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greenTEG AG Switzerland: Thermal Sensing & Energy Harvesting
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greenTEG - Heat Flux Sensing and Energy Harvesting
greenTEG - Heat Flux Sensing and Energy Harvesting

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greenTEG AG Switzerland: Thermal Sensing & Energy Harvesting's posts

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Laser Technik Journal published our application report: Laser Power Monitoring for Improved Process Stability


http://onlinelibrary.wiley.com/doi/10.1002/latj.201790004/full


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A liquid-state thermal diode in which the thermal conduction changes through thermal expansion of metallic liquid to displace air was characterized with a gSKIN® Heat Flux Sensor.

The research has been published in the International Journal of Heat and Mass Transfer

Abstract

We demonstrate a liquid-state thermal diode in which the thermal conduction changes through thermal expansion of metallic liquid to displace air. The forward (high conduction) mode occurs when the liquid spans the diode to produce a highly conducting path. The reverse mode occurs when the hot side is adjacent to air in the diode. The air provides a large thermal resistance so that the liquid metal in the reverse mode is at a lower average temperature than in the forward mode, and thus the liquid does not span the diode. With a prototype device using mercury and air in a glass tube, we demonstrate that the thermal resistance between the forward and reverse modes can differ by a factor of two, giving a rectification coefficient of about one. The rectification occurs at a variety of temperatures, and increases with the temperature difference across the diode. A figure of merit for selection of the liquid is the product of the liquid’s thermal expansion coefficient and thermal conductivity. Mercury was chosen because of large values of both of these properties, and the ability to wet and de-wet a surface.

International Journal of Heat and Mass Transfer Volume 106, March 2017, Pages 741–744
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greenTEG AG exhibits innovative OEM laser power and position sensors at Photonics West 2017

greenTEG offers a wide range of innovative OEM laser power and position sensors for high-precision measurements in applications such as med-tech, cutting, welding, soldering, marking, and 3-D printing.

greenTEG AG will present an exciting new sensor for fiber laser applications to be launched in 2017. Be sure to visit us at Booth 4520 to learn more about our products and to enjoy a glass of excellent Swiss wine. We look forward to meeting you and discussing your application requirements!

A broad range of power and position sensing solutions

greenTEG’s product portfolio of laser power and position sensors (gRAY) includes bare-die laser OEM components, PCB-mounted, mounted, as well as housed sensors. Further innovations include a digital measurement head which compensates for thermally induced measurement errors.

All gRAY sensors are based on thermopile technology and detect laser light from the UV to the IR range up to powers of 100W. Compared to similar products, gRAY laser power sensors are in many applications faster, and, due to their compact design, easier to integrate into existing systems, for example directly in the laser source. greenTEG offers customers extensive possibilities for sensor integration in their applications. We work with our customers to turn their ideas into reality.

Sensing fiber laser power

A major trend in the laser industry are fiber lasers which will be the dominant technology for many applications in the future. greenTEG is currently working on sensors specifically tailored to the requirements when measuring the power of fiber-coupled light. The product will be announced at Photonics West 2017.

About greenTEG: providing Swiss quality products to a global customer base

greenTEG supplies a broad global customer base with its superior quality Swiss-made sensing products. A team of highly qualified specialists with backgrounds in engineering, material science, chemistry, physics, electrical engineering and sales work to provide customers not only with outstanding products, but also dedicated technical consulting and after-sales support. greenTEG develops and manufactures its products entirely at its headquarters in Zurich, Switzerland.



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TH Nürnberg builds a housing complex to test new building materials and other methods to further reduce energy consumption. greenTEG’s heat flux sensors are integrated into the wall construction to monitor the thermal behavior of a new type of insulation material.
Reducing energy consumption with innovative technologies

The housing complex consists of eight units designed as best-practice projects to demonstrate a sustainable energy supply of living quarters according to the Plusenergy-Standard. The aim of the project is to develop new technologies and methods which will surpass the current status-quo in thermal insulation, energy generation, energy storage and energy supply. Future housing projects and smaller industry operations shall profit from this new methods and technologies.
Thermal characterization of insulation materials with heat flux sensors

One focus of the project is to test a newly developed material with a very high insulation quality. This new material is fabricated on the basis of hydrophobic silicic acid which is then filled into bricks with a high insulation quality. To measure how the new material reacts under real conditions, the researchers integrated greenTEG’s heat flux sensors directly into the bricks and will then measure the thermal behavior.
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11/29/16
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