French electric company selects IR camera
A
Cedip Infrared Systems product story
Edited by the Engineeringtalk editorial team
Mar 9, 2007
The DTG selected the Silver 420M IR camera to monitor the 88 bridges of diodes installed on the rotor of the principal alternator at its key 900MW power generation facility.
The General Technical Division (DTG) of the French Electricity company (EDF) has implemented several of Cedip Infra Red Systems' Silver 420M IR cameras to develop IR thermographic conditional maintenance methods for a number of its production sites.
Infra-red thermography has become an essential tool used to monitor and maintain key components and structures in the production, transport and distribution of electricity.
For such measurements, the infra-red cameras most often used are portable instruments, powered by long-life batteries and operating at a low speed of analysis (50Hz).
To detect temperature changes portable IR cameras often use an uncooled microbolometer sensor that offer best exposure time of 5ms.
However certain components within strategically important power generation facilities require instruments of higher performance.
The DTG selected the Silver 420M IR camera to monitor the 88 bridges of diodes installed on the rotor of the principal alternator at its key 900MW power generation facility.
The alternator diode bridges had to be measured at a linear velocity of greater than 125m/s.
To make these demanding measurements engineers at the DTG were able to exploit the capability of the Silver 420M to precisely set the frequency of analysis, to within a hundredth of a Hertz, so as to stroboscopically synchronise the camera with the rotation of the fast moving alternator components.
Offering outstanding sensitivity, only normally found in expensive IR cameras dedicated to RandD applications, the Silver 420M, was able to measure the very weak signals even given exposure times of just a few microseconds.
The Silver 420M is an affordable infra-red camera based upon high-performance IR array detectors that gain additional sensitivity from a proprietary cryogenic cooling system.
The camera delivers up to 100 images per second in the full-image mode and several thousand images per second in partial-image mode at a constant sensitivity of less than 20mK.
Top performance is achieved in the medium wavelength infra-red band (3 to 5um) with a resolution of 320x256 pixels.
For applications requiring portability the Silver 420M has a dedicated long-life battery pack and can be easily connected to a mini portable PC with a fast USB2 or Camlink connection to record thermal images.
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