Wind Speed Sensor Using Thermistor Resistance Waveform Analysis
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Solution Overview
Problem
Existing wind speed measuring devices face challenges in achieving high measurement accuracy, especially in strong winds, due to noise interference and the need for regular calibration of costly components, and have complex configurations that make them difficult and expensive to manufacture.
Innovation Solution
A wind speed measuring device with a constant temperature heat generating device that includes a heat generating element, a switching element, a voltage comparing portion, and a first negative characteristic thermistor element, which generates heat at a predetermined temperature and calculates wind speed based on the waveform of the applied pulse voltage, reducing noise interference and simplifying the configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a thermocouple and thermistor element are used to detect thermal electromotive force and temperature, then measurement capability is provided, but measurement precision deteriorates due to noise interference and requires regular calibration
Solution Approach 1:
The patent extracts the temperature detection function from the thermal electromotive force detection system. By using the temperature dependence of the thermistor element's resistance, the device directly detects temperature without relying on thermal electromotive force measurement, thereby eliminating the noise interference associated with voltage detection circuits
Solution Approach 2:
The patent replaces the electrical measurement system (thermal electromotive force detection circuit) with a resistance-based temperature detection system. The thermistor element's resistance changes with temperature, providing a direct temperature measurement that is less susceptible to noise and eliminates the need for complex voltage measurement and calibration
2Measurement precision
If thermal electromotive force detection circuit and temperature measuring circuit are used, then temperature detection is enabled, but device complexity increases and manufacturing cost rises
Solution Approach 1:
The patent merges the temperature detection function into the existing thermistor element used for temperature compensation. The same thermistor element serves dual purposes: compensating for temperature effects on the heating element and directly providing temperature measurement through its resistance value, thereby eliminating the need for separate detection circuits
Solution Approach 2:
The thermistor element is given multiple functions: it acts as both a temperature compensation component for the heating element and as a temperature sensor. This multi-functionality reduces the overall component count and simplifies the circuit configuration while maintaining temperature detection capability
3Measurement precision
If thermocouple and calibration circuits are used, then measurement capability is provided, but ease of manufacture deteriorates due to complex configuration
Solution Approach 1:
The patent removes the complex calibration circuits and thermal electromotive force detection components from the system. By relying on the inherent temperature-resistance characteristics of the thermistor element, the device achieves temperature measurement without requiring complex calibration infrastructure, thereby improving ease of manufacture
Solution Approach 2:
The thermistor element inherently provides temperature measurement information through its resistance value without requiring external calibration circuits or complex processing. The system uses the natural physical property of the thermistor (temperature-dependent resistance) to self-determine temperature, eliminating the need for additional calibration components
4Measurement precision
If A/D converter and calibration circuits are used, then measurement accuracy is maintained, but product cost increases
Solution Approach 1:
The patent replaces expensive, complex components (A/D converter, calibration circuits) with a simple, inexpensive thermistor element that provides sufficient measurement accuracy for the application. The thermistor's resistance measurement can be done with simple voltage division circuits, eliminating the need for costly A/D conversion and calibration infrastructure
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
The solution provides high measurement accuracy with reduced noise interference and lower manufacturing costs, as it eliminates the need for expensive components like A/D converters and simplifies the device configuration.
Implementation Method 1
a first negative characteristic thermistor element and at least one resistance element are connected in series to define a temperature detection voltage dividing circuit
Implementation Method 2
The heat generating element generates heat with electricity supplied from the electricity input portion
Data Source
AI summary
A wind speed measuring device includes a constant temperature heat generating device that generates heat at a predetermined set temperature. The constant temperature heat generating device includes a power source, a heat generating element, a switching element, a comparator element, a first negative characteristic thermistor element, and a plurality of resistance elements. The heat generating element and the first negative characteristic thermistor element define a wind speed sensor. The switching element repeats turning on and off to make the heat generating element generate heat at a predetermined set temperature. A pulse voltage is applied from the power source to the heat generating element. A wind speed of a wind contacted with the wind speed sensor is calculated based on a wave form of the applied pulse voltage.