A wireless, remote query magnetoelastic CO2 sensor.

Journal of environmental monitoring : JEM · 2000 · Unclear · Insufficient evidence

← Research stream

UnclearInsufficient evidencePaper 3959

Study snapshot

PublicationJournal of environmental monitoring : JEM · 2000

Study typeengineering

Reported directionUnclear

Evidence ratingInsufficient

Abstract

This paper presents a wireless, passive, remote query CO2 sensor comprising a ribbon-like magnetoelastic thick-film coated with a mass-changing CO2 responsive polymer synthesized from acrylamide and isooctylacrylate. In response to a magnetic field impulse, the magnetostrictive magnetoelastic sensor vibrates at a characteristic resonant frequency that is inversely dependent upon the mass of the attached CO2 responsive polymer. The mechanical vibrations of the magnetostrictive sensor launch magnetic flux, which can be detected remotely using a pickup coil. By monitoring the resonant frequency of the passive sensor, the atmospheric CO2 concentration can be determined without the need for physical connections to the sensor or specific alignment requirements. The effect of humidity and the CO2 responsive copolymer composition on the measurement sensitivity are reported. Greatest sensitivity is achieved with a polymer comprising a 1:1 mole ratio of acrylamide to isooctyl acrylate. A 0.7% change in atmospheric CO2 concentration can be detected for a 20 microns thick polymer coated sensor.

Machine Enhanced Logic

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 typeengineering

Effect directionunclear

PopulationNot supplied

Sample sizeNot supplied

ExposureNot supplied

Evidence strengthInsufficientConfidence: 74% · Peer reviewed: yes

Main findings

A wireless, passive, remote-query magnetoelastic CO2 sensor is described in which resonant frequency changes inversely with the mass of an attached CO2-responsive polymer and can be detected remotely with a pickup coil. The study reports effects of humidity and polymer composition on sensitivity; the greatest sensitivity occurred with a 1:1 mole ratio of acrylamide to isooctyl acrylate, and a 0.7% change in atmospheric CO2 concentration was detectable with a 20 µm polymer coating.

Outcomes measured

Remote detection/measurement of atmospheric CO2 concentration via resonant frequency shift
Sensor sensitivity to CO2 concentration changes
Effect of humidity on measurement sensitivity
Effect of CO2-responsive copolymer composition on sensitivity

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "other",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Remote detection/measurement of atmospheric CO2 concentration via resonant frequency shift",
    "Sensor sensitivity to CO2 concentration changes",
    "Effect of humidity on measurement sensitivity",
    "Effect of CO2-responsive copolymer composition on sensitivity"
  ],
  "main_findings": "A wireless, passive, remote-query magnetoelastic CO2 sensor is described in which resonant frequency changes inversely with the mass of an attached CO2-responsive polymer and can be detected remotely with a pickup coil. The study reports effects of humidity and polymer composition on sensitivity; the greatest sensitivity occurred with a 1:1 mole ratio of acrylamide to isooctyl acrylate, and a 0.7% change in atmospheric CO2 concentration was detectable with a 20 µm polymer coating.",
  "effect_direction": "unclear",
  "limitations": [],
  "evidence_strength": "insufficient",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "wireless sensor",
    "remote query",
    "passive sensor",
    "magnetoelastic",
    "magnetostrictive",
    "magnetic field impulse",
    "pickup coil",
    "CO2 sensor",
    "humidity",
    "polymer composition",
    "acrylamide",
    "isooctyl acrylate",
    "resonant frequency"
  ],
  "suggested_hubs": []
}

AI can be wrong. Always verify against the paper.

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: 10.1039/b004929h
PubMed: 11296740

Read the original paper →