PASSIVE DETECTION OF ANALYTES
First Claim
1. A passive element for assisting detection of the presence of an analyte, the passive element comprising:
- a substrate;
a first dipole supported by the substrate;
an analyte-sensitive element associated with the first dipole,the first dipole and the chemoresistive element providing a first absorption cross section at a detection wavelength,the analyte-sensitive element having an electrical conductivity modified by the presence of the analyte so as to modify the first absorption cross section; and
a second dipole disposed on the surface of the substrate, the second dipole having a second absorption cross section at a reference wavelength,the second absorption cross-section being substantially independent of the presence of the analyte.
2 Assignments
0 Petitions
Accused Products
Abstract
A passive element is provided to facilitate passive detection of analytes, such as analytes, using an electromagnetic probe beam. The probe beam may be provided by a radar and/or lidar system. In one example, a passive element comprises a reference dipole and a detection dipole, the detection dipole having an associated analyte-sensitive element, such as a chemoresistive or bioresistive element. When the analyte-sensitive element is in a modified conducting state due to the presence of an analyte, the detection cross section is modified whereas a reference cross section is substantially unchanged by the presence of the analyte. A passive element may comprise a frequency selective surface, for example including a frequency-selective surface (FSS) embedded in a dielectric layer and using an analyte-sensitive impedance layer to modify the electromagnetic absorption properties, allowing analyte detection.
-
Citations
27 Claims
-
1. A passive element for assisting detection of the presence of an analyte, the passive element comprising:
-
a substrate; a first dipole supported by the substrate; an analyte-sensitive element associated with the first dipole, the first dipole and the chemoresistive element providing a first absorption cross section at a detection wavelength, the analyte-sensitive element having an electrical conductivity modified by the presence of the analyte so as to modify the first absorption cross section; and a second dipole disposed on the surface of the substrate, the second dipole having a second absorption cross section at a reference wavelength, the second absorption cross-section being substantially independent of the presence of the analyte. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A passive element for assisting detection of an analyte, the passive element comprising:
-
a frequency selective surface (FSS), the FSS comprising FSS elements; a dielectric layer; and an impedance layer comprising an analyte-sensitive material, the dielectric layer being located between the impedance layer and the FSS, the passive element having an absorption at a detection wavelength, the impedance layer having a sheet resistance modified by a presence of the analyte so as to modify the absorption - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A method for remote passive detection of an analyte, the method comprising:
-
providing a passive element, the passive element including an analyte-sensitive material having an electrical conductivity modified by a presence of the analyte; determining first absorption of the passive element at a detection wavelength, determining a second absorption of the passive element at a reference wavelength from a passive element, detecting the analyte from a comparison of the first absorption and the second absorption. - View Dependent Claims (23, 24, 25, 26, 27)
-
Specification