Opposing Sensor Pairs for Temperature Gradient Compensation
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Solution Overview
Problem
Existing motion sensors, particularly MEMS sensors, are sensitive to temperature gradients, which cause errors in sensor readings due to non-uniform environmental temperatures, making it challenging to accurately compensate for these gradients, especially in portable devices where thermal effects can be complex and unpredictable.
Innovation Solution
A sensor configuration featuring opposing pairs of sensors with orthogonal axes, where one sensor's axis is oriented in opposition to another, allowing for combined measurements that compensate for temperature gradient effects, thereby canceling out errors associated with thermal gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature compensation techniques are applied during production or using heating elements, then sensor accuracy is improved, but the complexity of the system increases and additional components are required
Solution Approach 1:
The patent employs opposing sensor pairs that automatically compensate for temperature gradient effects through their inherent geometric configuration. The sensors serve themselves by providing differential measurements that inherently cancel out thermal gradient errors, eliminating the need for external compensation mechanisms, heating elements, or complex calibration systems.
Solution Approach 2:
The patent positions sensors in asymmetric opposing pairs with specific geometric relationships to thermal elements. By placing sensors at different locations relative to heat sources and configuring their measurement axes oppositely, the system creates an asymmetric arrangement that enables automatic differential compensation of temperature gradient effects.
2Temperature
If heating elements are used to maintain sensor temperature, then temperature stability is improved, but temperature gradients across the sensor are created causing measurement errors
Solution Approach 1:
The patent converts the harmful temperature gradient effect into a beneficial compensation mechanism. By strategically placing opposing sensors in the thermal field, the temperature gradient that would normally cause errors now creates differential signals that, when processed, automatically cancel out the gradient effects and reveal the true measurement.
Solution Approach 2:
The patent uses the temperature gradient itself as an intermediary for compensation. The gradient creates opposing effects on the paired sensors that serve as mediators, allowing the system to extract compensated measurements by processing the differential output of sensors that experience opposite thermal influences.
3Measurement precision
If multiple temperature sensors are added to measure temperature at multiple locations, then temperature gradient characterization is improved, but the complexity and cost of the system increases
Solution Approach 1:
The patent makes the motion sensors serve a dual function: their primary function of measuring motion is combined with a secondary function of characterizing temperature gradients. The same sensors that measure acceleration or angular velocity also provide temperature gradient information through their differential responses, eliminating the need for separate temperature sensing systems.
4Measurement precision
If sensor pairs with opposing orientations are used, then automatic compensation for temperature gradients is achieved, but the device complexity increases due to additional sensors
Solution Approach 1:
The patent merges the temperature compensation function with the primary motion sensing function. By configuring sensors in opposing pairs, the system combines multiple capabilities into a single sensor arrangement that simultaneously performs motion measurement and thermal gradient compensation, reducing overall system complexity despite the additional sensor elements.
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 significantly reduces temperature gradient-induced errors in sensor measurements, improving accuracy by ensuring that the effects of temperature gradients on both sensors are inverse, resulting in stable and precise output even under varying thermal conditions.
Implementation Method 1
the existence of a temperature gradient across the sensor... temperature gradient refers to the change in temperature across a given dimension/direction of the sensor
Data Source
AI summary
Described herein are methods and systems for configuring sensors to compensate for a temperature gradient. Multiple sensor sets, each having at least two sensors of a same type with orthogonal axes, are positioned to form at least one opposing sensor pair, in which an axis of one sensor of one sensor set is in an opposite orientation to an axis of one sensor of another sensor set. A combined measurement of each opposing sensor pair may be output which is compensated for an effect of a temperature gradient on sensor measurements of the sensors.