The picture displayed on the monitor is equivalent to what one would see when looking directly through the theodolite.
Other equipment needed for operation of the camera are power supplies, cables, and a black-and-white television monitor. An interface adaptor was designed and fabricated to mount the camera onto the eyepiece of the specific theodolite s viewing telescope. It is a small, inexpensive, blackand- white CCD circuit-board-level camera. The CCD camera is already commercially available. If one chooses insufficient attenuation or forgets to use the filters, then looking at the laser beam through the theodolite could cause instant blindness. This method for a Class ll visible wavelength laser is not acceptable to even consider tempting for a Class IV laser and not applicable for an infrared (IR) laser. One could then safely view and measure the laser s boresight looking through the theodolite s telescope without great risk to one s eyes. When measuring the angular pointing direction of a Class ll laser with a theodolite, one could place a calculated amount of neutral density (ND) filters in front of the theodolite s telescope. A theodolite is an alignment telescope equipped with mechanisms to measure the azimuth and elevation angles to the sub-arcsecond level. The present state of the art requires this to be a custom addition because theodolites are manufactured without CCD cameras as standard or even optional equipment. The simple addition of a charge-coupled-device (CCD) camera to a theodolite makes it safe to measure the pointing direction of a laser beam. Theodolite with CCD Camera for Safe Measurement of Laser-Beam Pointing The aromatic rings are approximately perpendicular to each other, forming a dihedral angle of 78.31 sh H⋯O hydrogen bonds and C-H⋯π inter-actions help to consolidate the three-dimensional network. The carbonyl, aryl and O-CH( 2)-CH( 2) groups are almost coplanar, with an r.m.s. In the crystal, the mol-ecule lies on a twofold rotation axis that passes through the central O atom of the aliphatic chain, thus leading to one half-mol-ecule being present per asymmetric unit.
The title compound, C(18)H(18)O(5), was obtained by the reaction of 4-hy-droxy-benzaldehyde with bis-( 2,2-dichloro- eth-yl) ether in dimethyl-formamide.
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