Product having a sensor and a surface acoustic wave element, as well as a method and arrangement for determining a measurement variable, which corresponds to a reactance, by a sensor
First Claim
1. A product comprising a sensor, by means of which a measurement variable which corresponds to a reactance and which is within a measurement range can be supplied, having a matching network and having a surface acoustic wave element, with the sensor being connected via the matching network to a first reflector in the surface acoustic wave element, and the first reflector together with the matching network and the sensor forming a resonator, wherein the matching network is formed in such a way that, for a value of the measurement variable within the measurement range, the resonator has a resonance with respect to a reflection of a surface acoustic wave, which propagates on the surface acoustic wave element, on the first reflector.
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Accused Products
Abstract
The product comprises a sensor (1) via which a measured quantity that corresponds to reactive resistance can be furnished within a measuring range. The product also comprises a matching network (2) and a surface wave element (3). The sensor (1) is connected to a first reflector (4) of the surface wave element (3) via the matching network (2). The first reflector (4) forms, together with the matching network (2) and the sensor (1), a resonator which, for a value of the measured quantity within the measuring range, has a resonance with regard to a reflection of an acoustic surface wave on the first reflector (4). The invention also relates to a method for determining the measured quantity and to a corresponding system.
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Citations
15 Claims
- 1. A product comprising a sensor, by means of which a measurement variable which corresponds to a reactance and which is within a measurement range can be supplied, having a matching network and having a surface acoustic wave element, with the sensor being connected via the matching network to a first reflector in the surface acoustic wave element, and the first reflector together with the matching network and the sensor forming a resonator, wherein the matching network is formed in such a way that, for a value of the measurement variable within the measurement range, the resonator has a resonance with respect to a reflection of a surface acoustic wave, which propagates on the surface acoustic wave element, on the first reflector.
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9. A method for determining a measurement variable, which corresponds to a reactance, within a measurement range by a sensor, which is connected via a matching network to a first reflector in a surface acoustic wave element, and which, together with the first reflector and the matching network, forms a resonator, comprising the following steps:
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a) providing the matching network in such a way that the resonator has, for a value of the measurement variable within the measurement range, a resonance with respect to a reflection of a surface acoustic wave, which propagates on the surface acoustic wave element, on the first reflector;
b) generating a surface acoustic wave which propagates on the surface acoustic wave element;
c) generating a first reflected acoustic wave by reflection of the surface acoustic wave on the first reflector;
d) receiving the first reflected surface acoustic wave; and
e) determining the measurement variable from a phase of the first reflected surface acoustic wave. - View Dependent Claims (10, 11, 12)
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13. An arrangement for determining a measurement variable, which corresponds to a reactance, within a measurement range comprising a sensor, which is connected via a matching network to a first reflector in a surface acoustic wave element, and which, together with the first reflector and the matching network, forms a resonator, wherein the matching network is formed in such a way that the resonator has, for a value of the measurement variable within the measurement range, a resonance with respect to a reflection of a surface acoustic wave, which propagates on the surface acoustic wave element, on the first reflector, and wherein the arrangement further comprises:
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a) means for production of a surface acoustic surface wave which propagates on the surface acoustic wave element;
b) means for production of a first reflected surface acoustic wave produced by reflection of the surface acoustic wave on the first reflector; and
c) means for determination of the measurement variable from a phase of the first reflected surface acoustic wave. - View Dependent Claims (14, 15)
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Specification