Lenox Laser Flow Certifications


Our methods of testing and calculating are new and unique. Our testing methods and our calculating methods will be described in a three page description included with this explanation.

Basically all test methods described depend on comparing a part being tested to one of our standards. We have over one-hundred standards which were developed by test method number one. While developing standards a certified digital test gauge that reads in absolute pressures was used to establish and maintain 29.7 P.S.I.A. To establish water volume in the tube or tubes between the lower and upper photocells, water was carefully poured into the system (using an eye dropper), until the lower light came on. Further water was added until the upper light came on. The water added was measured in graduate cylinders and also weighed on a digital scale that read to the thousand of a gram. These volumes with the computer measured time to go from the lower to the upper photocell provided the information to calculate the flow rates and the flow diameters. All tests to establish standards were run a minimum of five times.

In the past, we have sent a few standards to N.I.S.T. test facility for comparison. The first few were midsized and compared within ½ of a percent. The next time we sent some near 5 microns in size and they were found to be approximately ten percent to large. We then sent the same orifices to another N.I.S.T. test facility and they found them to be approximately ten percent too small. They guarantee their test to be within plus or minus seven percent.

We have many repeat customers that have found our work satisfactory over the years. Some of these customers are large and have very sophisticated test equipment of their own. Among these customers is Sandia who gives our quality system an SPQR 1050 certified rating.

All of our standards are re-calibrated yearly. When calibrating parts for customers two separate standards are use to orient the computer. If there is any discrepancy, further testing and checking follows to determine the cause of the problem.
A Lenox Laser certification means we have tested your parts to meet our standards and procedure.

If you need further approval, you can purchase the orifices needed and send them the test facility of your choice.

For more Flow Calibration Certification services, please visit Lenox Lasers certification page.

Exciting Breakthrough- 0.5 micron (500 nm) Exact Leaks!


Lenox Laser has made exciting breakthroughs in the manufacturing processes of exact leaks!

Exact Leaks are calibrated microholes that are repeatedly and reliably generated in packages and/or other pharmaceutical and manufacturing goods.  These microholes are commonly used in integrity testing processes.

Lenox Laser’s new process allows the creation of 0.5 micron holes in a wide variety of materials; including plastics and metals.


0.5 Micron Hole
Please visit here: Services- Calibrated Micro-Leaks  on our website for more information.

Lenox Laser Scholarship- “Evaluation of UV LEDs for detection of atmospheric NO2 by photolysis- chemiluminescence”

Lockheed WP-3D Orion. From NOAA website
Lockheed WP-3D Orion. From NOAA website


Evaluation of ultraviolet light-emitting diodes for detection of atmospheric NO2 by photolysis- chemiluminescence
by Ilana B Pollack, Brian M Lerner, and Thomas B Ryerson

This article was accepted to Journal of Atmospheric Chemistry in February of this year, and it details an atmospheric study done in May and June of 2010. Lenox Laser made a total of 3 parts for their studies of different LED detections systems of NO2. For some key background information if one is not familiar, I highly recommend reading this article first:
Flourescence detection of atmospheric nitrogen dioxide using a blue light-emitting diode as an excitation source by Yutaka Matsumi et al. It is much more readable and understandable.

Basically, detection of NO2 in the atmosphere relates to the ozone levels in the atmosphere. Thus, scientists of the field are interested in better, more accurate, and cheaper ways to measure NO2. One of the most recent trends to do so is to use commercially available UV-LEDs in their systems. The systems already often use a UV light source of some kind because in the chemistry of NO2 and related molecules, they will emit light in the process. Atmospheric scientists use this property, called chemiluminescence, to measure the NO2 molecules. Chemiluminescence detection is called P-CL.

In this article, the authors tested 3 UV-LEDs against each other in the P-CL system as shown in the diagram below:

Fig 1 from the paper- schematic of instrumental configuration
Fig 1 from the paper- schematic of instrumental configuration

I recommend reading the article itself to fully understand the diagram and the process. However, this is where Lenox Laser and our calibrated orifices come in. The red section where it says 700um orifice is where our first orifice was used. This is the bypass inlet, and was used to set the sample flow rate and cell pressure for the entire system. They found that the Nichia LEDs were the best overall.

So for the second part of the test, they took the Nichia LEDs on board the NOAA WP-3D aircraft with the P-CL for “on the job” training in the CalNex study. They replaced the more expensive and complicated mass flow controllers were replaced with our critical orifices and mass flow meters. In the diagram above the two places are indicated by arrows in the blue and black section. Replacing the parts in the system did improve the quality, and, as stated in the conclusion, they “eliminate mechanical components with complex flow paths that degrade time response. Replacing mass flow controllers with critical orifices and mass flow meters further simplifies the sample flow path in these laboratory test.”

The NOAA WP-3D aircraft is the plane that flies into hurricanes to monitor and gather information. It took part in CalNex – a study by several universities and institutions of air quality and climate change on the west coast. Our parts were used on board and tested with the UV-LED systems during the study. They even went with the plane as it was briefly diverted from the study to the Gulf of Mexico during the oil spill.

So in conclusion, this research paper incorporates optics, chemistry, and biology with flow technologies, atmospheric studies, and research planes all together, with Lenox Laser parts in the middle of it all!

As always, check out our main website www.lenoxlaser.com to see more of what we do, as well as the rest of this blog. If you have any questions or input, email me at archives@lenoxlaser.com

Lenox Laser and NASA- Pioneering in Space

For 30 years, Lenox Laser has been involved in numerous NASA missions, providing quality parts and expertise. So in anticipation of our 30th anniversary, we have put together those missions which we have been involved in.


It is truly amazing that we have some of our parts out in distant space providing critical data about our universe.


Exoplanet conceptualization. Credit: NASA
Exoplanet conceptualization. Credit: NASA


Only a few years after its invention, the LASER was used in NASA’s pre-Moon landing missions in 1967. The founder of our company, Joseph d’Entremont, was involved in the laser testing and laser measuring of the distance of the Moon from Earth. He provided the backup system, which was successfully used after the primary contractor’s system failed. He recalls that the power of the return signal he received was somewhere between a giga or terawatt.

Hubble Space Telescope:
We have had several parts on Hubble over the years. Starting in 1981, Lenox Laser provided precision crosshair fiducials and slits for the Hubble Instruments. We then twice provided custom stainless steel discs with crosses- in 1989 and 1991.

Galileo Mission:
In 1985, Lenox Laser drilled precision holes in Hasteloy discs for the Galileo Mission to Jupiter. They were for the Helium Leak Detector on the spacecraft. Galileo spent 14 years in space-
7 to travel to Jupiter, and then 7 orbiting Jupiter and its moons.
Galileo was then intentionally crashed onto Jupiter at the end of its mission to prevent contamination.
Galileo spacecraft. Credit: NASA
Galileo spacecraft. Credit: NASA

Kepler Mission:
1999 brought us the unique and monumental task of making a custom Starfield Plate for the Kepler Mission. This then led to the design and production of another “starfield” in 2000 for NASA’s “Starfield” Project. The project is part of a system that can find orbiting bodies around distant astronomical bodies by detecting miniscule changes in light intensity.

Messenger Mission:
We then made High Power Ceramic Apertures for the Messenger Mission which were for spatial filtering. The Messenger, and our apertures, orbited Venus on the way to its goal Mercury, where it is currently gathering information about the planet. The parts were hand delivered to the NASA Goddard Space Flight Center.


Light echo from a star. Credit: NASA Hubble
Light echo from a star. Credit: NASA Hubble


Mercury Laser Altimeter Project:
In 2003, Lenox Laser provided flight quality Alumina and Macor apertures for NASA’s Mercury Laser Altimeter Project and the Space Lidar Technology Center.

STEREO Mission:
Most recently, we provided custom parts and consulting services for NASA’s STEREO project which is providing revolutionary views of the Sun. The consulting was in support of testing the focus setting of one of the instruments during satellite integration at the Goddard Space Flight Center. As a result, Lenox Laser was awarded NASA’s Instrument and Technology Division 2006 Contractor Team Spirit Award.

To read more about our pioneering with NASA and their missions, click through the following links:

General information
Hubble Space Telescope
Galileo Mission
Kepler Mission
Messenger Mission
STEREO Mission

Tighter Tolerances for Flow Control Components


At an ever increasing rate industry is requiring tighter tolerances on flow control components.  As a supplier of laser drilled orifices in a variety of components, Lenox Laser, Inc. has been meeting these tighter tolerance requirements for several years.  Incidentally, these very tight toleranced parts have been in high demand.  To accommodate this demand, Lenox Laser has developed proprietary processes that allow tolerances to be consistently held.  Tolerances can be as tight as +/-0.5% and +/-1% on a 10 micron or larger hole sizes.  Compare this to standard tolerances that typically range from +/-5% and larger with respect to the hole size (i.e. a 1 micron hole can have a standard tolerance of close to +/-50% depending upon the part material and thickness).  Often customers may need not just tighter tolerances on a nominal size but matched sets or pairs with tolerances of +/-1-2% of each other.  Integration of the laser process with its flow testing capabilities ensures repeatable results with higher yields.  Very tight tolerances can be held on most standard flow components we offer, as well as, customer supplied parts.  Visit our website or email sales@lenoxlaser.com for more information.

John Whelan joins Lenox Laser Team



John Whelan, joins the team of Lenox Laser, in the Quality Assurance team. Mr. Whelan has a varied and wide background in the mechanical trades, from aviation maintenance technology to assisting on the recent Washington D.C. metro rail car project.

Mr. Whelan’s expertise in machineable parts and assemblies will be a valuable addition to the Lenox Laser team. Mr. Whelan won service awards and medals for his work in the Republic of Vietnam for the United States of America. He was also a valued member of Ward Machineries assembly department, specializing in sub assemblies. He also assisted in the development of a railcar for AAI/CAF.