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  • 1
    Electronic Resource
    Electronic Resource
    A 200 MHz surface acoustic wave resonator mass microbalance (1991)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 62 (1991), S. 1624-1629 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Surface acoustic wave (SAW) piezoelectric sensors typically used by researchers in analytical applications are based on SAW delay lines. We report here the development of a 200 MHz SAW instrument based on a SAW resonator instead of a conventional delay line. The instrument is small, compact and uses two separate 200 MHz resonator crystals which operate in the dual difference mode. The difference frequency stability is better than 55× 10−9 (±1 Hz) which is comparable to a 10 MHz bulk crystal (on an absolute frequency basis) and at least an order of magnitude better than other commercially available SAW delay lines that operate at comparable frequencies. The mass sensitivity is about 9 × 1010 Hz cm2/g. Response to temperature change is found to be about 20 Hz/°C from −30 °C to 30 °C. Response to pressure is found to be linear from 760 to 415 Torr at 3 Hz/Torr. Detection limits for HCl vapors were determined to be in the low ppb range using a SAW resonator coated with triethanolamine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142442
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Surface acoustic-wave piezoelectric crystal aerosol mass microbalance (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1297-1302 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The feasibility of applying surface acoustic-wave (SAW) piezoelectric crystal technology to the measurement of subnanogram levels of particles and parts-per-million levels of sulfur dioxide has been demonstrated. Improvements necessary for implementing the development of a practical instrument for the real-time measurement of very low aerosol mass and ambient gases have been identified. Mass sensitivity comparisons of a 158-MHz SAW piezoelectric microbalance and a conventional 10-MHz quartz-crystal microbalance (QCM) showed that the SAW crystal was 266 times more sensitive. This is in good agreement with the theoretical value of 250. Frequency stability of a single SAW resonator was 6 parts in 108 over 1 min. Response to temperature change is found to be very linear over the range +30 to −30 °C. Response to pressure change is found to exhibit an aging effect whereby after one complete cycle of pressure variation from 1 atm to 70 mm Hg and back to 1 atm, the SAW response to pressure change decreases by an order of magnitude. A strong response to 15 ppm SO2 has been demonstrated on a chemically coated SAW crystal. With improvements, SO2 measurements at the ppb level should be achievable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140980
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    Paper (German National Licenses)
    Fulltext
  • 3
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    A 200 MHz surface acoustic wave resonator mass microbalance (1991)
    American Institute of Physics
    Details
    Publication Date: 1991-06-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 4
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    Surface acoustic‐wave piezoelectric crystal aerosol mass microbalance (1989)
    American Institute of Physics
    Details
    Publication Date: 1989-07-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 5
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    Field-Domain Ion Spectrometry (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Field-domain ion spectrometry (FDIS) is variant of established technique known as ion-mobility spectrometry. Operates at atmospheric pressure and only requires small pump to draw air sample into instrument. Strength of retarding electric field varied to distinguish among ions of different mobilities. New concept offers potential for development of small, (hand-held), low-power, portable devices detecting airborne chemical substances in real-time at concentrations at parts-per-billion level.
    Keywords: PHYSICAL SCIENCES
    Type: KSC-11465 , NASA Tech Briefs (ISSN 0145-319X); 16; 12; P. 46
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Surface acoustic-wave piezoelectric crystal aerosol mass microbalance (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The development of a particulate mass-sensing instrument based on a quartz-crystal microbalance and enhanced with the new surface acoustic-wave (SAW) technology is reported. Mass sensitivity comparisons of a 158-MHz SAW piezoelectric microbalance and a conventional 10-MHz quartz-crystal microbalance show that the SAW crystal is 266 times more sensitive, in good agreement with the theoretical value of 250. The frequency stability of a single SAW resonator is 6 parts in 10 to the 8th over 1 min. The response to temperature changes is found to be very linear over the range +30 to -30 C. A strong response to 15 ppm SO2 has been demonstrated on a chemically coated SAW crystal.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 60; 1297-130
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A 200 MHz surface acoustic wave resonator mass microbalance (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The development of a 200 MHz SAW instrument based on an SAW resonator instead of a conventional delay line is reported. The instrument is small, compact, and uses two separate 200 MHz resonataor crystals which operate in the dual difference mode. The difference frequency stability is better than 5 x 10 to the -9th (+ or - 1 Hz) which is comparable to a 10 MHz bulk crystal and at least an order of magnitude better than other commercially available SAW delay lines that operate at comparable frequencies. The mass sensitivity is about 9 x 10 to the 10th Hz sq cm/g. Response to temperature change is found to be about 20 Hz/C from -30 C to 30 C. Response to pressure is found to be linear from 760 to 415 Torr at 3 Hz/Torr. Detection limits for HCl vapors were determined to be in the low ppb range using an SAW resonator coated with triethanolamine.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 62; 1624-162
    Format: text
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    NASA TECHNICAL REPORTS
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