Nano-Resolution Sensors for Environmental ... - Paroscientific, Inc.

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Intelligent InstrumentationTransducerPressure SignalTemperature SignalMultiplexerCounter15 Mhz ClockEPROMEEPROMMicroprocessorShift StorePass OnRS-232 &RS-485 InRS-232 &485 InterfaceRS-232 &RS-485 OutParoscientific, Inc.
Nano-Resolution Counting TechniquesStart-Stop Reciprocal Counting: Measure time with a high-speed clock for Nsignal periods.Regression Counting: Measure signal periods many times (over-sample) andapply a regression algorithm. This is a Finite-Impulse-Response (FIR) filter with up to100 times higher sensitivity at 1 Hz sampling and Nano-Resolution is possible.IIR Nano-Counting: Uses a multi-stage Infinite-Impulse-Response (IIR) digital lowpassfilter with each stage of the form:w n= α z n+ (1 – α) w n-1z nIs the unfiltered period and w nis the filtered period output after one filter stage.Alpha, α, is small and determines the frequency cutoff value of the low-pass filter.A 5-stage low-pass filter attenuates all values above the cutoff at -100 dB/decade.High-frequency signals are filtered (anti-aliasing filter) and Nano-Resolution is possible.Paroscientific, Inc.
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