Mechanical Superheterodyne and Its Use for Low Frequency Vibrations Sensing

A Low Power 900MHz Superheterodyne Compressive Sensing Receiver for Sparse Frequency Signal Detection

In this report, a full implementation of a compressive sensing receiver is introduced. The receiver is based on the superheterodyne receiver configuration. The systemlevel modeling and design of this structure as well as circuit level design and layout implementation of this structure are demonstrated. The narrowband receiver is designed for 900MHz frequency and can detect sparse signals in the...

Superheterodyne Detection of High Frequency Acoustic Waves

A laser ultrasonic system that allows for the excitation and detection of high frequency (GHz range) acoustic waves using low frequency, low cost detection electronics is presented. A continuous wave diode laser source, operating at a wavelength of 1544nm, is amplitude modulated using an integrated electro-absorption modulator and used to excite high frequency, narrow bandwidth acoustic waves. ...

MEMS Energy Harvesting from Low-Frequency and Low-Amplitude Vibrations

Vibrations of low frequency over the precordium.

A method for taking tracings which represent actual movements of the precordium (displacement curves) or records which show waves proportional to the velocity of movement of the chest wall (velocity curves) is described. The equipment employed is readily available, and the method is easy to use. The displacement curves are nearly identical with cardiograms taken with a good optical setup, and t...

Low-frequency vibrations of DNA molecules.

A model for calculating the low-frequency modes in DNA molecules is presented. The present model is associated with the 'breathing' of a DNA molecule as well as its complementary hydrogen bonds. The calculated results show excellent agreement with the observed low-frequency wavenumber (30 cm-1). Consequently, such an internal motion as reflected in the proposed model might be the origin of the ...