A review of wireless SAW sensors.

IEEE transactions on ultrasonics, ferroelectrics, and frequency control · 2000 · Unclear · Insufficient evidence

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UnclearInsufficient evidencePaper 3927

Study snapshot

PublicationIEEE transactions on ultrasonics, ferroelectrics, and frequency control · 2000

Study typereview

Reported directionUnclear

Evidence ratingInsufficient

Abstract

Wireless measurement systems with passive surface acoustic wave (SAW) sensors offer new and exciting perspectives for remote monitoring and control of moving parts, even in harsh environments. This review paper gives a comprehensive survey of the present state of the measurement systems and should help a designer to find the parameters required to achieve a specified accuracy or uncertainty of measurement. Delay lines and resonators have been used, and two principles have been employed: SAW one-port devices that are directly affected by the measurand and SAW two-port devices that are electrically loaded by a conventional sensor and, therefore, indirectly affected by the measurand. For radio frequency (RF) interrogation, time domain sampling (TDS) and frequency domain sampling (FDS) have been investigated theoretically and experimentally; the methods of measurement are described. For an evaluation of the effects caused by the radio interrogation, we discuss the errors caused by noise, interference, bandwidth, manufacturing, and hardware tuning. The system parameters, distance range, and measurement uncertainty are given numerically for actual applications. Combinations of SAW sensors and special signal processing techniques to enhance accuracy, dynamic range, read out distance, and measurement repetition rate (measurement bandwidth) are presented. In conclusion, an overview of SAW sensor applications is given.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typereview

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureRF

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

This review surveys wireless measurement systems using passive SAW sensors and describes RF interrogation approaches (time-domain and frequency-domain sampling) investigated theoretically and experimentally. It discusses measurement errors/effects associated with radio interrogation (e.g., noise, interference, bandwidth, manufacturing, and hardware tuning) and provides numerical system parameters, distance range, and measurement uncertainty for applications.

Outcomes measured

Measurement accuracy/uncertainty in wireless SAW sensor systems
Errors/effects related to RF interrogation (noise, interference, bandwidth, manufacturing, hardware tuning)
System parameters and distance range for SAW sensor readout

Limitations

Review paper; no single study design, population, or sample size is described in the abstract
No specific RF frequencies, exposure metrics (e.g., SAR), or biological/health outcomes are reported

View raw extracted JSON

{
  "study_type": "review",
  "exposure": {
    "band": "RF",
    "source": "wireless interrogation of passive SAW sensors",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Measurement accuracy/uncertainty in wireless SAW sensor systems",
    "Errors/effects related to RF interrogation (noise, interference, bandwidth, manufacturing, hardware tuning)",
    "System parameters and distance range for SAW sensor readout"
  ],
  "main_findings": "This review surveys wireless measurement systems using passive SAW sensors and describes RF interrogation approaches (time-domain and frequency-domain sampling) investigated theoretically and experimentally. It discusses measurement errors/effects associated with radio interrogation (e.g., noise, interference, bandwidth, manufacturing, and hardware tuning) and provides numerical system parameters, distance range, and measurement uncertainty for applications.",
  "effect_direction": "unclear",
  "limitations": [
    "Review paper; no single study design, population, or sample size is described in the abstract",
    "No specific RF frequencies, exposure metrics (e.g., SAR), or biological/health outcomes are reported"
  ],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "surface acoustic wave",
    "SAW sensors",
    "wireless measurement",
    "passive sensors",
    "RF interrogation",
    "time domain sampling",
    "frequency domain sampling",
    "measurement uncertainty",
    "interference",
    "signal processing"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1109/58.827416
PubMed: 18238546

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