摘要:
Disclosed herein is a sensor for measuring static charge of fibers, comprising: a sensor handle which is insulated; a metal sensor head connecting to the sensor handle; an electrometer and a capacitor, both inside of the sensor handle; and a display on the handle, and wherein the static charge generated during a contact between the fiber and the sensor head is transferred from the sensor head to the capacitor, measured by the electrometer connected to the capacitor, and shown on the display. The sensor head is preferably in the shape of a brush or comb, and the static charge is generated during combing.
摘要:
An electrodynamic sensor comprises a high input impedance electrometer adapted to measure small electrical potentials originating from an object under test and having a pair of input probes, characterised in that at least one of said pair of input probes has no direct electrical contact with said object, wherein the circuit arrangement of said electrometer comprises an amplifier which includes a combination of ancillary circuits cumulatively to increase the sensitivity of said electrometer to said small electrical potentials whilst not perturbing the electrical field associated therewith.
摘要:
The disclosed electrometer (100) includes an integrating amplifier (12, 16) and an electronically controlled switch (110, 111, 112, 113). When the switch (110, 111, 112, 113) is closed, the electrometer (100) is reset or cleared and when the switch (110, 111, 112, 113) is open, the amplifier (112, 16) operates as an integrator. The switch (110, 111, 112, 113) is configured to substantially eliminate leakage currents between the switch (110, 111, 112, 113) and the inputs of the amplifier (112, 16). The electrometer (100) is operative for very small input currents and is operative over a wide dynamic range.
摘要:
On a mis au point un procédé et un appareil permettant de mesurer les forces de Coulomb déterminées en fonction des charges et des caractéristiques diélectriques d'un échantillon (50) testé. Une électrode de polarisation (30) reçoit une tension (U) de sorte qu'un bras d'équilibre (140) soit maintenu à sa position d'origine. On provoque des changements dans l'échantillon à l'aide de n'importe quel stimulus ionisant, tel que le chauffage.
摘要:
The invention relates to a device (10) for contactlessly detecting an electrical potential of an object (12), comprising an electrode element (14), a measuring device (20) for detecting a temporal change in a charge status of the electrode element (14), and an evaluation device (60) for determining the potential of the object (12) by means of the change in the charge status and an electrical capacity of an arrangement comprising the electrode element (14) and the object (12), wherein the electrode element (14) is movably suspended on a support element (18) by means of a suspension element (28). The device (10) comprises a control device (34) for moving the electrode element (14) relative to the support element (18), and the electrode element (14), the suspension element (28), the support element (18) and the control device (34) are formed by a micro-mechanical component.
摘要:
The disclosed electrometer (100) includes an integrating amplifier (12, 16) and an electronically controlled switch (110, 111, 112, 113). When the switch (110, 111, 112, 113) is closed, the electrometer (100) is reset or cleared and when the switch (110, 111, 112, 113) is open, the amplifier (112, 16) operates as an integrator. The switch (110, 111, 112, 113) is configured to substantially eliminate leakage currents between the switch (110, 111, 112, 113) and the inputs of the amplifier (112, 16). The electrometer (100) is operative for very small input currents and is operative over a wide dynamic range.
摘要:
Zur Ausmessung von Spannungsquellen mit kapazitiver Innenimpedanz (Z G ) wird sie einem Ladungsverstärker (7) aufgeschaltet, dessen Eingangskapazität eine Schwingkapazität (C(t)) umfasst. Der Ausgang des Ladungsverstärkers (7) ist über einen Regler an den Eingang des Messkreises serie-gegengekoppelt. Der Frequenzgang dieser Uebertragungsstrecke (7, PID) wird so ausgelegt, dass der geschlossene Regelkreis gutes Folgeverhalten, mindestens bis zu Signalfrequenzen entsprechend der Anregungsfrequenz der Schwingkapazität (C(t)) hat. Durch die Schwingung der Kapazität erscheint am Ausgang (A) ein mit der Spannung über besagter Kapazität amplitudenmoduliertes Wechselsignal. Dieses wird ausgefiltert (13), verstärkt (15) und amplituden-demodulier (17). Das demodulierte Signal wird gefiltert, über einen Hochohmwiderstand (R) als Strom dem Stromsummationsknoten des Ladungsverstärkers (7) zugeführt. Durch Ueberlagerung einerseits des Stromes durch die Schwingkapazität, andererseits eines Stroms, der proportional zu der auf der Schwingkapazität (C(t)) aufliegenden Ladung ist, wird eine hohe Verstärkung vor dem Ladungsverstärker (7) realisiert, wodurch Störgrössen (l z ) an dessen Eingang ausgeregelt werden. Verbleibende Störgrösseneinflüsse werden abgeglichen, indem im Bereich des Ladungsverstärkereingangs ein Strom der Anregungsfrequenz (f mod ) durchgeführt wird.
摘要:
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.
摘要:
The electric potential measuring instrument comprises an electrode arranged on a semiconductor substrate (100) at a position opposite to the object of measurement (106) and a modulation means (104) for modulating the coupling capacitance between the object of measurement (106) and the electrode (101). The electrode (101) is the gate electrode of a field effect type transistor. The modulated electric current that flows between the source (102) diffusion region and the drain diffusion (103) region of the field effect type transistor is synchronously detected by a detection circuit with the modulation frequency of the modulation means. The output signal that appears on the gage electrode (101) of a field effect type transistor can be measured with ease by changing the coupling capacitance between the electrode (101) of an electric potential measuring instrument and an object of measurement (106).