The field of view and other important characteristics of the imager, BALTECH

Ár / bérleti díj: 10 000 Ft (HUF)

Rovat: Műszaki cikk, elektronika » Egyéb

Elhelyezkedés: Külföld, Németország, Lübeck | Térkép Megtekintés térképen

A hirdetés feladásának ideje: 2017. 12. 20. 14:23

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The field of view and other important characteristics of the imager, BALTECH

The imaging, allowing diagnosis at a distance are the optimal tool for non-destructive thermal control in different industries.

These devices are especially popular for:

• Thermal audit of construction projects;

• Detection of defects of the power grid;

• Monitoring of production processes, etc.

Using the device you can get a picture of the inhomogeneity of the thermal field of the object and judge its condition. Quickly identifying potentially problematic areas, you can perform preventive maintenance and reduce total operating costs.

However, choosing the imager to work, you must purchase the device most suitable for your needs. Look at the main parameters of the thermal imaging camera.

 

The resolution matrix

Under the resolution of the matrix is the number of its sensitive elements. This is the most important element of the device. Is the number of sensitive elements (horizontal, vertical) depends on the clarity of the resulting images.

If the device is equipped with a high resolution matrix, you can easily determine the point with maximum temperature and minimum temperature indicator. However, such a matrix will increase the cost of the imager by almost half.

The field of view

 

Under the field of view (FOV) refers to the angular space that is available the lens measuring instrument, i.e., the imager "sees" it. Largest FOV possible to calculate the working distance for examination of the subject a predetermined value. If the field of vision denote by a, the height of the object h, the working distance (l) when the frame is in an upright position, calculated by the formula:

 

l=h/tg a.

 

To increase this setting, use the wide angle lens. If you want to measure objects at a long distance, use a telephoto lens. In thermography are standard lenses, telephoto lenses and wide angle lenses with a field of view, respectively, 20-40°, 5-15°, 45-90°.

Spatial resolution

 

Under this resolution (iFOV) refers to the size of the smallest display of the object, expressed in milliradians. If l is the distance to the studied object, and δ is the spatial resolution (radians) linear size of the smallest display object is calculated as:

 

h= l*δ,

 

Example. Spatial resolution lens of 3.5 mrad. The distance to the measured object is 1 m. Therefore, the smallest visible object will have a size of 3.5 mm and displayed on the screen of the imager in a single pixel.

Temperature sensitivity

 

Under thermal sensitivity (NETD) is the smallest temperature difference, defined within a single pixel. The value is expressed in Kelvins or degrees Celsius.

 

Simple and cheap devices it is 0.15, professional devices – less than 0,035 OS.

 

Frame rate

The speed of the changing images on the display device is called the frame rate and is expressed in Hertz. If the operator notices a change of image, so the frame rate is low (9 Hz) value. Given that the operator will work for a long time, constantly on the move, and the change will be changed regularly, it is recommended that a device having a frame rate of 50/60 Hz.

 

The higher the refresh rate of the picture, the less tired eyes specialist and more comfortable with his work, especially long surveys.

 

The company Baltech offers a simple and inexpensive thermal imaging cameras BALTECH TR series are certified in Russia, Germany and Kazakhstan.

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