General operation specifications of the complete unit (Summary)

IR source
Beam Properties

Quasi-paralleler Strahl, gegeben durch einen 50 mm Parabolspiegel und einen ebenen Gegenreflektor
IR emitter Kanthal filament, in protecting atmosphere
Emissivity of the emitter ca. 95 %
Divergence of exiting beam +/- 15° half angle
Beam aperture 20 mm
Electrical specification of filament Ieff = 1.4 A, Ueff = 2.85 V, P = 4.0 W @ T = 1030° C
Intensity control of IR source Guidance of partial beam to a photo sensor (maximum response at 850 nm)
Dimensions Optical axis 60 mm above the ground plate Fixation on ground plate: 2 x M4 at 40 mm distance
Weight 400 g

 

Chopper
Chopper disc, working track One sector, radius of free opening: 21 mm / 6 mm
Chopper disk, controlling track 32 sectors at 26 mm/ 23 mm
Protection hood Free sector: 90°
Drive High precision DC motor
Dimensions Optical axis 60 mm above ground plate Fixation on ground plate: 2 x M4 at 30 mm distance
Weight 200 g

 

Controlling unit

Control of IR source

Pulse width control of the 4.8 V signal at 20 kHz via a Si photo sensor with integrated pre-amplifier
Stability of the chopper +/- 0.1 %
Operation without IR source Minimum current required by the internal power supply is guaranteed by a relay controlled circuit.
Protection of the filament The IR source can only be operated when the intensity control is plugged in correctly
Delay time of IR source Starting after 2 s, given by the relay.
Control of chopper 3 stage PLL circuits operating on the working and controlling tracks by an external TTL signal
Controlling range of chopper 7.0 Hz - 19.6 Hz
Delay time Starting after 30 s, given by the PLL control unit
Power 85 - 264 VAC or 120 - 370 VDC
Fuse 1.6 A fast, @ 250 V
Dimensions B x H x D (mm) 120 x 100 x 200
Weight 2.5 kg
Temperature Operation: 0 - 50° C ;