Moisture detection system and method of use thereof

A detection system, moisture technology, applied in chemical instruments and methods, measuring devices, liquid/fluid solid measurement, etc., can solve problems such as affecting the sensitivity of optical sensors, blocking the driver's field of vision, etc.
CN1774359AInactive Publication Date: 2006-05-17PPG IND OHIO INC
11 Cites 6 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
PPG IND OHIO INC
Publication Date
2006-05-17
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The moisture detection system includes electrical conductors disposed on the surface of the substrate. The resonant frequency of the electrical conductor changes depending on the amount of moisture present close to the electrical conductor. The oscillator outputs an oscillation signal with a predetermined amplitude and a predetermined frequency. A resonant circuit is connected to the electrical conductor and responds to the oscillating signal and the resonant frequency of the electrical conductor to output a resonant signal having an amplitude related to the resonant frequency of the electrical conductor. The filter circuit rectifies and filters the resonant signal and sends it to an analog-to-digital converter, which outputs a digital signal related to the rectified and filtered resonant signal. The controller responds to the digital signal to cause a system coupled to the substrate to operate in accordance with the digital signal.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The present invention relates to moisture detection, and more particularly, the present invention relates to moisture detection on vehicle windshields. Background technique

[0002] To date, moisture on vehicle windshields has been detected in four basic ways. Namely, capacitive sensor systems, resistive sensor systems, ultrasonic sensor systems and optical sensor systems.

[0003] Capacitive sensor systems include capacitors formed on the windshield. In response to moisture on the windshield, the capacitance of the capacitor changes. In order to detect the changing capacitance and control the operation of the windshield wiper according to the changing capacitance, a readout circuit is connected. Examples of capacitive moisture sensors include: 5,668,478 to Buschur; 5,682,788 to Netzer; 5,801,307 to Netzer; and US Patent 6,094,981 to Hochstein.

[0004] The resistance measurement system includes two conductive elements, such as conventional whip an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More