Luminescence anticounterfeiting is
one of the most significant
technologies to protect information security. However, the luminescence
of the present anticounterfeiting logo is static, which is easily
counterfeited by substitutes, and it always requires an ultraviolet
lamp in use, which is inconvenient in application. In this work, according
to the present deficiencies of luminescence anticounterfeiting, an
interesting phosphor CaZnGe2O6/Mn2+ with unique features of dynamic photoluminescence and non-pre-irradiation
mechanoluminescence is developed for the first time. The photoluminescence
color of the phosphor can dynamically change from green to red during
irradiation, and the non-pre-irradiation mechanoluminescence of the
phosphor-based elastomer can be easily stimulated by mechanics such
as stretching, bending, or scratching with a finger. By combining
the two features of the CaZnGe2O6/Mn2+ phosphor, an advanced dual-mode luminescence anticounterfeiting
is designed, and a luminescence logo is fabricated for the anticounterfeiting
test. The result demonstrates that this advanced luminescence anticounterfeiting
based on the phosphor is not only safer but also more convenient in
application.
An interesting dynamic irradiation-responsive material CaZnGe2O6 : Pb2+ is developed, which shows unique dynamic photoluminescence/photochromism properties under irradiation and advanced anti-counterfeiting applications in dark and bright fields.
This article presents a novel method to simultaneously measure the six-degree-of-freedom (6-DOF) absolute position and attitude based on light spots. The proposed system consists of a measurement unit and a moving target: the measurement unit contains a laser, three cube corner retroreflectors (CCR), three CMOSs, and some beam splitters; the target is a cube with three CCRs installed on each of its three orthogonal planes. In the measurement unit, the laser is split into three reference lights as well as three measured lights which are detected by three CMOSs after returning from six CCRs. Based on the vector analysis of the optical path, the relationship between 6-DOF position and attitude of the moving target and the output coordinates of three CMOSs is established. This method is capable of simultaneously measuring translational motions along as well as rotational motions around three orthogonal axes and achieving the absolute positioning of the target, which has overcome the shortage that the measurement systems based on laser interference can not measure absolute position and attitude. The accuracy of this method has been verified by Monte Carlo stochastic simulation and sinusoidal trajectory simulation in the range of the target's motion. The simulation results show that the errors of position are less than 0.5 μm and the errors of attitude are less than 2.3 ″, which indicates the algorithm error is no more than the minimum pixel size of CMOS. This 6-DOF absolute pose simultaneous measurement method with simplicity and high precision has great potential for application in various precision machining fields.
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