A road condition detection device, to be coupled to the wheel of a vehicle, is provided with: an electrostatic charge variation sensor, to provide a charge variation signal indicative of an electrostatic charge variation associated with the rotation of the wheel; and a processing unit, coupled to the electrostatic charge variation sensor to receive the charge variation signal and furthermore for receiving a rotation speed signal indicative of the rotation speed of the wheel. In particular, the processing unit jointly processes the rotation speed signal and the charge variation signal to detect a road condition of a wet road condition and a dry road condition.

A road condition detection device, to be coupled to the wheel of a vehicle, is provided with: an electrostatic charge variation sensor, to provide a charge variation signal indicative of an electrostatic charge variation associated with the rotation of the wheel; and a processing unit, coupled to the electrostatic charge variation sensor to receive the charge variation signal and furthermore for receiving a rotation speed signal indicative of the rotation speed of the wheel. In particular, the processing unit jointly processes the rotation speed signal and the charge variation signal to detect a road condition of a wet road condition and a dry road condition.

One embodiment provides a technique of adjusting a gate voltage to be applied to at least one MOS capacitor and an amount of electric charges to be stored in the MOS capacitor so as to determine a sensitivity of a change in the amount of electric charges stored in the MOS capacitor, and exposing the MOS capacitor to an electric filed for a predetermined amount of time and then reading an electron inflow or outflow result due to the electric field so as to interpret the intensity and the direction of the electric field, thereby measuring the intensity and the direction of the electric field.

One embodiment provides a technique of adjusting a gate voltage to be applied to at least one MOS capacitor and an amount of electric charges to be stored in the MOS capacitor so as to determine a sensitivity of a change in the amount of electric charges stored in the MOS capacitor, and exposing the MOS capacitor to an electric filed for a predetermined amount of time and then reading an electron inflow or outflow result due to the electric field so as to interpret the intensity and the direction of the electric field, thereby measuring the intensity and the direction of the electric field.

The present disclosure is directed to self-tests for electrostatic charge variation sensors. The self-tests ensure an electrostatic charge variation sensor is functioning properly. The self-tests may be performed while an electrostatic charge variation sensor is active and without interruption to the application employing the electrostatic charge variation sensor.

The present disclosure is directed to self-tests for electrostatic charge variation sensors. The self-tests ensure an electrostatic charge variation sensor is functioning properly. The self-tests may be performed while an electrostatic charge variation sensor is active and without interruption to the application employing the electrostatic charge variation sensor.

An active probe and a method for measuring space charge distribution of polymer are provided. The active probe includes a case, electric pulse transmission unit, piezoelectric ceramic sheet, quartz glass block and signal-extracting aluminum block. An outer surface of the quartz glass block is adhered with a conductive material in contact with the case. An anode of the piezoelectric ceramic sheet is connected to the electric pulse transmission unit, and a cathode of the piezoelectric ceramic sheet is connected to the conductive material on the outer surface of the quartz glass block. The signal-extracting aluminum block is respectively connected with the quartz glass block and the measured signal extraction unit.

An active probe and a method for measuring space charge distribution of polymer are provided. The active probe includes a case, electric pulse transmission unit, piezoelectric ceramic sheet, quartz glass block and signal-extracting aluminum block. An outer surface of the quartz glass block is adhered with a conductive material in contact with the case. An anode of the piezoelectric ceramic sheet is connected to the electric pulse transmission unit, and a cathode of the piezoelectric ceramic sheet is connected to the conductive material on the outer surface of the quartz glass block. The signal-extracting aluminum block is respectively connected with the quartz glass block and the measured signal extraction unit.

A device provides high impedance contact pads for an electrostatic charge sensor. The contact pads are shared between the electrostatic charge sensor and drivers. The contact pads are set to a high impedance state by reducing current leakage through the drivers. Compared to electrostatic charge sensor with low impedance contact pads, the electrostatic charge sensor disclosed herein has high sensitivity, and is able to detect weak electrostatic fields.

A device provides high impedance contact pads for an electrostatic charge sensor. The contact pads are shared between the electrostatic charge sensor and drivers. The contact pads are set to a high impedance state by reducing current leakage through the drivers. Compared to electrostatic charge sensor with low impedance contact pads, the electrostatic charge sensor disclosed herein has high sensitivity, and is able to detect weak electrostatic fields.