40results about How to "Self-starting" patented technology

The invention discloses a pulse all polarization-maintaining optical fiber laser based on multiple non-linear amplification loop mirrors. The pulse all polarization-maintaining optical fiber laser comprises a main oscillating cavity, a non-linear amplification loop mirror in preceding stage and one or more non-linear amplification loop mirrors in backward stage, an optical field in the laser is clockwise spread and sequentially passes through the main oscillating cavity, the non-linear amplification loop mirror in preceding stage, one or more non-linear amplification loop mirrors in backward stage and the main oscillating cavity to form a closed-loop cavity; and the low beam-splitting end of a beam splitter in the main oscillating cavity is used as the output end of the laser. The main oscillating cavity provides main gain, stabilizes pulse and controls the direction of an optical path; the non-linear amplification loop mirrors in preceding stage and backward stage are used for realizing self-starting of the locked mode; multiple loop mirrors can effectively inhibit amplitude noise, stabilize mode locking and weaken the pulse splitting, are easy for mode locking, and can reduce the mode locking threshold value, eliminate minor pulses in front of and behind the pulses and narrow the pulse; and the optical fiber model, the length and the pumping light power of each loop mirror are regulated to realize the polarization-maintaining laser output with different parameters such as repetition frequency, pulse width, power and the like.

The invention discloses a pulse separation laser oscillator. The left end of the optical path adopts a double-pass amplification structure combining an erbium-ytterbium co-doped optical fiber and a Faraday rotating mirror, and the right end adopts a SESAM optical path with a full polarization-maintaining structure, which offsets the effects of optical fiber transmission and amplification. Due to the birefringence effect, the space optical path in the oscillator adopts a fully solidified structure to ensure the stability and efficiency of light transmission. It effectively realizes the amplification of pulsed light and meets the requirements of high-power lasers for its seed light. By changing the length of its resonant cavity, it can also generate seed light with various repetition frequencies. In laser construction, repetition frequency locking has many great advantages. Value.

The invention discloses a monitoring security device with anti-mirror fogging effect, the structure of which comprises a mounting buckle plate, a protective cover, an anti-mirror fogging device and a camera. Beneficial effects: the present invention utilizes the mutual cooperation of the provided ventilation ring and the ventilation holes to automatically blow off the invading mosquitoes and dust around the camera at all times, so as to ensure that the field of view of the camera is kept clear at all times, thereby To avoid that the camera monitoring is not in place due to external factors, the present invention utilizes the mutual cooperation of the self-induction structure and the protection mechanism to realize that the monitoring equipment can be self-activated under the action of external natural factors (wind, rain), and make the surrounding The support plate on the upper part of the camera is unfolded, and its fan-shaped structure can be used to prevent the camera from being eroded by rain or wind.

The invention discloses an active and passive hybrid mode-locked optical fiber laser with a temperature compensation function, and belongs to the technical field of optical communication devices. The main structure comprises an active mode-locked optical fiber layer resonant cavity, a temperature compensation system, a passive mode-locked optical fiber laser system and a pulse optimizing system, wherein the active mode-locked optical fiber layer resonant cavity is formed by a pumping light source (1), a wavelength-division multiplexer (2), a first optical coupler (3), an adjustable optical fiber filter (4); the temperature compensation system is formed by absolute ethyl alcohol filled photonic crystal fiber (27), a third optical probe (28) and a second amplifying circuit (29); the passive mode-locked optical fiber laser system is formed by dispersion compensation optical fiber (22) and a black phosphorus saturable absorber (21); the pulse optimizing system is formed by two feedback control rings. Active and passive hybrid mode locking is adopted, a feedback technology is used for conducting automatic feedback control over active and passive hybrid mode-locked optical fiber laser systems, the optical fiber laser has the temperature compensation function, and optical pulses in the system can be optimized better and stable.

The invention discloses a satellite on-orbit orbit predication method based on GPS measurement data. A satellite parsing ephemeris parameter model is mainly given with regard to a low-orbit near-circular satellite orbit, on-orbit predication is carried out on the ephemeris model parameters by virtue of GPS measurement information, and satellite ephemeredes with random time interval can be predicated. A simulation result indicates that the predication accuracy can achieve less than 20km with regard to near-circular orbits with distances of more than 450km; the satellite on-orbit orbit predication method based on GPS measurement data has great practicability.

The embodiment of the present application discloses a self-energy leakage monitoring method based on leakage current, including: step 1: selection of electrodes; step 2: arrangement of electrodes; step 3: calculation of the voltage collected by the two electrodes of the electric energy collection device u 12 ; Step 4: Calculate the energy P extracted by the self-energy leakage monitoring system; the method is applied to a self-energy leakage monitoring system based on leakage current, and the system includes: an electric energy collection device 1, an isolation transformer 2, a rectification filter Device 3 and monitoring device 4; the power collection device includes electrode I5 and electrode II6 to collect leakage current signals of power equipment or transmission lines, the power collection device is connected in series with the primary side of the isolation transformer, and the power collection device collects After the alternating current is processed by the isolation transformer and the rectification and filtering device, it provides a stable driving power for the monitoring device.

The present invention relates to a self-starting application control technology of an intelligent device. Specifically, the present invention discloses a self-starting control method, which includes the following steps: obtaining its broadcast component from the configuration file of an installed application; monitoring the event when the application is running Behavior to determine whether it runs a component calling instruction; when the application does not run a component calling instruction, its broadcast component is set to an unavailable state; when the application runs the component calling instruction, its broadcast component is set to an available state . Correspondingly, the present invention also discloses a self-starting control device for executing the method. The present invention can deeply prohibit the booting self-starting function of the target application, can accelerate the booting speed of the mobile terminal, save the power and flow of the mobile phone, and ensure the normal use of the target application.