Abstract: In general, techniques of this disclosure are directed to a sensor for measuring an external magnetic field. The sensor an optical cavity, a laser medium which together with the optical cavity has a laser threshold, a laser pump, and a radio-frequency (RF) drive applied to the laser medium, such that the laser threshold varies with a change in the external magnetic field. The RF drive may be applied to the laser medium at or around a particular resonance frequency which varies depending on the external magnetic field, such that depending on the value of the external magnetic field, the RF drive induces transitions between at least two states of the laser medium, each state causing a different laser threshold in an intensity of a laser output. Further, the intensity of the laser output may provide a measurement of the value of the external magnetic field.
Type:
Grant
Filed:
October 9, 2015
Date of Patent:
September 25, 2018
Assignee:
RMIT University
Inventors:
Jan Jeske, Andrew Greentree, Jared Cole
Abstract: In general, this disclosure is directed to a flexible or stretchable sensor and a method of detecting a substance and/or electromagnetic radiation using said sensor. The sensor comprises a flexible or stretchable substrate, a pair of terminal electrodes disposed on the flexible or stretchable substrate in mutually spaced apart and opposing relation, and a sensing element applied to the flexible or stretchable substrate, between and in electrical contact with the pair of terminal electrodes, wherein the sensing element is responsive to a substance and/or electromagnetic radiation impinging thereon, and wherein when a voltage is applied across the sensor, an electrical signal is generated that is proportional to a resistance value corresponding to a sensing of the substance and/or electromagnetic radiation impinging on the sensing element.
Type:
Grant
Filed:
June 3, 2016
Date of Patent:
May 22, 2018
Assignee:
RMIT University
Inventors:
Sharath Sriram, Madhu Bhaskaran, Philipp Gutruf
Abstract: Mental state of a person is classified in an automated manner by analysing natural speech of the person. A glottal waveform is extracted from a natural speech signal. Pre-determined parameters defining at least one diagnostic class of a class model are retrieved, the parameters determined from selected training glottal waveform features. The selected glottal waveform features are extracted from the signal. Current mental state of the person is classified by comparing extracted glottal waveform features with the parameters and class model. Feature extraction from a glottal waveform or other natural speech signal may involve determining spectral amplitudes of the signal, setting spectral amplitudes below a pre-defined threshold to zero and, for each of a plurality of sub bands, determining an area under the thresholded spectral amplitudes, and deriving signal feature parameters from the determined areas in accordance with a diagnostic class model.
Type:
Grant
Filed:
August 23, 2010
Date of Patent:
June 16, 2015
Assignee:
RMIT University
Inventors:
Margaret Lech, Nicholas Brian Allen, Ian Shaw Burnett, Ling He
Abstract: The present invention provides an optical modulator for modulating an optical carrier by an electrical signal. The modulator comprises a first and a second waveguide for guiding the optical carrier, each waveguide is formed from, or being juxtaposed with respect to, an electro-optic material. The modulator also comprises a series of cavities associated with the first waveguide and the second waveguide and means for applying the electrical signal having a predetermined bandwidth to the cavities. The cavities have a resonant frequency within the predetermined bandwidth. The present invention also provides a device for optical single sideband with carrier (OSSB+C) transmission. The device has parallel-coupled cavities.
Type:
Grant
Filed:
September 11, 2002
Date of Patent:
March 21, 2006
Assignees:
RMIT University, The University of Melbourne
Inventors:
Arnan Mitchell, Rodney B. Waterhouse, Apalavanapillai Nirmalathas, Dalma Novak