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7.3 Optical Spectral Measurements
This example will show how to measure a spectral diagram of any light source. You need an optical chopper (such
as SIGNAL RECOVERY MODEL 197 Light Chopper), a grating monochromator (such as WDG15-Z) and its
control system, a photoelectric detector (such as the S286 series photodiode of Japan Hamamatsu Company), a data
collection platform (such as NI cDAQ-9172) and a PC. You should control the monochromator to sweep
automatically in the spectral measurement range. Then measure the photo current by the SE1201. The steps are as
follows:
1. Disconnect all cables from the lock-in. Connect the power source and then turn on the power switch. The system
is in default.
2. Set the corresponding parameters of SE1201.
(1) Press [INPUT/FILTERS] and then set the input mode to <I> and <Amplitude: 1M>. Other settings remain the
default.
(2) Press [REF/PHASE] and then set <Ref. Source: External> and <Type: TTL>.
(3) Press [GAIN/TC] and then set <Sensitivity: 1μA> which can be adjusted in measurement, <Reserve: Normal>,
<TC: 300ms> and <Roll off: 12dB/oct>. Finally, turn off the SYNC filter.
(4) Press [OUTPUT/OFFSET] and then set <CH1>, <Source: R> and <Speed: Fast>.
3. Build up the spectral measurement platform.
Use a BNC cable to connect the output of the photoelectric detector and the A/I input of the SE1201.
Use a BNC cable to connect the Sync out f1 of the optical chopper and the REF IN of the SE1201.
Use a BNC cable to connect the data collection platform and the CH1 OUT of the SE1201. The sketch is shown in
Fig.68.
The actual connect figure is shown in Fig.69.
Fig.68 Spectral Measurement Platform Diagram