A high-resolution sensor, the XP-6000CA, detects height changes in 30mm increments by sensing changes in pressure. The sensor, from Epson uses a QMEMS pressure-sensing structure that allows the sensor to fit into a compact package which measures just 7×5×2mm. The sensor operates from a supply voltage of 2.4 to 3.6V. It also provides stable output even under varying external temperatures and environmental conditions, claims the company, because the sensor element is made of highly stable quartz crystal. One feature that distinguishes the sensor is that pressure measurements are resistant to the effects of noise because the sensor uses frequency counting, a principle based on crystal measurement technology, to measure pressure. Resolution is 0.3Pa. Since atmospheric pressure changes by about 0.1Pa with each 10mm change in altitude, a 0.3Pa change in atmospheric pressure is equivalent to a 30mm change in altitude, says the company. The sensor is thus capable of sensing the equivalent of an approximately 30mm change in altitude. The compact sensor can be integrated into applications that require very fine altitude readings in mobile gear such as activity meters and personal navigation devices. It can also be integrated to help make industrial pressure measurement equipment smaller and more space efficient. Operating temperature range is -40 to +85oC.
Electronica: Hall A4: stand 224
