Ophir Optronics Ltd QSR Manual Do Utilizador

 

The absorption of the various Ophir thermal absorbers can vary from disc to disc. 
Therefore, all Ophir absorbers are individually calibrated against NIST traceable 
standards. Ophir power/energy meters with the broadband or P type absorbers 
are individually calibrated by laser at several wavelengths against a NIST 
calibrated standard meter. The meter can be switched to give the exact 
calibration at the various wavelengths, for example, Argon, YAG, and where 
applicable, CO2.  

The EX type detector is calibrated by measuring the ratio of absorption in the 
UV to that at 515nm. In both cases, the total absorption is measured using an 
integrating sphere. The detector is then calibrated with an argon laser and given a 
correction factor from this ratio. 

The linearity of most Ophir thermal detectors is specified to be 1% over the 
specified power range of each particular instrument, and is periodically tested by 
Ophir.  

For models whose linearity is not tested over their entire range, samples are 
randomly chosen and periodically tested over their entire range. The test is 
performed with a high power laser that covers the entire detector range using a 
rear leak detector for comparison. The rear leak detector is a low power Ophir 
detector that has previously been tested for linearity. In all cases, the linearity of 
the detectors is traceable to electrical standards.