Capacitive Sensor Embedded in Laminated Glass for Rain Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional capacitive sensors used to detect weather conditions on windshields experience varying levels of accuracy and sensitivity depending on their location, making it challenging to effectively detect rain for automated windshield wiper control.
Innovation Solution
A capacitive sensor integrated within a laminated glass structure with electrodes arranged between glass layers, utilizing a dielectric gap and configured to generate an electric field that extends through the windshield, enhancing sensitivity and accuracy by being embedded within the adhesive interlayer of a laminated glass windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional capacitive sensors are used on windshields, then they can detect weather conditions, but their accuracy and sensitivity vary depending on sensor location
Solution Approach 1:
The sensor transitions from surface mounting to three-dimensional embedding within the laminated glass structure. By placing electrodes on opposite surfaces of the glass and embedding the sensor within the adhesive interlayer, the system creates a volumetric sensing field that extends through the entire windshield thickness, eliminating location-dependent variability.
Solution Approach 2:
The sensor is integrated into the laminated glass composite structure, utilizing the adhesive interlayer as the sensing medium. This composite approach combines the structural glass layers with the functional sensor elements, creating a unified system where the sensor benefits from the glass's structural integrity and optical properties while maintaining consistent performance across different windshield locations.
2Measurement precision
If the capacitive sensor is embedded within the laminated glass structure, then sensitivity and accuracy are enhanced, but device complexity increases
Solution Approach 1:
The sensor manufacturing process is merged with the windshield manufacturing process. By integrating the capacitive sensor electrodes and adhesive interlayer during the glass lamination process, the system eliminates separate sensor installation steps, reducing overall complexity despite the sophisticated embedded structure.
Solution Approach 2:
The adhesive interlayer serves dual functions: providing structural bonding between glass layers and serving as the dielectric medium for capacitive sensing. This multi-functionality reduces the need for additional components and simplifies the overall sensor system architecture.
3Measurement precision
If electrodes are arranged between glass layers with a dielectric gap, then the electric field extends through the windshield for better rain detection, but manufacturing precision requirements increase
Solution Approach 1:
The electrode patterns and adhesive interlayer are prepared and positioned together during the glass lamination process before final assembly. This preliminary positioning ensures proper alignment and spacing are maintained throughout manufacturing, reducing the need for post-assembly adjustments and ensuring consistent electric field geometry.
Solution Approach 2:
The dielectric adhesive interlayer provides mechanical spacing and electrical isolation between electrodes on opposite glass surfaces. The composite lamination structure inherently maintains the required dielectric gap through controlled adhesive thickness, eliminating the need for separate spacers or complex alignment mechanisms.
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 capacitive sensor embedded in the laminated glass windshield provides improved sensitivity and accuracy in detecting rain, enabling effective automated control of windshield wipers by accurately measuring changes in capacitance, even in varying weather conditions.
Implementation Method 1
Capacitive sensors operate by detecting changes in the capacitance formed between a transmission electrode and a sense electrode
Implementation Method 2
The capacitive sensor may be used with a printed circuit board that is configured to electrically couple to the capacitive sensor electrodes
Data Source
AI summary
Various embodiments of the present technology may provide methods and apparatus for a capacitive sensor configured to detect rain. The capacitive sensor may be integrated within an interior surface of a laminated glass structure comprising an adhesive interlayer disposed between two glass layers. The capacitive sensor electrodes may be arranged in a variety of configurations between the two glass layers. The capacitive sensor may be used with a printed circuit board that is configured to electrically couple to the capacitive sensor electrodes.