Nip Sensor Calibration via Automatic Resistance Measurement
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Solution Overview
Problem
Nip measuring devices require calibration to accurately monitor operational parameters of nip rollers, but manual calibration is time-consuming and prone to errors, while calibration during manufacturing may introduce inaccuracies due to temperature and time drifts.
Innovation Solution
An electronic device with a sensor selection circuit, gain selection circuit, and calibration array using fixed resistance elements to automatically determine nip sensor resistance, allowing for self-calibration during operation without manual intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration is performed, then calibration accuracy can be adjusted, but calibration time increases and error probability increases
Solution Approach 1:
The system performs automatic self-calibration using built-in calibration resistors and microcontroller-based automated measurement sequences. The calibration process eliminates manual intervention by automatically switching between sensor channels, applying excitation voltages, measuring resistance values, and computing calibration factors through programmed algorithms.
Solution Approach 2:
Calibration resistors are pre-installed in the measurement circuit during manufacturing, and the system includes pre-programmed calibration routines stored in memory. The microcontroller contains ready-to-execute calibration algorithms that automatically run when triggered, eliminating the need for manual calibration setup and reducing calibration time.
2Measurement precision
If calibration is performed during manufacturing, then initial accuracy is established, but temperature and time drifts cause accuracy degradation
Solution Approach 1:
The system implements periodic automatic recalibration routines that can be triggered at predetermined time intervals or operational milestones. The microcontroller monitors calibration age and automatically initiates recalibration sequences to compensate for drift, ensuring measurement accuracy is maintained throughout the device's operational life.
Solution Approach 2:
The calibration system performs repeated calibration measurements at regular intervals using the built-in calibration resistors. The microcontroller executes periodic calibration cycles that re-measure sensor resistance values against known calibration standards and update calibration factors to compensate for environmental drift and aging effects.
3Measurement precision
If multiple sensors are measured individually, then each sensor can be calibrated separately, but measurement time increases
Solution Approach 1:
The system uses a dynamic multiplexer switching mechanism that rapidly alternates between multiple sensor channels in a time-division multiplexed fashion. The microcontroller coordinates the switching timing to ensure each sensor is measured with the same precision as individual measurement, while the rapid switching enables multiple sensors to be calibrated in sequence without significant time penalty.
Solution Approach 2:
The measurement circuit uses shared components including a single excitation voltage source, a common set of calibration resistors, and a unified measurement amplifier that serves all sensor channels. The microcontroller manages universal calibration routines that can calibrate any number of sensors using the same hardware resources, improving throughput without sacrificing individual sensor measurement precision.
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 solution provides accurate and convenient calibration of nip measuring devices, reducing the need for manual training and minimizing manufacturing complexities, ensuring consistent accuracy over time.
Implementation Method 1
A nip sensor resistance of a corresponding one of the plurality of nip sensors is determined based on the sampled signal on the respective one of the plurality of sensor channel lines and the respective one of the plurality of gain resistances
Data Source
AI summary
An electronic device for calibrating a nip measuring device associated with nip rollers includes a sensor selection circuit configured to receive signals from a sensor array that includes a plurality of nip sensors that are configured to detect operational parameters of the nip rollers, a plurality of sensor channel lines electrically connected between respective ones of the plurality of nip sensors and the sensor selection circuit, a calibration array including one or more calibration resistors, and a calibration channel line electrically connected between the calibration array and the sensor selection circuit. A signal on a respective one of the plurality of sensor channel lines is configured to be sampled by a respective one of a plurality of gain resistances. A nip sensor resistance of a sensor is determined based on the sampled signal on the sensor channel lines and the gain resistances. Related methods and systems are also described.