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OS-MSP Testing & Standards

Public OriginSense test methods and technical drafts for distributed fibre-optic sensing, covering reproducible excitation, valid data, performance calculations and reporting.

Technical Draft v0.1.0 · This is OriginSense Technical Draft v0.1.0. Its provisions and numerical criteria have not undergone interlaboratory reproducibility validation. It is not a published industry standard, third-party certification or declaration of conformity with IEC or SEAFOM.

Measurement methods and product acceptance decisions are separate. The 2 kHz test organisation and analysis gates in Annex A are illustrative, not universal product pass/fail limits. Annex B retains its status as draft normative provisions for record structure.

Public OriginSense methodology

OS-MSP-DAS-01 Technical Draft v0.1.0

Distributed fibre-optic acoustic and vibration sensing systems — Performance parameters and test methods

Part 1: Phase-sensitive OTDR DAS

Document
OS-MSP-DAS-01
Version
v0.1.0
Status
Technical Draft
Draft issued
Online publication

Read OS-MSP-DAS-01 Technical Draft v0.1.0 in full: frequency response, THD, noise ASD, dynamic range, spatial response, uniformity, uncertainty and reporting for phase-sensitive OTDR DAS.

Read the full draftDownload English PDFPDF · 11 pages

Scope

  • Phase-sensitive OTDR DAS using Rayleigh backscatter and phase detection.
  • Separate test-object levels for interrogators, end-to-end chains and field systems.
  • Identify the measurand and calibration chain separately for phase, differential phase, strain and strain-rate outputs.

Test items and method summary

  1. Frequency response

    Stepped steady-state sines, verified actual input, transfer magnitude and uncertainty.

  2. Fidelity and THD

    Stability and harmonic fitting; harmonics beyond Nyquist are not zero distortion.

  3. Excitation-disabled noise

    One-sided PSD and phase ASD; input-referred results retain calibration and coupling.

  4. Dynamic range and linearity

    Separate measured and estimated lower limits, continuous upper limits and covered range.

  5. Spatial response and crosstalk

    Complete spatial curves, main and side lobes, edges and two-point separation criteria.

  6. Spatial uniformity

    Evaluate local uniformity within an excited plateau separately from uniformity across distances.

  7. Fading and long-range behaviour

    Retain valid coverage, loss of lock and cycle slips; distinguish signal performance from throughput.

  8. Statistics, uncertainty and reporting

    Independent repeats, correlation, measurement models, traceable packages and deviations.