Abstract: Certain aspects of the present disclosure provide methods and apparatus for performing electron paramagnetic resonance (EPR) spectroscopy on a fluid from a flowing well, such as fluid from hydrocarbon recovery operations flowing in a downhole tubular, wellhead, or pipeline. One example method generally includes, for a first EPR iteration, performing a first frequency sweep of discrete electromagnetic frequencies on a cavity containing the fluid; determining first parameter values of reflected signals from the first frequency sweep; selecting a first discrete frequency corresponding to one of the first parameter values that is less than a threshold value; activating a first electromagnetic field in the fluid at the first discrete frequency; and while the first electromagnetic field is activated, performing a first DC magnetic field sweep to generate a first EPR spectrum.

Abstract: Remote measuring and sensing. Some example embodiment related to optical energy harvesting by identification device, such as infrared identification device (IRID devices). Other embodiments relate to RFID device localization using low frequency source signals. Yet still other embodiments related to energy harvesting by RFID in electric fields in both conductive and non-conductive environments.

Abstract: Systems and methods for utilizing a small form-factor, wirelessly powered transceiver are disclosed. In one embodiment, a wireless powered transceiver includes a receive antenna configured to receive a receive signal, a transmit antenna configured to transmit a transmit signal, a power harvesting system including a rectifier circuit configured convert radio frequency energy from the receive signal into DC (direct current) voltage, and a power management unit (PMU) configured to set the operating mode and biasing condition of the receive and transmit circuitry blocks and provide DC voltage from the receive circuitry block to the transmit circuitry block to maintain a minimum voltage, a receiver circuitry block configured to provide energy from the receive signal to the power harvesting system, and a transmitter circuitry block including a data modulator circuit, the data modulator circuit configured to generate the transmit signal using DC voltage received from the power management unit.

Abstract: Systems and methods in accordance with embodiments of the invention implement electronic frequency-comb detector systems. One embodiment includes an electronic frequency-comb detector, where the electronic frequency-comb detector includes: a frequency-comb generator configured to generate a frequency comb reference signal, and a heterodyne mixer. In addition, the heterodyne mixer is configured to use the frequency comb reference signal to downconvert received millimeter wave (mm-wave) and terahertz (THZ) frequency tones into an intermediate frequency (IF) signal. In a further embodiment, the electronic frequency-comb detector includes an IF amplifier, where the IF amplifier is configured to feed a spectrum analyzer configured to detect a signature of a material under test (MUT).

Abstract: Remote measuring and sensing. Some example embodiment related to optical energy harvesting by identification device, such as infrared identification device GRID devices). Other embodiments relate to RFID device localization using low frequency source signals. Yet still other embodiments related to energy harvesting by RFID in electric fields in both conductive and non-conductive environments.

Abstract: Wirelessly powered biosensors are described. In an embodiment, a wirelessly powered electrochemical sensor system includes: an external controller, an implantable microchip that includes an electrochemical sensor coupled to a target molecule, where the microchip communicates with the external controller and receives wireless power from the external controller, where the microchip measures at least one of current and voltage from the electrochemical sensor.

Abstract: Systems and methods for heart stimulation in accordance with embodiments of the invention are illustrated.

Abstract: An Electron Paramagnetic resonance (EPR) system and method allows the measurement paramagnetic characteristics of materials in real-time, such as heavy oil, hydrocarbons, asphaltenes, heptane, vanadium, resins, drilling fluid, mud, wax deposits or the like. The EPR systems and methods discussed herein are low cost, small and light weight, making them usable in flow-assurance or logging applications. The EPR sensor is capable of measuring paramagnetic properties of materials from a distance of several inches. In some embodiments, a window will be used to separate the EPR sensor from the materials in a pipeline or wellbore. Since the sensor does need to be in direct contact with the materials, it can operate at a lower temperature or pressure. In other embodiments, the EPR sensor may be placed in the materials.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for performing electron paramagnetic resonance (EPR) spectroscopy on a fluid from a flowing well, such as fluid from hydrocarbon recovery operations flowing in a downhole tubular, wellhead, or pipeline. One example method generally includes, for a first EPR iteration, performing a first frequency sweep of discrete electromagnetic frequencies on a cavity containing the fluid; determining first parameter values of reflected signals from the first frequency sweep; selecting a first discrete frequency corresponding to one of the first parameter values that is less than a threshold value; activating a first electromagnetic field in the fluid at the first discrete frequency; and while the first electromagnetic field is activated, performing a first DC magnetic field sweep to generate a first EPR spectrum.

Abstract: Wirelessly powered dielectric sensor in accordance with embodiments of the invention are disclosed. In many embodiments, a wirelessly powered dielectric sensor includes an RF-power receiving antenna that receives electromagnetic power, a power management unit (PMU) including a capacitor to rectify and store the electromagnetic power, and a dielectric constant sensing sensor, where the PMU monitors harvested energy and operates the dielectric sensing sensor; and where the dielectric sensing sensor senses a dielectric constant of a material that is in close proximity.

Abstract: Wireless treatment of arrhythmias. At least some of the example embodiments are methods including: charging a capacitor of a first microchip device abutting heart tissue, the charging by harvesting ambient energy; charging a capacitor of a second microchip device abutting the heart tissue, the charging of the capacitor of the second microchip device by harvesting ambient energy; sending a command wirelessly from a communication device outside the rib cage to the microchip devices; applying electrical energy to the heart tissue by the first microchip device responsive to the command, the electrical energy applied from the capacitor of the first microchip device; and applying electrical energy to the heart tissue by the second microchip device responsive to the command to the second microchip device, the electrical energy applied from the capacitor of the second microchip device.

Abstract: Remote measuring and sensing. Some example embodiment related to optical energy harvesting by identification device, such as infrared identification device GRID devices). Other embodiments relate to RFID device localization using low frequency source signals. Yet still other embodiments related to energy harvesting by RFID in electric fields in both conductive and non-conductive environments.

Abstract: Wireless treatment of arrhythmias. At least some of the example embodiments are methods including: charging a capacitor of a first microchip device abutting heart tissue, the charging by harvesting ambient energy; charging a capacitor of a second microchip device abutting the heart tissue, the charging of the capacitor of the second microchip device by harvesting ambient energy; sending a command wirelessly from a communication device outside the rib cage to the microchip devices; applying electrical energy to the heart tissue by the first microchip device responsive to the command, the electrical energy applied from the capacitor of the first microchip device; and applying electrical energy to the heart tissue by the second microchip device responsive to the command to the second microchip device, the electrical energy applied from the capacitor of the second microchip device.

Abstract: Remote measuring and sensing. Some example embodiment related to optical energy harvesting by identification device, such as infrared identification device GRID devices). Other embodiments relate to RFID device localization using low frequency source signals. Yet still other embodiments related to energy harvesting by RFID in electric fields in both conductive and non-conductive environments.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

Abstract: Systems and methods for modulation and demodulation using a micro-Doppler effect are described. In an embodiment, the method includes radiating, using a picosecond pulse generator with an antenna, a train of THz pulses that form a frequency comb, where the frequency comb is reflected from an object such that the frequency several tones in the frequency comb are shifted based on the speed of the object and demodulating the reflected frequency comb to recover a THz Doppler signature of the object.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for closed-loop control of a system using one or more electron paramagnetic resonance (EPR) sensors located on-site. With such EPR sensors, a change can be applied to the system, the EPR sensors can measure the effect(s) of the change, and then adjustments can be made in real-time. This feedback process may be repeated continuously to control the system.

Abstract: A method of wellbore analysis using TM01 and TE01 modes of radar waveforms can include transmitting, at a first time, a radar waveform from a wellhead into a tubing disposed in a wellbore positioned in a reservoir. The radar waveform is either a TM01 mode or a TE01 mode waveform. The tubing includes a fluid, and the surface of the wellbore includes the wellhead. At a second time, a reflected waveform generated by reflecting the transmitted radar waveform on a fluid surface of the fluid is received at the wellhead. A fluid level of the fluid is determined based on the time difference between the first time and the second time, and on a transmission speed of the radar waveform from the wellhead to the fluid surface. The fluid level is a distance between the wellhead and the fluid surface of the fluid.

Abstract: Certain aspects of the present disclosure provide methods and apparatus for performing electron paramagnetic resonance (EPR) spectroscopy on a fluid from a flowing well, such as fluid from hydrocarbon recovery operations flowing in a downhole tubular, wellhead, or pipeline. One example method generally includes, for a first EPR iteration, performing a first frequency sweep of discrete electromagnetic frequencies on a cavity containing the fluid; determining first parameter values of reflected signals from the first frequency sweep; selecting a first discrete frequency corresponding to one of the first parameter values that is less than a threshold value; activating a first electromagnetic field in the fluid at the first discrete frequency; and while the first electromagnetic field is activated, performing a first DC magnetic field sweep to generate a first EPR spectrum.

Abstract: Systems and methods for fracture mapping may utilize frequency changing to aid in providing high-resolution mapping. Integrated chips may be injected into a well and dispersed into a formation. A downhole tool that provides a transmitter and receiver may be positioned in the well. The transmitter may transmit electromagnetic (EM) signals into the formation. The dispersed integrated chips may receive the transmitted EM signal and return a frequency-changed signal to the receiver of the downhole tool. Utilizing the returned frequency changed signal, the system is able to determine the locations of the integrated chips that have been dispersed into the formation and provide fracture mapping. In another variation, the integrated chips may communicate with each other to provide fracture mapping.