Passive wireless acoustic wave chemical sensor
First Claim
1. A chemical sensor system for sensing a chemical and/or biochemical constituent, the chemical sensor system comprising:
- a surface acoustic wave device having an absorbing layer, wherein the absorbing layer absorbs the chemical and/or biochemical constituent and affects an output signal of the surface acoustic wave device;
means for wirelessly providing power to the surface acoustic wave device; and
means for wirelessly receiving the output signal from the surface acoustic wave device.
1 Assignment
0 Petitions
Accused Products
Abstract
A passive wireless acoustic wave chemical sensor can be utilized for monitoring the concentration of an analyte in a substance such as blood. Such an acoustic wave chemical sensor can be configured to include one or more interdigital transducers and a selective coating formed upon a piezoelectric substrate. The coating and the interdigital transducer(s) can be used to convert electrical signal to surface waves thereof. An antenna can be connected to the acoustic wave device, wherein the antenna receives one or more input signals, which excite the acoustic device and to produce an output signal that is related to the concentration of the analyte of interest.
-
Citations
58 Claims
-
1. A chemical sensor system for sensing a chemical and/or biochemical constituent, the chemical sensor system comprising:
-
a surface acoustic wave device having an absorbing layer, wherein the absorbing layer absorbs the chemical and/or biochemical constituent and affects an output signal of the surface acoustic wave device;
means for wirelessly providing power to the surface acoustic wave device; and
means for wirelessly receiving the output signal from the surface acoustic wave device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A chemical sensor for sensing a chemical and/or biochemical constituent, the chemical sensor comprising:
-
a surface acoustic wave device having an absorbing layer, wherein the absorbing layer absorbs the chemical and/or biochemical constituent and affects an output signal of the surface acoustic wave device;
means for wirelessly receiving a power signal to power the surface acoustic wave device; and
means for wirelessly transmitting the output signal. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
-
-
30. A method for sensing a chemical and/or biochemical constituent, the method comprising the steps of:
-
providing a surface acoustic wave device having an absorbing layer, wherein the absorbing layer absorbs the chemical and/or biochemical constituent and affects an output signal of the surface acoustic wave device;
exposing the absorbing layer to the chemical and/or biochemical constituent;
wirelessly providing power to the surface acoustic wave device via a power signal; and
wirelessly receiving the output signal from the surface acoustic wave device. - View Dependent Claims (31, 32, 33, 34)
-
-
35. A method for sensing a chemical and/or biochemical constituent, the method comprising the steps of:
-
providing a surface acoustic wave device having an absorbing layer, wherein the absorbing layer absorbs the chemical and/or biochemical constituent and affects an output signal of the surface acoustic wave device;
exposing the absorbing layer to the chemical and/or biochemical constituent;
providing an initialization signal to the surface acoustic wave device, the initialization signal causing the surface acoustic wave device to produce an acoustic wave that helps break down bonds between the absorbing layer and the chemical and/or biochemical constituent to increase the response time of the surface acoustic wave device;
providing power to the surface acoustic wave device via a power signal; and
receiving the output signal from the surface acoustic wave device, wherein the output signal is related to the concentration of the chemical and/or biochemical constituent. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43)
-
-
44. A chemical sensing system for sensing a chemical and/or biochemical, comprising:
-
a surface acoustic wave sensor having at least one interdigital transducer above a piezoelectric substrate, the surface acoustic wave sensor producing an acoustic wave in the piezoelectric substrate along a path;
an absorbing substance coupled to the piezoelectric substrate along at least part of the path, the absorbing substance absorbing the chemical and/or biochemical;
an antenna connected to said at least one interdigital transducer, wherein said antenna receives at least one input signal, which excites at least one of the interdigital transducers to produce the acoustic wave in the piezoelectric substrate along the path. - View Dependent Claims (45, 46, 47, 48, 49, 50, 51)
-
-
52. A method for sensing a chemical and/or biochemical constituent in a fluid, the method comprising the steps of:
-
providing a surface acoustic wave sensor for monitoring a concentration of the chemical and/or biochemical constituent in the fluid, wherein the surface acoustic wave sensor includes at least one interdigital transducer and a chemical/biological absorbing coating formed above a piezoelectric substrate, wherein said at least one interdigital transducer is selected to convert electrical signal to surface waves in the piezoelectric substrate; and
connecting an antenna to the surface acoustic wave sensor, wherein said antenna receives at least one input signal, which excites said at least one interdigital transducer to produce an output signal that is related to the concentration of the chemical and/or biochemical constituent in the fluid; and
providing a transmitter, wherein the transmitter produces the input signal that is received by the antenna, wherein the transmitter has a multiple mode interrogation;
a first interrogation mode employing a higher-amplitude signal that induces a shear-horizontal mode in the piezoelectric substrate, wherein the first interrogation mode helps breaks down bonds between the chemical/biological absorbing coating and the chemical and/or biochemical constituent in the fluid; and
a second interrogation mode employing a lower-amplitude signal, wherein the second mode is used to obtain a measure of the concentration of the chemical and/or biochemical constituent in the fluid. - View Dependent Claims (53, 54, 55, 56)
-
-
57. A chemical sensor system for sensing a chemical and/or biochemical constituent, the chemical sensor system comprising:
a surface acoustic wave device having an absorbing layer, wherein the absorbing layer absorbs the chemical and/or biochemical constituent and affects an output signal of the surface acoustic wave device, the surface acoustic wave device adapted to operated at a frequency that is above 2.5 GHz. - View Dependent Claims (58)
Specification