Two-stage radio-frequency interferometer sensors

Radio Frequency Identification Sensors

RFID systems have been used in numerous applications like asset tracking, toll collection and libraries. The following paper presents our ongoing research for the Auburn University Detection and Food Safety (AUDFS) project to use RFID technology combined with sensors for detection of pathogens in food. AUDFS aims to integrate the breakthroughs in the detection of food borne illnesses with advan...

Optical beat-note frequency stabilization between two lasers using a radio frequency interferometer in the gigahertz frequency band

A beat-note frequency stabilization system using a distributed-feedback laser and external cavity laser diode has become a very important technique for laser spectroscopy, where highly stabilized high-frequency beat notes are required. We have developed a simple and versatile system capable of stabilizing the high-frequency beat notes (3 to 11 GHz) of two lasers using a delayed radio frequency ...

Radio Interferometer Using Fiber-Optic Links Modulated in the Radio-Frequency Range

We investigated a radio interferometer for geodetic use that incorporates commercially available fiber-optic links modulated in the radio-frequency range, and a method for compensating for the delay occurring in the links. With this type of radio interferometer, we can perform baseline analysis without the need for estimating the clock difference between observation stations, which causes a rel...

Wideband micromachined acoustic sensors with radio frequency detection

Silicon micromachining techniques permit batch fabrication of microphones that are small, reproducible, and inexpensive. However, many such sensors have limited bandwidth or are too fragile to be used in a humid, wet, or dusty outdoor environment. Microphones using capacitive micromachined ultrasonic transducer (CMUT) membranes and radio frequency (RF) detection overcome some of the problems as...

An Accurate Sensor Model Representation for Radio Frequency Sensors