Application of piezoelectric quartz crystal as partition detector : development of a digital transducer Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/f4752k91f

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • AT-cut piezoelectric quartz crystals coated with low vapor pressure materials are evaluated as digital transducers in completely digital detection systems for monitoring gas streams. Mathematical relations describing the detectors are developed and tested. Specific application is made to monitoring gaseous sulfur compounds commonly found in stack effluents of pulp mills. It is shown that detectors formed by coating such crystals with a liquid capable of dissolving the gas of interest exhibit reversible characteristics with subsecond response times. Furthermore, if the sorbate-sorbent interactions are physical the detector exhibits linear response to varying concentrations of sorbate over the entire working range. Curvilinear plots are obtained if there are stronger interactions between the sorbate-sorbent pair. In the extreme case where there is chemical reaction between the two, the detector becomes irreversible, exhibits slow response characteristics, becomes integrating in nature, and can be used as specific detector with very high sensitivity. Instrumentation for actuation and measurement of crystal frequencies and for interfacing such detectors to digital computers are developed and evaluated. It is shown that the above-mentioned functions can be performed satisfactorily with inexpensive instrumentation designed around readily available integrated circuits. A partition detector exhibiting reversible response characteristics is applied to on-line data acquisition from a gas chromatograph employing a large general-purpose, time-sharing computer and a remote terminal. Employment of simple, inexpensive interfacing along with the presently available computational facilities on the Campus, permit implementation of a completely automatic data acquisition system. This approach, as an alternative to the use of small dedicated digital computers, is worthy of serious consideration. Behavior of the partition detector as applied to gas chromatography is described mathematically. It is shown that such a detector is sensitive to carrier gas flow rates and therefore is a concentration detector rather than a mass flow type. Furthermore, since this detector is sensitive to partition coefficient of the sorbate gas it can be used for confirming identity of components suspected of belonging to a known homologous series.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 5.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-02-20T20:24:09Z (GMT) No. of bitstreams: 1 JanghorbaniMorteza19720000.pdf: 1282026 bytes, checksum: f1282a025dcfa0e415738a494e1008fa (MD5)
  • description.provenance : Submitted by Lauren Kaysen (lkscannerosu@gmail.com) on 2014-02-11T23:02:23Z No. of bitstreams: 1 JanghorbaniMorteza19720000.pdf: 1282026 bytes, checksum: f1282a025dcfa0e415738a494e1008fa (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2014-02-12T16:33:05Z (GMT) No. of bitstreams: 1 JanghorbaniMorteza19720000.pdf: 1282026 bytes, checksum: f1282a025dcfa0e415738a494e1008fa (MD5)
  • description.provenance : Made available in DSpace on 2014-02-20T20:24:09Z (GMT). No. of bitstreams: 1 JanghorbaniMorteza19720000.pdf: 1282026 bytes, checksum: f1282a025dcfa0e415738a494e1008fa (MD5) Previous issue date: 1971-12-31

Relationships

In Administrative Set:
Last modified: 08/17/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items