High speed sampling of sensors
AssigneeStingray Geophysical Ltd.
InventorJulian Fells
Life of this patent
Estimating the term…
Abstract
Systems and methods for interrogating sensing systems utilising bursts of samples. Bursts of samples correspond to optical pulses returning from optical sensors, where pulses are spaced at a period significantly longer than the pulse width, giving irregular sample spacing. The interrogation system and method processes the irregular busts of samples to recover phase information from received signals.
Claims21
A method of interrogating an optical sensing system performed at an interrogation system, comprising the steps of:
- receiving a plurality of bursts of samples of an optical signal, each burst of samples comprising a plurality of samples of each pulse in a group of discrete optical pulses, wherein the groups are regularly spaced in time with a group repetition period larger than the group width, and the optical pulses comprise a phase modulated signal;
- processing the bursts of samples to obtain a series of regularly spaced samples;
- and
- demodulating the regularly spaced samples to retrieve the phase information from the detected pulses.
A method of interrogating an optical sensing system performed at an interrogation system, comprising the steps of:
- receiving a plurality of bursts of samples of an optical signal, each burst of samples comprising a plurality of samples of each pulse in a group of discrete optical pulses, wherein the groups are regularly spaced in time with a group repetition period larger than the group width, and the optical pulses comprise a phase modulated signal;
- calculating the instantaneous frequency of the signal represented by each burst of samples;
- and
- recovering phase information of the detected pulses.
A method of interrogating an optical sensing system performed at an interrogation system, comprising the steps of:
- receiving a plurality of bursts of samples of an optical signal, each burst of samples comprising a plurality of samples of each pulse in a group of discrete optical pulses, wherein the groups are regularly spaced in time with a group repetition period larger than the group width, and the optical pulses comprise a phase modulated signal;
- phase locking a signal to the samples of each burst of samples;
- and
- utilise the phase locked signal to recover phase information of the detected pulses.
Dependencies are inferred from the claim text.