Abstract: A magnetostrictive transducer including a plurality of magnetostrictive laminates each having a first end and a second end. The first and second ends of the laminates include openings. The laminates are arranged in a stacked configuration and bonded together by solder at the first and second ends. At the first and second ends the solder extends through the openings of the laminates forming a solder bar therein. The solder bars bond the laminates together with increased mechanical strength and also provide increased electrical contact between the laminates.

Abstract: A fiber optic light detector for determining the light intensity of a light emitted from a light source. The device includes a photocell, a light intensity display and two stationary pegs. The two pegs are spacedly positioned about the periphery of the photocell. When measuring light intensity, a fiber optic bundle illuminated by a light source is positioned to cover the photocell and be in contact with both of the two pegs. When the light source is positioned in this manner, complete coverage of the photocell is ensured regardless of the size of the fiber optic bundle. The light intensity display displays the digital value of the intensity determined by the photocell. The light detector is also adapted for connection and concurrent operation with a light source, i.e. a curing light.

Abstract: An alternating current voltage regulator providing a stable RMS output voltage across a load. The voltage applied to the load being determined by controlling the firing angle of a triac, which is controlled by the pulse width of a timing signal generated in a timer circuit. The pulse width of the timing signal is controlled by an error signal. The error signal is based upon the actual triac output voltage as compared with a comparison signal. The voltage delivered to the load is compared with a RMS reference voltage to produce the comparison signal. The potential difference between the output voltage and the comparison signal is constantly monitored to produce the error signal. The error signal is thus constantly applied to vary the pulse width of the timing signal and thus vary the firing angle of the triac in accordance with the deviation of the actual output voltage from the stable RMS reference voltage.