|Motor driven spectral slits
Width of the motor driven slits is continuously adjustable from 0 to 2.0 mm. The slit width control can be performed with a micrometric screw which is rotated by a stepping motor or manually. Therefore, the motor driven spectral slits provide a many-sided control. These slits control can be done either automatically or manually.
The embedded controller of the spectral device implements the slit stepper motor control via PC commands. There is a position sensor in the slit mechanism, which is used to determine the initial (closed) state of the slit blades. To connect a motor driven spectral slit to the embedded controller, a cable is available, which is con-nected to the appropriate connector on the body of the spectral device.
Also, the slit width control of motor driven slits can be performed manually with a micrometric screw which is placed on on the top of the slit housing. The same types of micrometric screws are used in manual and in motor driven slits, so the motor driven slit contro in manual mode is the same as for the manual slit – see below.
Due to the fact that the width control of a motor driven slit is made by many-side manner (either automatically or manually), it is necessary to consider the following features:
Fig.1. Motor driven spectral slits. Drawing.
Fig.2. Connection circuit
|Manual spectral slits
The slit width is driven with a micrometric screw manually.
|Width adjustment of manual slits
Width of a slit is slowly adjusted from 0 to 2.0 mm with use of a micrometric screw on the housing. Graduating mark of the micrometric screw is 0,002 mm (2 μм). Each full revolution of the knob corresponds to the opening width of a slit blades of 0,1 mm (100 μм). To increase the slit width, is is necessary to rotate the knob clockwise. To decrease the width, the direction should be counterclockwise. To install a new value of the slit width with the maximum accuracy, the value of width should be set by rotat-ing the screw clockwise (incrising width).
Therefore, in case you need to set the value of the slit width less than its current value, you must first close it to the value less than desired (of about 50 microns ,it is half a turn of the micrometer screw) , and then rotate the drum clockwise to set the desired slit width (see figure below).
The fully closed state of a slit blades corresponds to the position “0” on the knob of micrometric screw.
To avoid damage of the slit mechanism, you can not set the slit width less than 0 and more than 2.0 mm.
Fig.3. Manual spectral slit. Drawing.
Fig.4. Width adjustment of manul slits