Patent
Inductive proximity sensor with high switching speed
Reads0
Chats0
TLDR
In this paper, the distance between sensing coil L1 and object is measured by the pulse width proportional to the phase-shift Ph 1 between the coil current and voltage, where the Schmitt trigger can be added to introduce hysteresis in the switch point.Abstract:
The distance between sensing coil L1 and object is measured by the pulse width proportional to the phase-shift Ph1 between the coil current and voltage. An analogue comparator K1 measures the coil voltage relative to a reference dc voltage and switches a logic gate when the coil voltage becomes larger or smaller than the reference. A second comparator K2 measures the voltage across a reference impedance Zref relative to a second dc voltage and switches a gate. The output from K1 and the inverted K2 output are fed into a logic gate which generates a pulse sequence F of pulse width proportional to the phase-shift at the oscillator frequency. A Schmitt trigger can be added to introduce hysteresis in the switch point.read more
Citations
More filters
Patent
Sensor device for determining the layer thickness of a thin layer
Manfred Jagiella,Sorin Fericean +1 more
TL;DR: In this paper, the authors proposed a sensor device for determining the layer thickness of a thin layer of an electrically conducting or semiconducting material which can be used in a simple and low-cost way.
Patent
Verfahren und vorrichtung zur sicheren abstandsüberwachung
TL;DR: In this paper, a Verfahren zum sicheren Uberwachen eines Abstands (d) eines metallischen Teils (22) relativ zu einem induktiven Naherungssensor is investigated.
Patent
Detektorgerät für ein sich näherndes Objekt
TL;DR: The Detektoreinrichtung is an einem Stosfanger (4) des Fahrzeugs vorgesehen in this article, and umfast¯¯¯¯eine Wicklung (211) als auch Elektrodenleitungen (402 and 403) dienen, um einen menschlichen korper
Patent
Inductive approach sensor, for metallic objects, has LR oscillation bridge circuit with both induction and resistance branches of the circuit having voltage taps connected to them
TL;DR: In this paper, a method for obtaining a signal from an LR oscillation bridge circuit of an approach sensor is presented. But the method is not suitable for the case of an inductive approach sensor.
Patent
A variable differential transformer
TL;DR: In this article, a Linear Variable Differential Transformer (LVDT) is proposed to address measurement errors arising out of the resistance in the VDT coil windings, where the LVDT comprises current sensing means for sensing when the currenir flowing in the lVDT coil is zero.
References
More filters
Patent
Method for reducing the temperature response of a tuned circuit, and an oscillator which is compensated in accordance with this method
TL;DR: In this paper, a method for compensating for a temperature response of an LC tuned circuit, the tuned circuit quality being kept constant by means of a current through a second coil which is coupled in an opposing series connection to the tuning coil, is described.
Patent
Method for measuring a coil with losses and inductive distance sensor constructed in accordance with this method
TL;DR: In this paper, a method and a device for measuring the losses, present in an electrical magnetic radio-frequency field, of a coil with losses by inserting an attenuator, for example a control tab of electrically or magnetically conductive or ferromagnetic material, so that the dependence of the coil Q on temperature is no longer included in the measurement of the attenuation.
Patent
Device for measuring the impedance of sensors with a double-feedback phase locked loop
TL;DR: In this paper, a double-feedback phase-locked loop (PLL) was proposed for frequency-analogous signal evaluation with a measuring phase shifter, arranged as low-pass or high-pass filter with the sensor component in one feedback line.