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The calibration accuracy of the measuring sensor at the power level, energy level and wavelength at which it was calibrated. The energy calibration error, i. This is of concern only for thermal sensors 3. The wavelength dependence of the sensor, i.
The linearity of the sensor, i. The uniformity of reading over the surface, i.
The pulse rate dependence in the case of pyroelectric sensors, i. The calibration accuracy of the display unit. Damage done to the absorber surface 9. Electromagnetic interference Before focusing on 1 and 2the primary subject of this document, we will go over the other factors in measurement accuracy.
For this reason, Ophir measuring sensors are usually calibrated at more than one wavelength. In that case, the error in measurement between the wavelength the device was calibrated for and the measurement wavelength is assumed to be within the primary wavelength calibration error.
In that case, the error in measurement between the wavelength the device was calibrated at and the various other wavelengths in the defined wavelength region is taken into account in the total error budget.
The linearity of Ophir sensors is always given in the published specification for thermal and pyroelectric sensors and the expected error due to nonlinearity is to be added to the basic calibration error as discussed below.
Pulse Rate and Pulse Width: Pyroelectric sensors have some pulse rate dependence. Near the maximum pulse rate you can expect the error to be near the maximum stated.
Ophir design pyroelectric sensors have little pulse width dependence so this can usually be ignored. Damage Done to the Absorber Surface: Damage done to the absorber surface can effect the reading if the damage causes the absorption to change. One way to check this is to move the beam slightly away from the damaged area and to see if and how much the reading changes.
Ophir meters and sensors are certified to meet CE requirements for susceptibility to and emission of electromagnetic radiation.
At almost all frequencies of radiation of strength up to the limit prescribed by CE, one will not notice any interference. In rare cases, at specific frequencies, there may be some noticeable interference. We have specified the maximum interference that may be seen at any frequency to be less than 0.
The total expected error will be in the worst case, the sum of the various contributing errors. Note that if a sensor is sent for recalibration, then a significant number of sensors can show variation between the first and second calibration more than the stated error.Are you financing or structuring public-private partnerships in infrastructure?
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