Hobby: Optics

Leave a comment

I only worked on optical systems that others had designed at Subaru Telescope, but while there I met Dr. Stephen Pompea of the National Optical Astronomy Observatory.  He had worked with Nishimura San of Subaru when they were both at U of Arizona and “Nishi” was always kind enough to take me along when he visited with other scientists from the mainland.

Dr. Pompea has always been an evangelist for teaching optics to pre-high school youth and in 2003 he got an NSF grant for “Hands-on optics” which gave teaching materials to grade school teachers in optics.  I was invited to participate in the inaugural class held at USC in 2003 and was able to teach it to a few of the home-schooled kids in Spokane, Washington.

The class provided a large notebook and a wide range of projects for us to teach with, but I went beyond the materials provided and built optical rails, and other “toys” for kids to take home to play with.



Hobby: Holography

Leave a comment

In the early 1960s Holography emerged as one of the most exotic uses of the unique light produced by lasers.  By the early 1970s it began to make the transition from scientist only to hobbyist.  At first it was to exploit it as an artistic medium but the amateurs that saw its potential quickly developed innovations of media and techniques that became main-stream.

By the mid 1990s the nascent “World Wide Web” had one or two Usenet newsgroups called alt.holography dedicated to the hobby.  Between this and a couple of “how-to” books published by the 1970s superstars of the San Francisco Holography Art movement everyone had access to the technology.

The hardware came available with affordable Kodak holography plates and the surplus lasers from copy machines made the hobby approachable to interested amateurs.  holo1

My holography table was built from the aft bulkhead of a 747 from Boeing Surplus which is a two-inch high honey-comb sandwiched between two aluminum sheets.  I added padding and bricks and placed it in my basement.

In the configuration seen in the pictures it is making a reflection hologram of some plaster whales.  One beam illuminates the whales, while the other illuminates the plate at the far right.

As yholo2ou can see, this is all stuff hacked together from scraps.




Hobby: Rocketry

Leave a comment

The 1990’s was a wonderful time to be a hobbyist.

The contagious optimism of that time lent itself well to the enthusiasms of people and families [ 😦  mostly men and mostly white] who bonded in far flung disciplines that had always been the purview of “trained professionals”.

One of the hobbies that decade “launched” was high power rocketry.  There were always two reactions the first time anyone ever saw a launch of anything bigger than the “Estes”rockets you could buy at any hobby store:  Awe and fear that you could do more than take someone’s eye out.  To assuage such fears, the hobby community itself, the US rocketsFederal Aviation Administration and the Bureau of Alcohol, Tobacco and Firearms provided strict regulations around the storage, purchase and use of any rocket motors with a specific impulse above 36 Lb-seconds.  In order to better assure that the hobbyist would align with these regulations, hobbyists associations coordinate the launches and supply amateurs with the supplies and training they need.

In 1996 I passed my level 1 certification and my level 2 in 1997.  In order to be certified to level 3 (allowing launch of rockets with a specific impulse exceeding 1,150 Lb-seconds) it was traditional to build something novel into the design.  In those days before cell phones and micro-power electronics the favorite was altimeter-based parachute deployment.

EricalchMine was a pic-based system with a clunky altimeter and an enormous T-1 accelerometer but what I really wanted to study was what’s called the mach disks of the rocket’s exhaust.  This is actually a phenomena that reveals volumes about the sonics, plasma and nozzles of all jet and rocket propulsion.




Oligo sensor

Leave a comment

A lifelong ambition of mine has always been to be part of a team of people who race past the conventional boundaries and are surprised by every new possibility.  Where being creative was a habit that you couldn’t turn off and no terrain of thought was forbidding.

There is a cozy little shop in Spokane, Washington that smells of photoresist, solder and machining coolant oil where that happens every day.

NLIWhen I was there from 2001 through 2003 we had just enough contractual work to  produce just enough surplus energy to get the next contract.  But the culture there placed such a high value on creative and innovative approaches that it was the funnest place I’ve ever worked at.

The principal (seated on the right) is the president of the company who holds several patents including several very successful patents in holography.

One of the ideas he tried to patent was an electronic sensor of oligonucleotides based on two facts: The different weight of the base pairs in a single strand of DNA and the fact that there exists a resonant frequency for any oscillating body.

My work involved preparing gold plated test slides for attaching the 5′ end of oligonucleotides of known composition.  When a complimentary nucleotide bonded with this, it could be attached to the sensor and then separated by heating and tested for its composition.

Each sensor cell consisted of a gold foil diaphragm that would be set to oscillating by a frequency generator with reflected light measuring the degree of deformation of the diaphragm.  The frequency that took the least energy to maintain would be the resonant frequency of that cell of the sensor.

Adding weight to the cell would change that frequency.

Unfortunately someone else was awarded this patent first and the proof of concept development stopped.

Strange that.  Why is it that every time I join efforts with really creative people, I end up building the ACME widget that ends up with Wiley Coyote at the bottom of a grand canyon?