Hair Moisture Sensing Control With Capacitive Sensor Arrays
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Solution Overview
Problem
Existing haircare devices struggle to accurately estimate moisture levels in hair, leading to potential over-drying and increased susceptibility to damage, affecting the hair's look, feel, and retention of set styles.
Innovation Solution
A haircare apparatus equipped with multiple capacitive sensors that provide capacitance readings to estimate moisture levels, using a moisture estimation module to control heating and airflow based on these readings, thereby mitigating thermal and mechanical damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single capacitive sensor is used to estimate moisture level, then the device complexity is reduced, but the measurement precision of moisture level is insufficient
Solution Approach 1:
The patent divides the moisture detection function into multiple discrete capacitive sensors arranged in an array along the hair interaction region. Each sensor provides localized capacitance measurements that are then aggregated to create a comprehensive moisture profile, thereby improving overall measurement precision without requiring a single complex sensor
Solution Approach 2:
The patent transitions from single-point moisture measurement to distributed spatial measurement by arranging capacitive sensors along the length of the hair interaction region. This dimensional expansion allows the system to capture moisture variations across different positions, significantly enhancing measurement accuracy while maintaining individual sensor simplicity
2Measurement precision
If multiple capacitive sensors are used to improve moisture level estimation accuracy, then the measurement precision increases, but the device complexity increases
Solution Approach 1:
The patent designs the capacitive sensor array to serve multiple functions: individual sensors detect localized moisture conditions, the collective array provides overall moisture level assessment, and the distributed configuration enables spatial mapping of moisture distribution. This multi-functionality justifies the increased sensor count by delivering comprehensive measurement capabilities
Solution Approach 2:
The patent combines the outputs of multiple capacitive sensors through signal processing to generate a unified moisture level estimation. By merging individual sensor readings into a composite measurement, the system achieves high measurement precision while managing the complexity of having multiple sensors through integrated data processing
3Object-affected harmful factors
If moisture level is not accurately monitored, then the device operation is simpler, but the harmful effects on hair increase due to over-drying
Solution Approach 1:
The patent implements a feedback control system where capacitive sensors continuously monitor moisture levels and provide real-time data to the control module. The control module automatically adjusts drying parameters based on this feedback, creating a closed-loop system that prevents over-drying and minimizes thermal and mechanical damage to hair
Solution Approach 2:
The patent employs preliminary moisture assessment through capacitive sensing before intensive drying begins. By evaluating the initial moisture state and predicting drying progression, the system can pre-adjust heating and airflow parameters to prevent excessive drying and associated hair damage
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 apparatus provides more accurate moisture level estimation, reducing the risk of over-drying and damage by automatically adjusting temperature and airflow, enhancing hair care outcomes.
Implementation Method 1
A capacitive sensor may comprise an electrode plate and drive circuitry, and, for example, hair proximal to the capacitive sensor may interact with an electric field produced by the capacitive sensor such that a capacitance value of the capacitive sensor is modified in use.
Implementation Method 2
hair proximal to the capacitive sensor may interact with an electric field produced by the capacitive sensor such that a capacitance value of the capacitive sensor is modified in use
Implementation Method 3
Water has a relatively high relative permittivity, typically around 80 at room temperature, and so may have a relatively large influence on a capacitance value of the capacitive sensor when water is present in the hair.
Data Source
AI summary
A haircare apparatus has a plurality of capacitive sensors, each capacitive sensor configured to provide a capacitance reading indicative of hair proximal to the haircare apparatus. The haircare apparatus has a moisture estimation module configured to estimate, based on capacitance readings of the plurality of capacitive sensors, a moisture level of the hair proximal to the haircare apparatus.