In order to improve target recognition and accurate positioning, A Non-synchronous processing method base on distributed laser warning signal has been put forward。 First, Work principle and system constitution of distributed laser warning are introduced. The time information of receiving the alarm are exported by pulse form when laser warning device received threat warning signal, then this warning signal are processing and export warning position and other data information by the bus form. The processing center of the warning data receives time information and data information from different sensors. Finally, these not- synchronous warning information carry on fusion with synchronous processing by means of time scale and deviation value. Concrete warning position are obtained through the method and high accuracy recognition probability is achieved, which has higher engineering application value.
In wavefront coding optical system, with the traditional cubic mask plate (CMP) which owns several extension times of depth of focus (DOF), it is difficult to manufacture. With the symmetrical surface type mask plate which can be machine relatively easily, but it presents small multiples of the extension of DOF. In this paper, it makes a presentation of mask plate design by user defined surface(UDS) type where it has an easy mechanical process and several multiples of extension of DOF. It presents the analytic expression by calculation and its DLL data file which is adapted to ZEMAX. It also performs a simulation experiment based on the three mirror Cassegrain(TMC) wavefront system. The experiment results indicate that instead of the traditional mask plate, the UDS surface mask plate can obtain a larger ratio of extension of DOF and increase the valuable types of mask plate surfaces. What is more, it decreases the surface mechanical difficulty compared to the asymmetrical surface mask plate. The type of UDS surface has the unique design and the convenience manufacturing, which is of great value in both application and research.
A novel optical fiber sensor for simultaneous measurement of pressure and surrounding refractive index (RI) based on
long period gratings (LPGs) is proposed and demonstrated. This device consists of two LPGs with different wavelengths,
one of them is shielded from the environment, therefore, is insensitive with surrounding RI. Since the resonant peaks of
these two LPGs change differently, the simultaneous measurement has been done. The experimental results show that the
device has a good performance in measurement.