Featured Research

from universities, journals, and other organizations

Shadow Technique Improves Measurement Of Micro Holes

Date:
June 13, 2005
Source:
National Institute of Standards and Technology (NIST)
Summary:
A new measurement method developed by researchers at the National Institute of Standards and Technology (NIST) uses the shadow cast by a small glass probe to infer the dimensions of tiny, microscale holes or other micrometer-sized components with an uncertainty of only 35 nanometers. The technique may provide an improved quality control method for measuring the interior dimensions of fuel nozzles, fiber optic connectors, biomedical stents, ink jet cartridges and other precision-engineered products.

NIST researchers and collaborators have developed a new method for measuring the interior dimensions of small holes with an uncertainty of only 35 nanometers. Here, a glass probe is inserted into an optical "ferrule," a device for connecting optical fibers used in communications systems.
Credit: Image courtesy of National Institute of Standards and Technology (NIST)

Sometimes seeing a shadow can be as good or better than seeing the real thing. A new measurement method* developed by researchers working at the National Institute of Standards and Technology (NIST) is a case in point. The method uses the shadow cast by a small glass probe to infer the dimensions of tiny, microscale holes or other micrometer-sized components. The technique may provide an improved quality control method for measuring the interior dimensions of fuel nozzles, fiber optic connectors, biomedical stents, ink jet cartridges and other precision-engineered products.

Related Articles


Designed to be implemented with the type of coordinate measuring machine (CMM) routinely used in precision manufacturing settings, the method uses a flexible glass fiber with a microsphere attached on one end. The glass probe is attached to the CMM's positioning system, inserted into the part to be measured, and systematically touched to the part's interior walls in multiple locations. A light-emitting diode is used to illuminate the glass fiber. While the microsphere inside the part is not visible, the shadow of the attached fiber--with a bright band of light at its center--shows the amount of deflection in the probe each time the part's interior is touched. A camera records the shadow positions. Based on prior calibration of the force required to bend the probe a specific distance, the part's dimensions can be determined with an uncertainty of about 35 nanometers (nm). The method can be used for holes as small as 100 micrometers in diameter.

"Our probe has a much smaller measurement uncertainty than other available methods and it is very cost effective to make," says Bala Muralikrishnan, a NIST guest researcher from the University of North Carolina at Charlotte.

The thin, glass fiber is about 20 millimeters long and 50 micrometers in diameter, making it especially useful for measuring relatively deep holes not easily measured with other methods. Replacement probes cost about $100 compared to about $1,000 for those manufactured using silicon micromachining techniques.

###

*B. Muralikrishnan, J.A. Stone and J. R. Stoup. Measuring internal geometry of fiber ferrules. Presented at the SME MicroManufacturing Conference, Minneapolis, Minn., May 4-5, 2005.


Story Source:

The above story is based on materials provided by National Institute of Standards and Technology (NIST). Note: Materials may be edited for content and length.


Cite This Page:

National Institute of Standards and Technology (NIST). "Shadow Technique Improves Measurement Of Micro Holes." ScienceDaily. ScienceDaily, 13 June 2005. <www.sciencedaily.com/releases/2005/06/050613063251.htm>.
National Institute of Standards and Technology (NIST). (2005, June 13). Shadow Technique Improves Measurement Of Micro Holes. ScienceDaily. Retrieved February 1, 2015 from www.sciencedaily.com/releases/2005/06/050613063251.htm
National Institute of Standards and Technology (NIST). "Shadow Technique Improves Measurement Of Micro Holes." ScienceDaily. www.sciencedaily.com/releases/2005/06/050613063251.htm (accessed February 1, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Sunday, February 1, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Russian Pilot Recalls Successful Balloon Flight

Russian Pilot Recalls Successful Balloon Flight

AP (Feb. 1, 2015) American Troy Bradley and Russian Leonid Tiukhtyaev landed a helium-filled balloon four miles offshore in Baja California Sur. (Feb. 1) Video provided by AP
Powered by NewsLook.com
Smart Glasses Augment Reality to Help Visually Impaired

Smart Glasses Augment Reality to Help Visually Impaired

Reuters - Innovations Video Online (Feb. 1, 2015) New augmented reality smart glasses developed by researchers at Oxford University can help people with visual impairments improve their vision by providing depth-based feedback, allowing users to "see" better. Joel Flynn reports. Video provided by Reuters
Powered by NewsLook.com
Madrid’s LED Bulbs Are Street Lights That Save

Madrid’s LED Bulbs Are Street Lights That Save

Reuters - Innovations Video Online (Feb. 1, 2015) Madrid swaps its street light system with LED technology in the largest urban street lighting replacement plan in the world. Tara Cleary reports. Video provided by Reuters
Powered by NewsLook.com
Nanoscale Sensor Could Help Wine Producers and Clinical Scientists

Nanoscale Sensor Could Help Wine Producers and Clinical Scientists

Reuters - Innovations Video Online (Jan. 30, 2015) A nanosensor that mimics the oral effects and sensations of drinking wine has been developed by Danish and Portuguese researchers. Jim Drury saw it in operation. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins