EXP-02 Detection of Light

Topics

White Light Lamp
Prism Refractometer
Black Body Radiation
Si Photo Detector
InGaAs Photo Detector
Thermoelectric Detector
Photometer
Spectral Characterisation


Principle of operation

The light source (LS) generates white light by means of a halogen lamp. The light is collected with a concave mirror and focused into a glass fibre bundle (FB) whose cross section varies from a circular shape at the entrance to a rectangular slit at its exit. The cylindrical lens (L1) collimates the emerging light from the exit to a parallel slit image entering the set of prisms. To fully illuminate the sensitive area of the object (T) a set of two identically cylindrical lenses (L2 and L3) is used. The selection of the wavelength is achieved by tilting the set of prisms (P1) through (P3). The three prisms configuration (Försterling arrangement) has the advantage that the prisms are used in the minimum of beam deviation and the exit beam stays constant under 90° with respect to the optical axis of the incoming beam. The prism (P4) is used to bend the beam back to the optical axis of the set-up. The prisms (P1 and P3) are responsible for the guidance of the beam and prism (P2) for the wavelength separation. The shape of (P2) corresponds to the well known Abbe type. Behind the prism monochromator, the light chopper (CH) is arranged in such a way that it can be used to investigate the time response of a particular detector. In addition, the chopper will be used in connection with the subsequent detection system to eliminate the influence of disturbing environmental light.
 
 


Required Equipment

Cat. No.    Qty.     Description
02.1000    1         Profile Rail, 1000 mm
02.2052    1         Mounting plate, 50, carrier 20
02.2126    1         Mounting plate, click 25, carrier 20
02.2202    1         Filter plate holder for 3 filters, carrier 30
04.0124    1         Coloured glass filter, BG-39
05.0102    1         White light source 150 W, 21 V
07.0114    1         Photodetector, wavelength independent, calibrated
07.0116    1         Photodiode, K1, Si, in housing
07.0118    1         Photodiode, K2, Si PIN, in housing
07.0120    1         Photodiode, K3, InGaAs, in housing
07.0208    1         Precision power supply
07.0212    1         Photodiode amplifier PDA-10
07.0226    1         Light-chopper controller LCC-01
09.0022    1         Imaging optics, fibre bundle
09.0024    1         Tunable wavelength selector
09.0026    1         Imaging cylindrical optics
09.0076    1         Light chopper, carrier 60
10.0020    1         EXP 02 manual
Options:              
09.0029    1         Set of spare parts
19.0140    1         Dual trace oscilloscope 100 MHz