Dynamic Porosity Variations in Ceramics

Generazio, Edward R.; Roth, Don J.; Stang, David B.

doi:10.1007/978-1-4613-0817-1_212

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…The complete source code for scanning a 5-by 5-mm square area with the PASS is given in [1]. Typical ultrasonic images obtained by use of the PASS are shown in [2] to [4].…”

Section: Programming For Instrument Control and Data Acquisitionmentioning

confidence: 99%

Software Design and Features for an NDE Image Processing Workstation

Brown

Basart

1990

Review of Progress in Quantitative Nondestructive Evaluation

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INTRODUCTIONThe purpose of this paper is to describe the engineering features of industrial NDE image processing workstation software currently under development in the Iowa State University Electrical and Computer Engineering Department. The software package is designed for use on a generic image processing platform consisting of a commercially available UNIX workstationclass host computer interfaced to a frame grabber board and video camera, and incorporates image processing software developed at ISU's Center for NDE. This image processing software has been developed for use on noisy, low-contrast x-ray images, and has demonstrated its ability to enhance and extract flaws in such images. PACKAGE DESIGN OBJECfiVES AND FEATURESThe design objectives of this project are based on perceived user needs gathered through interaction with the industrial sponsors of the Center for NDE at Iowa State University. These sponsors have indicated that they would like to see an integrated image capture and processing workstation with both a large repertoire of image processing capability and a friendly, intuitive user interface.Thus, the package design objectives are: 1) To provide a user-friendly interface to image processing software that is particularly useful for NDE image processing. 2) To allow the user to produce useful results (i.e. detected flaws) without requiring him/her to become an image processing expert. 3) To provide a wide range of utilities such as image compression and annotation, image file format conversions, audit trails of image processing steps, and macro building. 4) To provide an interface for users who wish to add their own processing algorithms to the package. 5) To make the software as device-independent as possible. 6) To make modification and enhancement of the package by a software developer straightforward. Review of Progress in 1073The user interface allows selection and execution of package functions through an organized hierarchy of menus. The user selects menu items by pointing and clicking with a mouse, and enters input parameters using the mouse and/or the keyboard. On-line help is provided for each menu item and is accessed by clicking the appropriate mouse button on the item. (A twobutton mouse is assumed in the design of the package.) Several different types of windows are used to pass information between the user and the program. On-line help, as well as package configuration information, is displayed in the Information Window. Menu Windows display available menu selections. The Acknowledgement Window advises the user of dangerous situations (e.g. unsaved data in buffer when the user quits the program), and has graphics "buttons" to allow the user to either take the action advised in the window or ignore the message. The Value Window allows the user to interactively change the value of an input parameter to an image processing routine in an interactive processing session. The System Window provides a UNIX shell in which the user may execute UNIX commands from within the package. Image ...

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“…The complete source code for scanning a 5-by 5-mm square area with the PASS is given in [1]. Typical ultrasonic images obtained by use of the PASS are shown in [2] to [4].…”

Section: Programming For Instrument Control and Data Acquisitionmentioning

confidence: 99%

Software Design and Features for an NDE Image Processing Workstation

Brown

Basart

1990

Review of Progress in Quantitative Nondestructive Evaluation

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“…DELAY(l) is the time delay required to place the ultrasonic wave within the digitiz- where the first argument is the address of the digitizer and 64 is the number of samples that are to be averaged, 320 is the intensity of the writing beam in the digitizer and "A" is the array that will contain the digitized waveform. The waveform is saved to a file opened as unit 6 with WRITE (6) A After a waveform is collected at one point, another point is selected with the X-Y-Z positioning table with CALL MOVXYZ (2,1,1) where the first argument corresponds to the address of the X-axis. The second argument corresponds to the axis to be moved one step (1, 2 and 3 for the X-1 Y-and Z-axis, respectively).…”

Section: Programming For Instrument Control and Data Acquisitionmentioning

confidence: 99%

Interfacing Laboratory Instruments to Multiuser, Virtual Memory Computers

Generazio

Roth

Stang

1990

Review of Progress in Quantitative Nondestructive Evaluation

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Computers based on virtual memory. multiuser architecture have recently become economically available to medium sized research groups (about 25 members). These new computers offer advantages to the experimentalist. though acceptance has been sometimes limited. One of the most important advantages of a virtual memory machine is the capability of fast access to arrays having dimensions greater than 64 kbytes. Arrays larger than 64 kbytes were available on some older computers based on physical memory. The access time to the memory beyond 64 kbytes is extremely slow for these systems. Fast access to large arrays is particularly important now where large data sets are required for research systems.Many researchers are accustomed to a dedicated computer running a single-user operating and data acquisition system. When there are several experimentalists in a research group. the advantage of a multiuser system becomes important. The resources a computer provides can be shared among the users at a much lower cost than that of maintaining a separate dedicated computer and peripherals for each project. Software routines for instrument control and data acquisition as well as data bases are sharable resources. Expensive hardware resources. such as array processors. images processors. terminals. printers and color plotters can also be shared.There are difficulties in assembling the hardware and software facilities required for a multiuser. experimental research oriented system. The single-user operating systems typically use built-in commands for easy instrument communication and other functions well suited for the experimenter's needs. A multiuser computer's input-output capabilities are more powerful but harder to understand. The user is left with the responsibility for bridging the gap between the capabilities provided and his particular needs for data acquisition and communication with devices.

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“…Reflection coefficient and attenuation coefficient maps derived from contact scanning have been used to a lesser extent for characterizing spatial variations in polycrystalline materials (ref. 6) because of an expected sensitivity to surface condition (ref. 15) and edge effects (ref.…”

Section: Introductionmentioning

confidence: 99%

“…13) and more difficulty in quantitatively interpreting results in terms of microstructrual features (ref. 6).…”

Section: Introductionmentioning

confidence: 99%