1. A system for optical measurement of a target at several positions, the system comprising:
at least one detector configured to receive a measurement radiation beam from or through the target;
at least one Fabry-Perot interferometer within the path of the measurement radiation beam; and
first optical fibers configured to guide radiation from several positions of the target to the at least one detector, the at least one Fabry-Perot interferometer being located between the optical fibers and the at least one detector in order to simultaneously filter radiation received from the several positions of the target via several optical fibers,
wherein the at least one detector is a row detector which has several adjacent detector elements in line,
each of the optical fibers guide radiation from one determined position of the target to one determined detector element of the at least one detector, and
a plurality of the optical fibers are connected at ends thereof to a common slit which directs the measurement radiation beams from the ends of the fibers through the at least one Fabry-Perot interferometer to the detector elements.
2. The system according to claim 1, further comprising:
a radiation source; and
second optical fibers configured to guide radiation from the radiation source to several positions of the target.
3. The system according to claim 2, further comprising an additional Fabry-Perot interferometer between the radiation source and the second optical fibers, the additional Fabry-Perot interferometer being configured to filter radiation illuminating the several positions of the target.
4. The system according to claim 1, further comprising means for providing radiation received from the target position into first and second radiation beams,
wherein the at least one Fabry-Perot interferometer includes a first Fabry-Perot interferometer and a second Fabry-Perot interferometer, and the at least one detector includes a first detector and a second detector,
the first Fabry-Perot interferometer and the first detector measure a first spectral component of the first radiation beam, and
the second Fabry-Perot interferometer and the second detector measure a second spectral component of the second radiation beam.
5. The system according to claim 4, wherein said means for providing first and second radiation beams from one target position is a beam splitter.
6. The system according to claim 1, further comprising a radiation source configured to illuminate the target with an illuminating radiation beam.
7. The system according to claim 6, further comprising an additional Fabry-Perot interferometer within the path of the illuminating radiation beam.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An image forming apparatus comprising:
a fixing device, which fixes a toner image formed on a sheet to the sheet while transporting the sheet upward;
a delivery roller, which delivers the sheet, on which the toner image is fixed by said fixing device, to a delivery space, wherein sheets delivered by said delivery roller are stacked in the delivery space;
a fan, which exhausts air in the vicinity of said fixing device and air in the delivery space to outside of a main body of said image forming apparatus;
a first air vent provided between said fixing device and said fan;
a second air vent provided in a wall of the main body;
an exhaust opening provided in the main body; and
a reader unit, which reads an image of a document,
wherein the wall of the main body and a lower surface of said reader unit define the delivery space,
wherein said fan exhausts the air in the vicinity of said fixing device from said exhaust opening through said first air vent, and takes the air in the delivery space into the main body through said second air vent to exhaust the air in the delivery space from said exhaust opening, and
wherein said fan is provided between said second air vent and said exhaust opening and on the same level as said second air vent and said exhaust opening.
2. An image forming apparatus comprising:
a fixing device, which fixes a toner image formed on a sheet to the sheet while transporting the sheet upward;
a delivery roller, which delivers the sheet, on which the toner image is fixed by said fixing device, to a delivery space, wherein sheets delivered by said delivery roller are stacked in the delivery space;
a fan, which exhausts air in the vicinity of said fixing device and air in the delivery space to outside of a main body of said image forming apparatus;
a first air vent provided between said fixing device and said fan;
a second air vent provided in a wall of the main body;
an exhaust opening provided in the main body; and
a reader unit, which reads an image of a document,
a guide, which guides the sheet from said fixing device to said delivery roller,
wherein the wall of the main body and a lower surface of said reader unit define the delivery space, and
wherein said fan exhausts the air in the vicinity of said fixing device from said exhaust opening through said first air vent, and takes the air in the delivery space into the main body through said second air vent to exhaust the air in the delivery space from said exhaust opening, and
wherein said fan is provided opposite to the delivery space with said guide interposed between said fan and the delivery space.