Sofradir EC Thermal Imaging Cameras
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Range, Resolution and FOV Calculator
Determine the optimum camera and lens combination for your application.
Camera Selection
Camera Model
Pixel pitch (µm)
H (µm)
V (µm)

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Number of Pixels
Detector Size (mm)
Field of View
Lens focal length mm
Field of View (FOV) (degrees) °
Pixel Field of View (IFOV) (mrad)
Range Parameters
Range to object meters
Field of View at Range (meters)
Pixel Field of View at Range (cm)
Detection Range
H-Size of object meters
Max Detection Range (2 pixels)
% of display
Range (meters)
% of H display
Max Recognition Range (8 pixels)
% of display
Range (meters)
% of H display
Max Identification Range(13 pixels)% of display
Range (meters)
% of H display
Infrared Camera Description and Historical Information
This Infrared Camera Range Calculator enables the user to easily estimate the maximum range from which an object can be detected when using various infrared camera platforms. It is important to note that these estimates assume that range performance is based solely on image quality yielding a method of estimation that's simple to implement. The estimates are based solely on the object size, distance, camera objective lens and camera detector parameters. Object temperature, emissivity, atmospheric conditions, reflectivity and other factors are not considered. In this regard, the object size and focal length of the objective lens are variables to be entered by the user. The spreadsheet also provides information as to the angular and spatial field-of-view of different camera systems at a specified range.
The calculations used here are based on the "Johnson Criteria" which were developed many years ago by John Johnson, a scientist at the US Army Night Vision Lab (Night Vision & Electronic Sensors Directorate). Johnson was working to develop methods of predicting target detection, recognition, and identification. He was working with volunteer observers using image intensifier equipment and quantified the volunteer observer's ability to identify scale model targets under various conditions. His experiments produced the first empirical data on perceptual thresholds. The so-called Johnson Criteria have been the basis for many models that predict the performance of sensor systems under different environmental and operational conditions. According to the Johnson Criteria, the minimum resolution (pixels on target) required to achieve a 50% probability that an observer can discriminate an object at a certain range to the specified level are:
  • Detection - an object is present: 2 +1/-0.5 pixels
  • Recognition - the type object can be discerned, a person vs. a car: 8 +1.6/-0.4 pixels
  • Identification - a specific object can be discerned, a woman vs. a man, the specific car: 12.8 +3.2/-2.8 pixels
IRE Family of Cooled IR Imaging Cameras:

These high performance infrared imaging cameras are based on cryogenically cooled MCT infrared detectors. A variety of models are available having different ranges of spectral sensitivity and different array formats. The cameras harness the full performance of the Sofradir IDDCAs while offering unique flexibility such as variable frame rate and integration time, sub-windowing at higher frame rates, radiometric calibration and IRIG time stamp capability. The 14-bit digital data can be streamed via LVDS or through optional Camera Link and/or Gigabit Ethernet. A variety of infrared lenses are available as well as software developer toolkits (SDKs) and command software modules.

High Resolution
IR Cameras:
ATOM 1024 and PV640

The ATOM 1024 and PV640 uncooled infrared cameras incorporate high resolution microbolometer arrays with 1024x768 and 640x480 pixels, respectively. The cameras feature a short thermal time constant that results in superior thermal image quality even while imaging fast moving objects. In addition, despite their small compact size and low power consumption, these cameras deliver excellent image quality and are easy to integrate into a wide range of COTS thermal imaging systems. Desktop software permits the acquisition of frames and sequences as well as standard image processing capabilities.

Learn more

We hope this information is helpful. Feel free to email us with comments.

Disclaimer: We have made every attempt to provide accurate information. However, we cannot accept any responsibility for errors or inaccuracies. Should you require assistance, please contact us directly. Thank you.
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Sofradir EC (formerly Electrophysics) Thermal Imaging Cameras
Sofradir-EC, Inc.  Thermal Imaging Cameras  (formerly Electrophysics Corp.)
373 US Hwy 46W  Fairfield, NJ 07004 USA  |  Phone: 973-882-0211  |  Fax: 973-882-0997  |