The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform

Thomas W Kenny - One of the best experts on this subject based on the ideXlab platform.

  • a micromachined magnetic field sensor based on an electron tunneling Displacement Transducer
    Sensors and Actuators A-physical, 2000
    Co-Authors: D P Dilella, Thomas W Kenny, W J Kaise, L J Whitma, R J Colto, E C Vote, J A Podosek, L M Mille
    Abstract:

    We describe a micromachined magnetic-field sensor that is based on an electron tunneling Transducer. This tunnel sensor is small, very sensitive, operates at ambient temperature and requires very little power. The measured resolution of the sensor is 0.3 nT/√Hz at 1 Hz. The limiting resolution, calculated based on fundamental noise sources, is 0.002 nT/√Hz at 1 Hz. The dominant source of the observed noise in the present device is low frequency air pressure fluctuations.

  • development of a modal analysis accelerometer based on a tunneling Displacement Transducer
    Sensors, 1997
    Co-Authors: P R Scheepe, J K Reynolds, Thomas W Kenny
    Abstract:

    An accelerometer based on a tunneling Displacement Transducer is presented. The sensor is fabricated using silicon micromachining techniques for fabrication of the seismic mass, the suspension beams and the tunneling tip and electrodes. The demonstrated accelerometer shows linear response from 0.2 mg to 20 g (159 Hz), and shows a 1 kHz bandwidth. The electron tunneling accelerometer can be used in applications where both a high dynamic range and a reasonable bandwidth are required.

  • novel infrared detector based on a tunneling Displacement Transducer
    Applied Physics Letters, 1991
    Co-Authors: Thomas W Kenny, W J Kaise, Steve Waltma, J K Reynolds
    Abstract:

    The pneumatic infrared detector [M. J. E. Golay, Rev. Sci. Instrum. 18, 347 (1947)] uses thermal expansion of a gas to detect infrared radiation. We have designed a detector based on this principle, but which is constructed entirely from micromachined silicon, and uses an electron tunneling Displacement Transducer to detect the expansion of the gas. The design, fabrication, and characterization of the first prototype sensor are described. Its sensitivity is competitive with the best available uncooled infrared detectors.

Hiroshi Yamaguchi - One of the best experts on this subject based on the ideXlab platform.

  • quantum point contact Displacement Transducer for a mechanical resonator at sub kelvin temperatures
    Applied Physics Letters, 2013
    Co-Authors: Yuma Okazaki, I Mahboob, Koji Onomitsu, Satoshi Sasaki, Hiroshi Yamaguchi
    Abstract:

    Highly sensitive Displacement transduction of a 1.67 MHz mechanical resonator with a quantum point contact (QPC) formed in a GaAs heterostructure is demonstrated. By positioning the QPC at the point of maximum mechanical strain on the resonator and operating at 80 mK, a Displacement responsivity of 3.81 A/m is measured, which represents a two order of magnitude improvement on the previous QPC based devices. By further analyzing the QPC transport characteristics, a sub-Poisson-noise-limited Displacement sensitivity of 25 fm/Hz1∕2 is determined which corresponds to a position resolution that is 23 times the standard quantum limit.

J K Reynolds - One of the best experts on this subject based on the ideXlab platform.

  • development of a modal analysis accelerometer based on a tunneling Displacement Transducer
    Sensors, 1997
    Co-Authors: P R Scheepe, J K Reynolds, Thomas W Kenny
    Abstract:

    An accelerometer based on a tunneling Displacement Transducer is presented. The sensor is fabricated using silicon micromachining techniques for fabrication of the seismic mass, the suspension beams and the tunneling tip and electrodes. The demonstrated accelerometer shows linear response from 0.2 mg to 20 g (159 Hz), and shows a 1 kHz bandwidth. The electron tunneling accelerometer can be used in applications where both a high dynamic range and a reasonable bandwidth are required.

  • novel infrared detector based on a tunneling Displacement Transducer
    Applied Physics Letters, 1991
    Co-Authors: Thomas W Kenny, W J Kaise, Steve Waltma, J K Reynolds
    Abstract:

    The pneumatic infrared detector [M. J. E. Golay, Rev. Sci. Instrum. 18, 347 (1947)] uses thermal expansion of a gas to detect infrared radiation. We have designed a detector based on this principle, but which is constructed entirely from micromachined silicon, and uses an electron tunneling Displacement Transducer to detect the expansion of the gas. The design, fabrication, and characterization of the first prototype sensor are described. Its sensitivity is competitive with the best available uncooled infrared detectors.

Khasa S Karimov - One of the best experts on this subject based on the ideXlab platform.

  • vopcpho based organic pressure sensor and Displacement Transducer
    Synthetic Metals, 2014
    Co-Authors: Mohamad Izza Azme, Qayyum Zafa, Zubai Ahmad, Khaulah Sulaima, Khasa S Karimov
    Abstract:

    a b s t r a c t In this paper, we report on the fabrication and characterization of organic based pressure sensor and Displacement Transducer. For the purpose, an organic semi-conductor, Vanadyl 2,9,16,23-tetraphenoxy- 29H,31H-phthalocyanine (VOPcPhO), is employed as an active material. The fabrication was done on the PEDOT:PSS coated ITO-glass substrates by the methods of spincoating and dropcasting for the displace- ment Transducer and pressure sensor, respectively. By considering the elastic properties of the devices under external mechanical pressure, reversible measurements of the devices' electrical outputs have been demonstrated. The pressure-capacitance and Displacement-capacitance relationships have been obtained from the measurement of the capacitance output of the devices, which afterwards further ana- lyzed and modeled using mathematical expressions. The data analysis suggests a linear pattern of the capacitance-pressure from the devices in the specific ranges of the pressure and Displacement.

Mark Poggio - One of the best experts on this subject based on the ideXlab platform.

  • feedback cooling of cantilever motion using a quantum point contact Transducer
    Applied Physics Letters, 2012
    Co-Authors: M Montinaro, A Mehlin, H S Solanki, P Peddibhotla, Shawn Mack, David D. Awschalom, Mark Poggio
    Abstract:

    We use a quantum point contact (QPC) as a Displacement Transducer to measure and control the low-temperature thermal motion of a nearby micromechanical cantilever. The QPC is included in an active feedback loop designed to cool the cantilever's fundamental mechanical mode, achieving a squashing of the QPC noise at high gain. The minimum achieved effective mode temperature of 0.2 K and the Displacement resolution of 10−11 m/Hz are limited by the performance of the QPC as a one-dimensional conductor and by the cantilever-QPC capacitive coupling.