On-Line Liquid and Gas Density Measurement-Advantages of Frequency Domain Transducers

1968 ◽  
Vol 1 (1) ◽  
pp. 14-15 ◽  
Author(s):  
J. Agar
Keyword(s):  
Quality Control ◽  
Frequency Domain ◽  
Gas Flow ◽  
Density Measurement ◽  
Control Applications ◽  
Gas Density ◽  
Flow Metering ◽  
Line Measurement ◽  
Transmission Of Information ◽  
On Line

This paper discusses the advantages of frequency modulated transmission of information in plants, and how this philosophy is adapted in practice in the form of two instruments for on-line measurement of liquid and gas densities. The importance of measuring density is well appreciated for on-line blending and various forms of quality control applications, but special attention is drawn to its necessity in gas flow metering.

Finally: A Reliable, On-Line Carbon-in-Ash Analyzer

2004 ◽  
Author(s):  
J. J. Letcavits ◽  
Hans Conrads ◽  
Ed Shelton ◽  
Todd Sommer
Keyword(s):  
Quality Control ◽  
Fly Ash ◽  
Reliable Data ◽  
Unburned Carbon ◽  
Loss On Ignition ◽  
Representative Sampling ◽  
Line Measurement ◽  
On Line ◽  
Line Technology ◽  
Control Regime

The paper describes the principle features necessary for reliable and representative on-line unburned carbon-in-ash (UBC) measurement. The paper shows how modern on-line technology has been applied to obtain truly representative and reliable data for the evaluation of fly ash quality and boiler performance. To assure accurate UBC data from which to make operating decisions, one must achieve representative sampling in the ash stream, comparability of unburned carbon to loss-on-ignition (LOI) with various fuel types, a quality control regime to ensure the accuracy of the on-line measurement system in comparison with laboratory standards and auditing of the QC process.

Computerized measurement of pulmonary conductance and elastic recoil

1978 ◽  
Vol 44 (4) ◽  
pp. 611-618 ◽  
Author(s):  
H. J. Colebatch ◽  
B. S. Nail ◽  
C. K. Ng
Keyword(s):  
Gas Flow ◽  
Transpulmonary Pressure ◽  
Elastic Recoil ◽  
Analytical Treatment ◽  
Analog To Digital ◽  
Line Measurement ◽  
Order Polynomial ◽  
Maximum Expiratory Flow ◽  
On Line ◽  
Fourth Order Polynomial

A system devloped for on-line measurement of transpulmonary pressure, gas flow at the mouth, change in expired volume and plethysmograph volume uses a minicomputer to control a multiplexed analog to digital converter. The computer identified samples as static or dynamic values by monitoring a voltage activating a solenoid valve, used to close the airway. Analysis of these samples by other task-specific programs yielded the static deflation pressure-volume (PV) curve, the conductance-recoil pressure, GL-Pst(L), relationship and the maximum expiratory flow-volume (MEFV) curve; the MEF-Pst(L) curve and conductance upstream from the equal pressure point were derived. The PV relationship was represented by a fourth-order polynomial and the GL-Pst(L) relationship by linear regression. In 11 subjects the results obtained using on-line data collection, compared with manual analysis of oscillograph recordings, showed small differences in static compliance and in the maximum Pst(L); but overall the two methods showed excellent agreement. Besides advantages of speed and objectivity, this system facilitates a more rigorous analytical treatment of elastic recoil and conductance.

Thickness Measurement in the AEM by Macintosh-Based Analysis of Two-Beam Convergent Beam Patterns

1990 ◽  
Vol 48 (2) ◽  
pp. 504-505
Author(s):  
John F. Mansfield ◽  
Douglas C. Crawford
Keyword(s):  
Electron Microscope ◽  
Video Camera ◽  
Thickness Measurement ◽  
Specimen Thickness ◽  
Crystalline Materials ◽  
Beam Dynamic ◽  
Line Measurement ◽  
On Line ◽  
Image Position ◽  
Convergent Beam

A method has been developed that allows on-line measurement of the thickness of crystalline materials in the analytical electron microscope. Two-beam convergent beam electron diffraction (CBED) patterns are digitized from a JEOL 2000FX electron microscope into an Apple Macintosh II microcomputer via a Gatan #673 CCD Video Camera and an Imaging Systems Technology Video 1000 frame-capture board. It is necessary to know the lattice parameters of the sample since measurements are made of the spacing of the diffraction discs in order to calibrate the pattern. The sample thickness is calculated from measurements of the spacings of the fringes that are seen in the diffraction discs. This technique was pioneered by Kelly et al, who used the two-beam dynamic theory of MacGillavry relate the deviation parameter (Si) of the ith fringe from the exact Bragg condition to the specimen thickness (t) with the equation:Where ξg, is the extinction distance for that reflection and ni is an integer.

Control Strategies for a Highly Loaded Biological Ammonia Elimination Process

1993 ◽  
Vol 28 (11-12) ◽  
pp. 531-538 ◽  
Author(s):  
B. Teichgräber
Keyword(s):  
Closed Loop ◽  
Control Strategies ◽  
Level Control ◽  
Sludge Dewatering ◽  
Loop Control ◽  
Reject Water ◽  
Line Measurement ◽  
Control Pattern ◽  
On Line ◽  
Treatment Facilities

A nitrification/denitrification process was applied to reject water treatment from sludge dewatering at Bottrop central sludge treatment facilities of the Emschergenossenschaft. On-line monitoring of influent and effluent turbidity, closed loop control of DO and pH, and on-line monitoring of nitrogen compounds were combined to a three level control pattern. Though on-line measurement of substrate and product showed substantial response time it could be used to operate nitrification/denitrification within process boundaries.

Studies and research concerning BNFP on-line density measurement

1981 ◽  
Author(s):  
J E Shiley ◽  
L G Jordan ◽  
G A Huff
Keyword(s):  
Density Measurement ◽  
Line Density ◽  
On Line

On-line measurement of pulverized coal fineness on a 300 MWe power plant with pulsed digital inline holography

2021 ◽  
Author(s):  
Qiwen Jin ◽  
Xijiong Chen ◽  
Pei Li ◽  
Yonggang Zhou ◽  
Yingchun Wu ◽  
...  
Keyword(s):  
Power Plant ◽  
Pulverized Coal ◽  
Line Measurement ◽  
On Line
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