35results about "Electrostatic instruments" patented technology

The invention is a detection system and in one embodiment uses inexpensive, miniaturized sensors for detecting electric field (E-field) disturbances. Such sensors are easily and covertly deployable and have low power consumption. The devices may incorporate visual or audio alerts and can include communications hardware for transmitting data for further processing of the electrostatic events.

A system and method for using loop topology identification to investigate a transmission line having a plurality of cable segments. At a measurement plane for each segment, a probing signal is transmitted into the cable. A reflected signal is detected, and an equivalent total input impedance is calculated. The system iteratively calculates the distance between the measurement planes as well as the length, characteristic impedance, and the propagation constant of each segment. A model is used to calculate the respective equivalent input impedance of each segment using the calculated characteristic impedance, propagation constant, and length of the preceding segment. The equivalent total input impedance is then calculated from the iteratively calculated segment values.

The electric potential measuring instrument comprises an electrode arranged on a semiconductor substrate at a position opposite to the object of measurement and a modulator for modulating the coupling capacitance between the object of measurement and the electrode. The electrode is the gate electrode of a field effect type transistor. The modulated electric current that flows between the source diffusion region and the drain diffusion region of the field effect type transistor is synchronously detected by a detection circuit with the modulation frequency of the modulator. The output signal that appears on the gate electrode of a field effect transistor can be measured with ease by changing the coupling capacitance between the electrode of an electric potential measuring instrument and an object of measurement.

An interconnection verification device for sensors and a software implementation of interconnection verification between cabling and sensors in large, multi-channel test configurations are disclosed. In a preferred embodiment the sensor assembly comprises a sensor and an indicator electrically connected inline with the sensor. In a preferred embodiment the indicator is an LED. In an even more preferred embodiment, the sensor is an IEPE.

A capacitance measurement method employing a floating gate of a semiconductor device in a circuit having a MOSFET in which a drain is connected to a ground and a source and a gate are connected to each other, and a capacitor having a capacitance Cr connected to the gate, includes: obtaining a slope S from a relationship between voltage Vs of the source and a voltage Vf applied to the capacitor; setting a standard slope S0 as a y-intercept of a first-order linear equation obtained from a relationship between the slope S depending on the source current Is and the Vo(Is); and calculating a gate-to-drain overlap capacitance Cdgo of the MOSFET based on a capacitance Cr of the capacitor and the standard slop S0.

The disclosure relates to a method for calculating surface electric field distribution of nanostructures. The method includes the following steps of: providing a nanostructure sample located on an insulated layer of a substrate; spraying first charged nanoparticles to the insulated surface; blowing vapor to the insulated surface and imaging the first charged nanoparticles via an optical microscope, recording the width w between the first charged nanoparticles and the nanostructure sample, and obtaining the voltage U of the nanostructure sample by an equation.

A triaxial piezoelectric sensor includes a PVDF layer, a first line layer, and a second line layer. The PVDF layer has multiple first electrodes and multiple second electrodes. Each first electrodes corresponds to each second electrodes for forming directions of polarization along the X-Y-Z axes. The first line layer has multiple first electrical connection portions and multiple first signal lines. Each first electrical connection portions corresponds to each first electrodes. The second line layer has multiple second electrical connection portions and multiple second signal lines. Each second electrical connection portions corresponds to each second electrodes. The PVDF layer is sandwiched between the first line layer and the second line layer. When an external force is applied to the PVDF layer, the first signal lines and the second signal lines transmit electrical signals according to the deformation of the PVDF layer.

A carpet static electricity tester belongs to the carpet inspection device technical field, and comprises a base, a rotary mechanism and a rolling mechanism arranged on the base and a static electricity eliminating device which are connected together, wherein, the rotary mechanism is connected with the rotary disc which can rotate horizontally on the base by the electrical motor fixed inside the base via a rotary shaft; the rolling mechanism is connected with a rolling element by a support seat fixed on the base via a support arm. The tester can simulate human walking in a laboratory to evaluate carpet static electricity performance; moreover, the tester can complete automatic operation, automatic data acquisition and automatic computation of results to reduce manual work, thereby ensuring identical test conditions and the comparability of test result. In addition, a friction rolling mechanism can simulate both feet of human to walk on a carpet; a needle ring can fix a test sample on a turntable, therefore, the test sample can rotary along with the turntable; the rolling element which has certain weight is pressed on a carpet test sample; the rolling surface of the rolling elementhas a conductive elastic layer; moreover, the conductive elastic layer can conduct the static electricity generated due to the friction between the elastic layer and the carpet. The tester has simplestructure and design, low cost, convenient manufacture and safe operation.

A device for measuring an electric field in a conducting medium comprises: two electrodes separated by a volume of an insulating medium; a device for measuring current coupled to said electrodes; and adjustment elements making it possible to vary a quantity on which the electrical conductivity of the field measuring device depends.

An electrostatic warning module attached to electronic equipment, which includes a power supply, a signal amplifying device, a triode and an alarm; the signal amplifying device is an operational amplifier, the power supply supplies power to the operational amplifier, and the positive The phase input terminal is electrically connected to the electronic device, the inverting input terminal of the operational amplifier is connected to the negative pole of the power supply, the output terminal of the operational amplifier is connected to the base of the triode, and the collector of the triode is connected to the positive pole of the power supply through the alarm The emitter is connected to the negative pole of the power supply. When the amount of static electricity carried by the human body or objects is too small to pose a threat to electronic equipment, the operational amplifier does not respond; if the static electricity is large, the operational amplifier outputs a high level. By turning on the triode, the siren sounds as a warning of excessive static electricity. The static electricity warning module can detect excessive static electricity that is harmful to electronic equipment, and sends a warning through an alarm to remind operators to pay attention, thereby improving the safety of electronic equipment.

This surface potential sensor is provided with an electret electrode (28), which is configured of a metal film (26) and an electret film (27), said electret electrode being provided on an upper surface of a diaphragm (25) of a semiconductor substrate. Four piezoresistors (29a, 29b, 29c, 29d) are formed on the diaphragm (25), and a distortion quantity detecting unit (32) is configured by forming a bridge circuit using the piezoresistors. Since an electrostatic force that operates between an object and the electret electrode (28) changes corresponding to potential of the object, and the electret electrode (28) warps corresponding to the change, the potential of the object can be detected by measuring a distortion quantity of the electret electrode (28) by means of the distortion quantity detecting unit (32). Consequently, not only the potential of the object but also a polarity thereof can be detected with reduced size and high sensitivity.