Calibration Apparatus Temperature Gradient Control
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Solution Overview
Problem
Existing calibration apparatuses for temperature probes face challenges in maintaining precise temperature control due to heat loss near the opening and uncontrollable heat discharge from temperature probes, leading to temperature gradients and reduced accuracy.
Innovation Solution
The use of at least two external temperature sensors disposed at dissimilar distances from the opening in the insert allows for precise measurement and control of temperature gradients, enabling improved temperature regulation by connecting these sensors to electric control circuits that manage heat energy elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heating elements are arranged in the calibration chamber, then temperature can be maintained, but heat is conveyed away from the chamber near the opening reducing accuracy
Solution Approach 1:
The insert acts as an intermediary thermal conductor between the heating elements in the calibration chamber and the temperature probe passages. It distributes heat uniformly throughout the chamber while minimizing heat loss at the opening, thereby maintaining temperature stability without direct heating element placement in the opening.
Solution Approach 2:
The insert provides localized thermal management by having different regions with different thermal properties - regions closer to the opening have different thermal characteristics than regions deeper in the chamber. This allows temperature control to be optimized locally at the opening where heat loss occurs most, while maintaining overall chamber temperature stability.
2Measurement precision
If temperature probes are arranged in passages for calibration, then calibration can be performed, but the probes discharge thermal energy uncontrollably creating temperature gradients
Solution Approach 1:
Multiple temperature sensors are placed at different locations within the insert to monitor temperature distribution. This feedback information is used to adjust the heating elements dynamically, compensating for the thermal energy discharge from temperature probes and maintaining temperature uniformity despite the presence of multiple probes in passages.
Solution Approach 2:
The temperature measurement function is segmented across multiple sensors positioned at different locations in the insert rather than relying on a single probe. This allows independent monitoring and control of temperature at each sensor location, compensating for local thermal disturbances from probe discharge.
3Temperature
If multiple heat energy elements are used to reduce temperature gradients, then temperature distribution improves, but control of temperature throughout the insert remains insufficient
Solution Approach 1:
The heating elements are controlled dynamically rather than statically. The control system continuously adjusts the power supplied to each heating element based on real-time temperature readings from multiple sensors, enabling precise temperature control throughout the insert despite the complexity of multiple heat sources.
Solution Approach 2:
The control system varies multiple parameters including power levels, switching sequences, and temperature setpoints for different heating elements. This multi-parameter control approach enables precise temperature management throughout the insert, transforming the challenge of multiple heat sources into an advantage for achieving uniform temperature distribution.
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
This configuration enhances the accuracy and efficiency of temperature calibration by minimizing temperature gradients and allowing for precise temperature control, even under varying thermal loads, thereby improving the overall calibration process.
Implementation Method 1
The insert (3) comprises at least two temperature sensors (15, 17) which are arranged at dissimilar distances from the heating elements (11)
Implementation Method 2
The thermal energy from the heating elements is to propagate through the insert
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A calibration apparatus for temperature detectors comprising an elongate calibration chamber (1 ) with an opening (2) for receiving an insert (3) that has passages (4) for receiving temperature detectors (6), and wherein the chamber (1) has several heat energy elements (9-11) that are controlled by temperature detectors (12-14). In the insert as such one or more external detectors (7) is/are provided, each of which has one or more temperature sensors to the effect that at least two sensors (19, 20 or 15, 17) are provided at respective dissimilar distances to an end of the insert (3). The latter sensors are connected to electronic regulation (20, 23) and measurement units (21, 24) for regulating the supply of power to the heat energy elements.