Light aircraft often use a heading indicator as a way to know where they’re going. Retired instrumentation engineer [Don Welch] recreated a heading indicator of his own, using cheap ...

Microwave photonics is the practical application of electromagnetic waves with a wavelength between one millimetre and one meter. Microwaves are important for communications, and systems for detecting ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...

Abstract: Achieving high sensitivity and structural integration in metamaterial sensors for liquid permittivity measurement remains a significant challenge, primarily due to limited electromagnetic ...