9 results about "Pulsed laser" patented technology

The invention discloses an anti-fake film and a method for making the same. The method comprises the following steps of: depositing a layer of metal film by vacuum roll coating technique on a flexible base material, producing a group of invisible codes which can only be read by machines after the dealing the metal film by a pulsed laser source or a pulsed ion source. The anti-fake film of the invention can play an anti-fake function by both naked eye visualization and machine reading, and can be analyzed by experts finally, with ideal results. Therefore, the anti-fake film can be applied widely to the prevention of fake commodities, ID cards, securities and paper money.

The invention discloses a dual optical path device for connecting a pulse laser with a terminal experiment cavity. The dual optical path device (12) for connecting the pulse laser (11) with the terminal experiment cavity connects the pulse laser (11), a thin film deposition system (13) and a vacuum glove box (14). The pulse laser (11) is of a PRO-320Nd: YAG type. The dual optical path device (12) for connecting the pulse laser (11) with the terminal experiment cavity is composed of seven dielectric film reflectors, a focusing mirror, and corresponding mirror brackets and optical path protection devices. Two optical paths of the dual optical path device (12) for connecting the pulse laser (11) with the terminal experiment cavity are respectively corresponding to lasers 1064nm and 532nm in wavelength, wherein the invisible infrared light 1064nm in wavelength respectively passes through three optional dielectric film reflectors and the focusing mirror, and then reaches a reaction furnace, and the green light 532nm in wavelength can pass through the other four dielectric film reflectors, and then reaches a thin film deposition cavity. The dual optical path device (12) for connecting the pulse laser (11) with the terminal experiment cavity overcomes deficiencies in the prior art, and is simple in structure and low in cost. The dual optical path device (12) for connecting the pulse laser (11) with the terminal experiment cavity can integrate one laser with a plurality of different experiment terminals, and greatly improves experimental research and social production efficiency.

The invention discloses a distance measurement method and distance measurement system, wherein the method includes the following steps: a pulse laser emits a laser signal; a photodiode APD array receives a return signal which is returned after the laser signal encounters a measured target, and transmits the received return signal to a timing chip; the timing chip determines the flight time of a rail train to the measured target according to the laser signal and the return signal, and transmits the determined flight time to a Programmable Logic Controller (PLC), and the timing chip reaches ns-level measurement accuracy; and the PLC determines distance between the rail train and the measured target according to the received flight time. The distance measurement method provided by the invention solves the technical problems of complicated measurement structure and low accuracy brought by adoption of a direct counting mode in related technologies, improves measurement accuracy, and simplifies the structure.

The invention provides a multichannel optical path difference detection device and method based on double-loop detection. The device comprises a pulse laser and a continuous laser which are connectedwith a synthesis branching unit. The synthesis demultiplexer is connected with the multi-channel optical path regulator, the multi-channel gating device, the to-be-tested device, the collimation emitter, the focusing mirror and the laser demultiplexer in sequence. The laser splitter is connected with the laser imager and the image processor to perform continuous loop optical path difference detection based on continuous interference images, and is connected with the laser detector and the pulse signal processor to perform picosecond pulse-based pulse loop optical path difference detection. Thecontroller controls the device and calculates the detection value of the optical path difference between the two to-be-detected channels in the to-be-detected equipment based on the continuous loop optical path data and the pulse loop optical path difference. According to the invention, the formed double loops refer to each other, the measurement result is optimized, the high-precision digital detection of the optical path difference between the unit laser channels in the multi-channel laser equipment is realized, and the detection precision can reach the sub-millimeter magnitude.