RTD Conductive Element TCR Range for Linear Signal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional Resistance Temperature Detectors (RTDs) produce non-linear responses or have large responses to small inputs, making direct reading of temperature measurements challenging without a conditioning circuit.
Innovation Solution
The RTD employs a conductive element made from metals or alloys with a temperature coefficient of resistance (TCR) between 10 ppm/° F. and 1000 ppm/° F., allowing for a more controlled and linear resistance response to temperature changes, eliminating the need for a conditioning circuit and enabling direct reading with strain measurement instrumentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RTDs use metallic wires or films with known electrical resistance, then temperature sensing is achieved, but the response signal is non-linear and requires a conditioning circuit for linearization
Solution Approach 1:
The patent changes the temperature coefficient of resistance parameter of the conductive element from conventional values to a specific range (10-1000 ppm/°F). This parameter modification enables the RTD to produce a linear response signal that can be directly read by standard instrumentation without requiring external conditioning circuits for linearization, thus resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent creates a simplified version of the conventional RTD by eliminating the need for complex conditioning circuits. The modified conductive element directly produces a readable linear signal that copies the desired measurement function without the additional linearization hardware, reducing overall system complexity while maintaining temperature measurement capability
2Measurement precision
If conventional RTDs produce large responses to small inputs, then temperature detection sensitivity is achieved, but direct reading becomes difficult without signal attenuation
Solution Approach 1:
The patent modifies the response characteristic parameter of the RTD by selecting conductive elements with specific temperature coefficients (10-1000 ppm/°F). This change produces a scaled response that is both sensitive to temperature changes and within the readable range of standard instrumentation, enabling direct reading without signal attenuation while maintaining detection sensitivity
Solution Approach 2:
The patent uses a moderate temperature coefficient range rather than extreme values. This partial action approach provides sufficient sensitivity for temperature detection while keeping the response magnitude within readable limits, avoiding the need for signal attenuation circuits and enabling direct reading operation
3Ease of manufacture
If conventional RTDs use standard metallic conductors, then manufacturing is simplified, but the output signal requires complex conditioning circuits
Solution Approach 1:
The patent specifies a particular temperature coefficient range (10-1000 ppm/°F) for the conductive element material selection. This parameter specification guides material choice and fabrication processes while producing a conductive element that generates a linear readable signal, eliminating the need for complex signal conditioning circuits and simplifying the overall system despite maintaining manufacturing feasibility
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 approach provides a linear and readable temperature measurement within the range of standard data acquisition equipment, reducing the need for attenuation circuits and allowing direct integration with strain channels, offering accurate temperature readings across a wide temperature range.
Implementation Method 1
a temperature coefficient of resistance from about 10 ppm/° F. to about 1000 ppm/° F.
Data Source
AI summary
A resistance temperature detector (RTD) includes a temperature sensing circuit with a conductive element to receive an input signal and produce an output signal that is a function of temperature. The conductive element is formed from a metal having a temperature coefficient of resistance from about 10 ppm/° F. to about 1000 ppm/° F.