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Sensing apparatus and method

A sensor and intermediate coupling technology, applied in the direction of measuring devices, converting sensor output, using electric/magnetic devices to transfer sensing components, etc., can solve problems such as influence

Inactive Publication Date: 2007-08-15
SENSOPAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem with this inductive sensor is that the noise can be at the same frequency and phase as the sensing signal
This noise component is not removed by phase-sensitive detection, affecting the accuracy of the position measurement

Method used

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  • Sensing apparatus and method

Examples

Experimental program
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no. 1 example

[0027] Figure 1 exemplarily shows a position sensor for detecting the position of a sensor element 1 which is slidably mounted on a support 3 to allow a linear movement in the measuring direction (direction X in Figure 1) . A printed circuit board (PCB) 5 extends in the direction of measurement adjacent to the support 3 and has printed on it conductive paths forming a sine winding 7, a cosine winding 9 and a sensing winding 11, which are all connected to the control Unit 13. A display 15 is also connected to the control unit 13 for displaying numbers representing the position of the sensing element 1 along the support 3 .

[0028] The layout of the sinusoidal winding 7 is such that the current flowing through the sinusoidal winding 7 generates a magnetic field component B perpendicular to the PCB 5 1 The first magnetic field of , which varies along the measurement direction according to one period of the sinusoidal function over the distance L. Similarly, the layout of the ...

no. 2 example

[0048] In a first embodiment, the intermediate coupling element is formed by a winding in parallel with a diode. A second embodiment will now be described with reference to FIG. 8, in which the intermediate coupling element of the first embodiment is replaced by an intermediate coupling element having low impedance characteristics. The remaining components of the second embodiment are the same as the corresponding components of the first embodiment.

[0049] As shown in FIG. 8 , in this embodiment, the intermediate coupling element is formed by a winding 31 , a diode 33 and a capacitor 101 all connected in parallel. The parallel connection of winding 31 with associated inductance and capacitor 101 forms a circuit where the reactance of capacitor 101 effectively cancels the reactance of winding 31 at a certain frequency (hereinafter referred to as the low impedance frequency). In this embodiment, the inductance of the winding 31 and the capacitance of the capacitor 101 are set...

no. 3 example

[0052] In a first embodiment, the winding 31 in the intermediate coupling element is coupled to both the transmit and receive antennas. Since the signal processing circuit uses a carrier frequency f 0 To determine a value representing the position of the sensor element 1 relative to the PCB 5, a signal around the second harmonic of , it is therefore desirable to reduce the value at the carrier frequency f 0 The coupling of the signal to the sensor winding 11.

[0053] A third embodiment is now described with reference to FIGS. 9 and 10 , wherein the layout of the sine winding 7, cosine winding 9 and sensor winding 11 in the first embodiment is changed, and the intermediate coupling element of the first embodiment is replaced by an intermediate coupling component replaced.

[0054] As shown in FIG. 9 , in this embodiment, the intermediate coupling element has an input winding 111 and an output winding 113 . The diode 115 is connected between one end of the input winding 111 ...

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Abstract

There is described a sensor for sensing the parameter, the sensor comprising a transmit aerial, an intermediate coupling element, a receive aerial electromagnetically coupled to the transmit aerial via the intermediate coupling element, a signal generator operable to generate a periodic excitation signal at a first frequency, and arranged to apply the generated excitation signal to the transmit aerial in order to generate a sense signal in the receive aerial indicative of the value of the parameter to be measured and a signal processor operable to process the signal induced in the receive aerial to determine a value representative of the parameter being measured. The intermediate coupling element includes a frequency shifter which, in response to the periodic excitation signal being applied to the transmit aerial, generates a sense signal in the receive aerial having a signal component at a second frequency which is different from the first frequency, and the signal processor is operable to process the signal at the second frequency to determine the value representative of the parameter being measured.

Description

[0001] priority claim [0002] This application claims priority based on UK Patent Application No. 0417686.3 filed 9th August 2004 and UK Patent Application No. 0513710.4 filed 4th July 2005, which applications are hereby incorporated by reference in their entirety as if hereby Give the same in full. technical field [0003] The invention described in this application relates to sensing devices and methods, and in particular, but not exclusively, to position sensors for detecting the relative position of two components. Background technique [0004] British patent application GB 2374424A describes an inductive position sensor in which a transmitting antenna and a receiving antenna are formed on a first part and a resonant circuit with an associated resonant frequency is formed on a second part which is movable relative to the first part. Applying an excitation signal to the transmit antenna, the excitation signal having a frequency component at or near the resonant frequenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/00G01D5/20
CPCG01D5/2093G01D5/2086
Inventor 戴维·阿伦·詹姆斯
Owner SENSOPAD
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