Passive surface wave sensor which can be wirelessly interrogated
First Claim
1. In a system including an interrogation device having a transmitting part supplying interrogation signals, a receiving part and an evaluation part,a passive-apparatus to be interrogated by radio and used as a measuring sensor, comprising:
- a first passive surface wave structure defining a sensor element supplying sensor output signals upon receiving interrogation signals from the transmitting part of the interrogation device;
a second passive surface wave structure defining a reference element supplying reference output signals upon receiving the interrogation signals from the transmitting part of the interrogation device;
the interrogation device interrogating a measured value being formed from a comparison of the output sensor signals of said sensor element and the reference output signals of said reference element resulting from the interrogation signals; and
said sensor element and said reference element having different sensitivities to a variable to be measured.
1 Assignment
0 Petitions
Accused Products
Abstract
In a passive surface wave sensor for measured value determination, a measured value is transmitted by radio from a remote measuring location to an interrogation device, which transmits energy by radio to a sensor element as an interrogation pulse. The surface wave sensor is suitable for contactless measured value acquisition. A surface wave configuration is the sensor element and a surface wave reference element is provided for phase discrimination and/or propagation time measurement. As a further development, a sensor operated with chirped transmitting signals and having chirped reflectors is provided, in which the configuration has a reference function in place of the reference element. A sensor constructed in such a way that it has a chirped function has the characteristics of an imminently temperature-compensated sensor for measuring other physical or similar variables.
121 Citations
43 Claims
-
1. In a system including an interrogation device having a transmitting part supplying interrogation signals, a receiving part and an evaluation part,
a passive-apparatus to be interrogated by radio and used as a measuring sensor, comprising: -
a first passive surface wave structure defining a sensor element supplying sensor output signals upon receiving interrogation signals from the transmitting part of the interrogation device; a second passive surface wave structure defining a reference element supplying reference output signals upon receiving the interrogation signals from the transmitting part of the interrogation device; the interrogation device interrogating a measured value being formed from a comparison of the output sensor signals of said sensor element and the reference output signals of said reference element resulting from the interrogation signals; and said sensor element and said reference element having different sensitivities to a variable to be measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
-
Specification
-
- Resources
-
Current AssigneeSiemens AG
-
Original AssigneeSiemens AG
-
InventorsRuppel, Clemens, Reindl, Leonhard, Muller, Folkhard, Bulst, Wolf-Eckhart, Seifert, Franz
-
Primary Examiner(s)Lobo, Ian J.
-
Application NumberUS08/270,931Time in Patent Office2,317 DaysField of Search342/42, 342/44, 342/50, 342/51, 340/825.54, 340/825.72, 340/10.1US Class Current342/42CPC Class CodesG01S 13/34 using transmission of conti...G01S 13/755 using delay lines, e.g. aco...G06K 19/0675 the resonating marks being ...
