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Double Pass Extinction
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Double Pass Extinction
 
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Double Pass Extinction

Double pass extinction is a transmissometer type for visibility, dust and opacity sensors. These transmissometers measure the extinction coefficient of the atmosphere, and are used to determine visual range. With double pass extinction, the light source and detector are on the same side of the stack in a unit called a transceiver. A special reflector (the retro reflector) is installed where the photocell would be in a single pass unit. The purpose of the retro reflector is to send the light back along the same path it took when coming across the stack. A half silvered mirror is placed in the light's path to reflect half of the returning light from the retro-reflector onto the detector. Because the light traverses the smoke twice, the unit is called a double pass system.

 


Products & Services
Opacity sensors, dust sensors and visibility sensors measure the amount of light transmitted through a sample.
UV and visible spectrometers measure the amount of ultraviolet (UV) and visible light transmitted or absorbed by a sample placed in the spectrometer.
Hot mirrors and cold mirrors are dichroic filters that have a sharp transition between rejecting and transmitting at the near-infrared-visible area of the spectrum.
Linear polarizers transmit light waves along one axis and absorb them along the other. The transmitting and absorbing axes of linear polarization are oriented at 90 degrees to each other.
Iris apertures are used to manually vary the intensity of light, and the angle of incidence, of a cone of light.
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Product Announcements
Teledyne Monitor Labs, Inc. - The Lighthawk- Model 560
Monitor Labs LightHawk Opacity/Dust Monitor offers advanced, patented and configurable technology for outstanding performance and reliability as an opacity, optical density or dust concentration... (read more)
Applied Neotech, Inc. - Coatings On Glass
Includes most dielectric films: anti-reflection coatings, high reflectors, partial reflectors, long-wave pass and short wave-pass filters, polarizing and non-polarizing filters, metal films: Al, Au,... (read more)
Renishaw - Ultra-Fast, 5-Axis Scanning, CMM Revolution
Inventor of touch-trigger probing, Renishaw again revolutionizes part inspection, creating a new system of breakthrough technologies that bring ultra-high-speed scanning to coordinate measuring... (read more)
Heraeus Noblelight, Inc. - Shortwave T3 NIR Infrared Halogen Lamp
Short wave T3 NIR Infrared Halogen Lamps from Heraeus are suited for situations requiring high temperatures in the shortest possible time. Because these Heraeus IR heaters are manufactured in standard... (read more)
Applied Neotech, Inc. - Coatings On Fiber Ends
The common coatings applied on fiber ends are anti-reflection coatings and metallic coatings. Our dielectric coatings can stand high laser power, and meet MIL-C-48497. (read more)
General Digital Corporation - Reflections on Reflections
Reflections from a display are a fact of life. By careful design of the display and installation, it is possible to produce a display with adequate luminance and contrast (for both specular and... (read more)
Heraeus Noblelight, Inc. - Infrared lamps: Shortwave T3
Short wave T3 Halogen Infrared Lamps from Heraeus Noblelight, Inc. Infrared lamps, Short wave T3 Halogen, Heraeus NIR lamps produces high output heat using argon or halogen technology. Featuring... (read more)
 
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Topics of Interest
Absorption: The portion of optical attenuation in an optical fiber resulting from the conversion of optical power to heat; caused by impurities such as hydroxyl ions in the fiber. A/B Switch: A... (Read More)
The term reflection actually encompasses three entirely different types of optical phenomena. These three kinds of reflection are specular reflection (like a mirror), diffuse reflection (often called... (Read More)
Inside an optek photometer, a precisely focused light beam is used to penetrate the process medium. A photoelectric silicon cell measures the resulting light intensity. The change in light intensity... (Read More)
Without sensors, a robot is just a machine. Robots need sensors to deduce what is happening in their world and to be able to react to changing situations. This section introduces a variety of robotic... (Read More)
Photoelectric smoke detectors contain a light and a sensor at 90-degree angles to one another. Normally, the light from the light source shoots straight across the device and misses the sensor. When... (Read More)
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See more product announcements for Visibility Sensors, Dust Sensors and Opacity Sensors
The Lighthawk- Model 560

The Lighthawk- Model 560
Teledyne Monitor Labs, Inc.


Piezobalance Dust Monitor Model 3521

Piezobalance Dust Monitor Model 3521
KANOMAX USA, INC.


Digital Aerosol Monitor Model 3431

Digital Aerosol Monitor Model 3431
KANOMAX USA, INC.


11 See more product announcements for Visibility Sensors, Dust Sensors and Opacity Sensors



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