Shimadzu RF-20A - Page 41

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11. Movement of the excitation-side grating to the 507 nm position
The excitation-side grating is gradually rotated from near 500 nm slightly below 507 nm for the
low-pressure Hg (Mercury) lamp, and the light intensity peak is recorded by the emission-side
light sensor.
12. Calculation of rotation angle required for movement of the excitation-side grating to the
507 nm position
The rotation angle required for movement of the excitation-side grating to the 507 nm position
from the home position is calculated.
13. Movement of the excitation-side grating to the 761 nm position
The excitation-side grating is gradually rotated from near 755 nm slightly below 761 nm for the
low-pressure Hg (Mercury) lamp, and the light intensity peak is recorded by the emission-side
light sensor.
14. Calculation of rotation angle required for movement of the excitation-side grating to the
761 nm position
The rotation angle required for movement of the excitation-side grating to the 761 nm position
from the home position is calculated.
15. Movement of the emission-side grating to the 507 nm position
The excitation-side grating is aligned with the 254 nm position determined in 7. Next, the
emission-side grating is gradually rotated from near 500 nm slightly below 507 nm for the low-
pressure Hg (Mercury) lamp, and the light intensity peak is recorded by the emission-side light
sensor.
16. Calculation of rotation angle required for movement of the emission-side grating to the
507 nm position
The rotation angle required for movement of the emission-side grating to the 507 nm position
from the home position is calculated.
17. Movement of the emission-side grating to the 761 nm position
The excitation-side grating is aligned with the 254 nm position determined in 7. Next, the
emission-side grating is gradually rotated from near 755 nm slightly below 761 nm for the low-
pressure Hg (Mercury) lamp, and the light intensity peak is recorded by the emission-side light
sensor.
18. Calculation of rotation angle required for movement of the emission-side grating to the
761 nm position
The rotation angle required for movement of the emission-side grating to the 761 nm position
from the home position is calculated.
19. Determination of span correction coefficient (S value)
The excitation-side and emission-side span correction coefficients (S values) are calculated
using the ratio between the design angle of rotation between 0 to 761 nm and the rotation
angle of the grating at respective wavelengths calculated on the excitation and emission
sides. The design values are compensated by the span correction coefficient (S value)
recorded here, and the angles of rotation of the grating for each wavelength set at
measurement are automatically determined.
No
EX
EM
No
EX
EM
1
HP Peak detection
HP Peak detection
11
507nm Scan
254nm
2
254nm Peak detection
12
507nm Calculaed
3
254nm
0nm Scan
13
761nm Scan
254nm
4
0nm Calculaed
14
761nm Calculaed
5
254nm
254nm Scan
15
254nm
507nm Scan
6
254nm Calculaed
16
507nm Calculaed
7
254nm Scan
254nm
17
254nm
761nm Scan
8
254nm Calculaed
18
761nm Calculaed
9
0nm Scan
254nm
19
Calculaed of S value
10
0nm Calculaed