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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Galvanometer01:24

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Gradient Echo Quantum Memory in Warm Atomic Vapor
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A Single-Cell Optically Pumped Intrinsic Gradiometer.

Nicholaus Zilinski1, Ash M Parameswaran1, Bonnie L Gray1

  • 1School of Engineering Science, Simon Fraser University, Burnaby, BC V5A 1S6, Canada.

Sensors (Basel, Switzerland)
|March 14, 2026
PubMed
Summary
This summary is machine-generated.

We developed a novel single-cell optically pumped magnetometer (OPM) gradiometer, offering a cost-effective, less complex alternative to SQUID systems for detecting biomagnetic fields.

Keywords:
biomagnetic sensingcommon-mode rejectionintrinsic gradiometeroptically pumped magnetometer

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Area of Science:

  • Biophysics
  • Magnetometry
  • Sensor Technology

Background:

  • Superconducting quantum interference devices (SQUIDs) are standard for biomagnetic field detection but require cryogenic cooling.
  • Optically pumped magnetometers (OPMs) offer a non-cryogenic alternative, enabling more accessible and potentially portable magnetic field sensing.

Purpose of the Study:

  • To design, construct, and characterize a single-cell intrinsic OPM gradiometer.
  • To demonstrate the feasibility of using this OPM gradiometer for detecting biomagnetic signals, such as cardiac activity.

Main Methods:

  • Utilized a rubidium-87 vapor cell with orthogonal pump and probe beams.
  • Employed a balanced polarimeter to measure the spatial magnetic gradient across two sensing regions.
  • Characterized performance including common-mode rejection ratio and sensitivity, and tested with cardiac measurements.

Main Results:

  • Achieved a common-mode rejection ratio >50 dB and sensitivity of 267 pT/cm/√Hz without passive shielding.
  • Successfully recorded preliminary cardiac-synchronous magnetic measurements.
  • Demonstrated a cardiac-synchronous waveform consistent with cardiac timing after signal processing.

Conclusions:

  • The single-cell OPM gradiometer is a viable, cost-effective, and less complex alternative to traditional gradiometers.
  • This design simplifies calibration, modulation, and shielding requirements compared to multi-cell systems.
  • The demonstrated biomagnetic sensing capability shows promise for future applications in medical diagnostics.