A laser gyroscope or rotation sensor is an inertial measuring equipment to measure the rotational velocity in respect of an inertial reference system. A fiberoptic laser gyroscope has been designed based on the principle of R. Ulrich, which is derived of the Mach-Zehnder interferometer utilizing the Sagnac effect. Due to a rotation of the assembly, there is a time delay in two reverse travelling laser beams, which results in a phase shift. As a consequence thereof, the interference pattern detected with a photo diode is also shifted. The recorded data were processed with LabVIEW and then evaluated. The design of the first reciprocal laser gyroscope assembly was such, that phase shifts could be measured when it was subjected to fast rotations. The minimum resolution verified experimentally was 0.6rad/sec, at which the noise and the signal could still be separated. In a second step, the sensitivity was increased. The improvements were achieved by modifying the following: signal technique, optics and assembly. The application of the phase modulation with the Piezo-Cylinder provided improved results, as the sensor could be tuned to a new working point. The subsequent signal processing was performed with a Lock-in amplifier. With this feature, it was possible to detect the weak measurement signal within the broadband noise. An increase of resolution could be achieved with this modified assembly. All these modifications resulted in a substantially improved resolution of the rotational velocity of 0.0043rad/sec, which was verified by experiment. The assembly of the already in PA1 developed fiberoptic temperature sensor was further improved. Using the four-step technique the interference pattern was detected with photo diodes. The recorded data were processed with LabVIEW. Therefore, a complete measurement system could be developed with the ability to detect slow temperature changes.