Everything listed below is free to download and use. All I ask is that you do NOT give it to anyone else. Instead, give them the address of this web site so they may download their own free copy!

I add new items from time to time, so check occasionally to see if there is anything new.

SOFTWARE: Gray Body Calculator (Version 2.0)

Recently updated, the Gray Body Calculator is a stand-alone web page I authored which uses Java Script to perform gray body calculations. It now allows you to enter a response curve for the radiation thermography sensor. It computes either apparent temperature, true temperature, or emissivity.

VIDEO: HDRI Examples

In the YouTube, MPEG, and uncompressed AVI versions of this video, there have 2 examples of High Dynamic Range Images (HDRI) being generated. The first is the result of 7 exposures, each 1 f-stop apart. These 7 images are analyzed by the software (in this case Photomatix) and a HDRI is generated. Since there is currently no physical device which can accurately display an HDRI, a process called tone mapping creates a normal image from the HDRI. This tone mapped image can then be processed using typical image processing functions such as contrast adjustment, color correction, and cropping.

The second example has 5 exposures, also 1 f-stop apart. In this scene of a leaf floating on the water, note how there is detail on the bottom of the shoreline, on the top of the water, and in the objects submersed in the water. While no one exposure captures all of this detail, the final image does so wonderfully.

PAPER: "Characterization of Uncertainties When Measuring Metal Cutting Temperatures Using Infrared Radiation Thermography"

I presented this paper at the 2009 SPIE International Symposium on Defense and Security. There are many error sources when using infrared radiation thermography to measure the temperature distribution of the tool, workpiece, and chip during metal cutting. It is important to understand how these error sources affect the measurement uncertainty. Some are familiar to anyone performing thermography measurements, such as uncertainties in the basic camera calibration. However, metal cutting presents unique measurement challenges due to factors such as the high magnification required, high surface speeds, polarization effects, micro-blackbody effects, and changing emissivity as chips form. This paper presents highlights of the current state of efforts at NIST to catalog and characterize error sources and the resulting uncertainties.

PAPER: "Measurement and Characterization of Dynamics in Machining Chip Segmentation"

I presented this paper at the 2008 CIRP Conference on Modeling of Machining Operations. This paper compares techniques for analyzing the data set derived in the paper below titled "A Novel Peak Detection Algorithm for Use in the Study of Machining Chip Segmentation." Comparing measured chip formation characteristics to those predicted by machining models is an important technique for testing the validity of those models. These characteristics include whether a chip is continuous or segmented, as well as the frequency at which segments form. In this paper, various techniques for measuring segmentation data are reviewed. A sample data set is then used to compare techniques for analyzing segment formation. These techniques show that there is interesting, nonrandom behavior in the sequence of segment formation times. A pattern matching technique is proposed which shows potential to provide valuable additional insight.

PAPER: "A Novel Peak Detection Algorithm for Use in the Study of Machining Chip Segmentation"

I presented this paper at the 2007 ISCA International Conference on Computer Applications in Industry and Engineering. This paper is about much more than just peak detection. It is also about the exciting new methodology of using high-speed digital cameras to image material deformation, using image correlation software to produce strain vectors from those images, and then using those vectors to learn about the material deformation process.

PAPER: "Simultaneous Visible And Thermal Imaging Of Metals During Machining"

I presented this paper at the 2005 SPIE International Symposium on Defense and Security.

PAPER: "The NIST Kolsky Bar Data Processing System"

I presented this paper at the 2005 SEM Annual Conference & Exposition on Experimental and Applied Mechanics. The NIST Kolsky (or Split Hopkinson) Bar is unique for its ability to rapidly heat the sample so that both high strain-rate and high heating-rate effects may be studied.

PAPER: "Manufacturing and Quality Control of the NIST Reference Material 8240 Standard Bullet"

This is an extended abstract of a talk I presented at the 2003 ASPE Annual Meeting.

REPORT WITH SOFTWARE: Application of a "Smart Web Client"

As with any transportation system, the Maryland MARC commuter train has occasional delays. My report outlines an easy to implement system for automatically sending text messages to users cell phones informing then of these delays. It uses a variety of widely available technologies such as PHP and XML files.

The source code is included as an appendix. Alternatively, you may email me and I will send you a text file of the source code and save you the trouble of cutting and pasting it from the PDF file. My email address is at the bottom of this page.


I have been employed at the National Institute of Standards and Technology, formally known as the National Bureau of Standards, from 1978 to the present. I have been here a long time and want to move on. Yep, I am looking for a new job!

I am an author on about 70 publications, a few of which are included in the "Free Stuff" section. I have a B.S. Degree in Computer Science, an A.A. Degree in Electronics Technology, and am currently persuing a Masters in Computer Science. I also have over 700 additional hours of training in diverse topics involving mathematics, electrical engineering, mechanical engineering, and manufacturing. On occasion I have been professionally recognized, and participate in professional organizations.

A list of my work experiences is available. Here are a few highlights:

I have five primary professional interests:

graphic of email address

Last Updated July 8, 2009