Nanoindenter provides an approach for assessing mechanical properties in micro-electronics devices and films based on
quantitative, controlled nanoindentation of surfaces, with the convenience of modern automation. It is also suitable to
measure mechanical properties of biomaterials. Nanoindenter for biomaterial testing in bone and dentin was widely used.
Recently some studies of nanoindentation properties in insect were carried out. While the surface roughness of natural
biomaterials problem should not to be ignored in nanoindentation testing. The surface roughness will critically affect the
precision of result of nanoindentation testing and caused error data. In this paper, the biomaterials specimen preparation
methods for nanoindentation testing will be reviewed.
In order to improve the ground viability of missile weapon system, a quick orienting and aiming instrument is cried for the missile launching in modern war. The fiber optic gyroscope (FOG) based on Sagnac effect is a new type of all solid state rotation rate sensor that detects angular changes or angular rates relative to inertial space, which has many fine characteristics compared with traditional mechanical electronic gyro, such as low cost, light weight, long life, high reliability, wide dynamic range, etc. For the need of missile photoelectric aiming facility, It is necessary to design and manufacture a set of orienting and aiming instrument based on single axis FOG, to solve the close quarters aiming of missile launching, to measure the azimuth reference. Based on practical project, the principle of FOG orienting system and laser collimation theodolite aiming system is discussed and studied in this paper. Orienting and aiming system are constructed in the same basement. The influence of platform tilt on the precision of orientation is analyzed. An accelerator is used to compensate deviation caused by base tilt. The aiming precision affected by eccentricity of the encoders for laser collimation theodolite and the FOG orientation system are analyzed. The test results show that the aiming accuracy is 6' in three minutes. It is suitable for missile aiming in short range.
High speed photograph measuring instrument is mainly used to measure and track the exterior ballistics, which can
measure the flying position of the missile in the initial phase and trajectory. A new high speed photograph measuring
instrument is presented in this paper. High speed photography measuring system records the parameters of object
real-time, and then acquires the flying position and trajectory data of the missile in the initial phase. The detection
distance of high speed photography is more than 4.5km, and the least detection distance is 450m, under the condition of
well-balanced angular velocity and angular acceleration, program pilot track error less than 5'. This instrument also can
measure and record the flying trail and trajectory parameters of plane's aero naval missile.
North-finder system is an important application of the inertial technology. It provides true north azimuth information to all kinds of ground-based equipment. This paper designed a dynamic automatic north-finder based on the modulation output of fiber optic gyroscope (FOG). In this scheme, the sine output signal of the FOG was sampled and disposed, and then the real north of surveyed point on the surface of earth was calculated. The deviation caused by the base tilt was compensated by an accelerator. The output signals of FOG and accelerator were computed combined with the position sampled from increasing encoder by digital signal processor. Successive rotating technique was adopted to modulate the FOG signal periodically. Most of the low frequency part of random gyro drift errors was compensated. The north-finder accuracy was improved compared with the traditional static measuring method. The test result shows the FOG automatic north-finder obtains 2'true north angle accuracies within not more than three minutes, can meet the orientation need of artillery, terrain measurement vehicle, armored car, unmanned drive vehicle, geodetic survey and tunnel exploration.