Veris-technologies VIS_NIR Spectrophotometer Probe - Operating Instru Manuel d'utilisateur télécharger pdf (Page 21)

OM17-P4000VIS-NIR

3-12

Setting Integration Time:

The integration time is the amount of time the spectrometers collect the spectral data for

averaging. It is important to have this set correctly because too much light will saturate

the spectrometer, while too little light won’t allow the full range of the detector to be

used. The integration time needs to be set before acquiring spectral data. This is

especially important for users switching between probe and shank modules as

the optics are different and the amount of light seen between each device varies.

Step 1: Open the Veris Spectrophotometer Software and start the system check. After

the first Dark and Reference measurements are stored, check the ref spectra display

(example shown below). The two peaks shown should be around 40000.00 counts.

The first peak is controlled by the oo int time, while the second peak is controlled by the

ham int time. If peaks are too high, then lower the integration time. If peaks are too low

then raise the integration time.

Step 2: Once it has been determined which way to move the integration time, exit the

software and open the acq_settings.txt file located in the C:\Veris directory.

0.010 12.000 5.000 8.000 0.150 0.150 0.300 0.150 2.000

Example of data stored in acq_settings.txt

The second value represents the ham int time,while the third value represents the oo int

time. Raise or lower these values then save the file, open the Veris Spectrophotometer

Software, run a dark and reference measurement, and then check these values again to

see how the peaks changed.

Example of ref spectra shown

in system check and acquisition

with correct integration time set.

Figure 27

Make sure to check the integration

time while going through the initial

setup of the instrument.

Ocean Optics Integration time

Hamamatsu Integration time

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 81 82

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Veris-technologies VIS_NIR Spectrophotometer Probe - Operating Instru Manuel d'utilisateur Page 21