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4 | Product description
D-R 290
43
reflector surface area. This simplifies adjustment and avoids measurement errors in
the event of thermal distortion of the surfaces on which the measuring head and re
flector are mounted.
Measurement
Comparison standard
Measuring section
Reflector
Zero point
reflector
Transmitter
Turntable plate
50% splitter mirror
Receiver
Fig. 4.2: Measurement
The inevitable intensity drift of the optical sensor (receiver) and the semiconductor
light source caused by ageing and temperature influences are compensated automati
cally by the device. For this purpose the modulated light from the super wide band di
ode is divided into a measuring light beam and a comparison light beam (see
). An optical receiver receives the measurement and comparative measure
ment beams alternately. The changeover between measuring light and comparison
light is achieved by a stepper motor which rotates the turntable plate (see
) so
that the light path to the reflector is blocked whilst the optical path to the comparison
standard is open. The difference between the two measurements represents the ac
tual effect of the ageing (of the lamp) and influence of the temperature.
Comparison measurement
Comparison standard
Measuring section
Reflector
Zero point
reflector
Transmitter
Turntable plate
50% splitter mirror
Receiver
Fig. 4.4: Comparison measurement
The comparison light beam passes through the integrated comparison path every 2
minutes for approx. 5 seconds. The value of the comparison light is digitised and
saved for the following measurement light period.
Fig. 4.3: Turntable plate
Содержание D-R 290
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Страница 18: ...1 General 18 D R 290 ...
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Страница 28: ...2 Safety 28 D R 290 ...
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Страница 38: ...3 Delivery 38 D R 290 ...
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Страница 60: ...4 Product description 60 D R 290 ...
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Страница 174: ...8 Maintenance 174 D R 290 ...
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Страница 177: ...9 Appendix D R 290 177 Appendix Measurement point questionnaire Fig 9 1 Measurement point questionnaire 1 9 9 1 ...
Страница 178: ...9 Appendix 178 D R 290 Fig 9 2 Measurement point questionnaire 2 ...
Страница 188: ...9 Appendix 188 D R 290 Fig 9 11 Dimensional diagram D TB 100 supply unit Dimensional diagram purge air unit D BL 9 3 7 ...
Страница 193: ...9 Appendix D R 290 193 Fig 9 18 Dimensional diagram weather protection cover control electronics protective device ...
Страница 194: ...9 Appendix 194 D R 290 ...
Страница 200: ...11 Index 200 D R 290 ...
Страница 202: ...GmbH Kollaustraße 105 22453 Hamburg Germany www durag com ...