from the factory environment to the field environment through the reference sensor. Instead of requiring expensive factory instruments for each calibration, the system creates a portable copy of the calibration capability that can be used anywhere, significantly reducing costs while maintaining accuracy
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 precise and reliable calibration of temperature sensors just before use, reducing the impact of environmental changes and time-related drifts, while being cost-effective and suitable for both laboratory and field applications, with a simple and fast procedure that can be integrated into the analyzer system.
Implementation Method 1
immersing said calibrated temperature sensor in said airflow produced by said fan so as to cause a thermal exchange between said airflow and said microreactor block
Implementation Method 2
activating said fan so as to produce a flow of cooling air... immersing said calibrated temperature sensor in said airflow produced by said fan
Data Source
AI summary
A method of calibrating a temperature sensor of a chemical microreactor envisages: determining an airflow along a path in such a way as to cause a thermal exchange between the airflow and a chemical microreactor, which is provided with an on-board temperature sensor and is set along the path; and detecting a temperature in the airflow downstream of the microreactor, in conditions of thermal equilibrium.