Smart Sensors with Frequency output: State-of-the-art and Future Development

Abstract State-of-the-art of frequency (duty cycle, period, tinle interval) output sensors is considercd in the Paper. The reasons of lag of frequency output signal processing fronl reaching of nlodern microelectronic technologies is surveyed. It is exhibited, that for effective solution of the problem the tight international cooperation and creation of particular infrastructure is nccessary. The International Frequency Sensor Association (IFSA) creation in 1999 was the first step to such effeclive cooperation.