68results about How to "Expand the capture range" patented technology

An imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with negative refractive power has a convex object-side surface and a concave image-side surface. The second lens element has positive refractive power. The third lens element has refractive power. The fourth lens element with refractive power has an object-side surface and an image-side surface being aspheric. The fifth lens element with positive refractive power has an object-side surface and an image-side surface being aspheric. The sixth lens element with negative refractive power has a concave image-side surface, wherein at least one reflection point is formed on the image-side surface thereof.

A filter circuit arrangement for filtering of a radio-frequency signal has a first tunable filter and a phase regulation loop in order to hold the first tunable filter to a transmission phase constant relative to the frequency of the radio-frequency signal. The filter circuit arrangement has a second tunable filter arranged parallel to the first tunable filter in the phase regulation loop. The first tunable filter and the second tunable filter exhibit different attenuation characteristics and are fashioned and connected within the phase regulation loop so that: a capture range of the filter circuit arrangement, in which a tuning of the phase regulation loop to a radio-frequency signal to be filtered is possible is dominated by the attenuation characteristic of the second tunable filter, and so that the transmission behavior of the filter circuit arrangement in operation is dominated by the attenuation characteristic of the first tunable filter, given a tuned phase regulation loop. A circuit arrangement for generation of a local oscillator signal has an oscillation generator and a filter circuit arrangement as described above arranged downstream of the oscillation generator.

The invention relates to an operation instrument for optical tweezers. The operation instrument comprises a laser source, a convex lens, a plane mirror, a two-tone spectroscope, optical wedges, a focusing objective lens, a sample table, a sample pool, an illuminating light source and a CCD camera. Light beams are emitted by the laser source, expanded and shaped by a light beam coupler, and then are converged and irradiated by the plane first mirror, the two-tone spectroscope, the two deflection optical wedges and the focusing objective lens into the sample pool to capture target particles, the first optical wedge and the second optical wedge are driven by a motor to deflect around the Y axis and the X axis respectively in an orthogonal mode, the deflection angle can be measured through an angle sensor, the deflection of the light beams is controlled, and the target particles are moved; the particle capturing and moving process can be visually acquired through the CCD camera and a displayer. When the particles move in the plane parallel to the XOY plane, the sample pool does not need to move, namely, the particles are not affected by external vibration in the moving process; in addition, due to the fact that the two orthogonal deflection optical wedges can achieve the light beam deflection hundredfold-order reduction ratio, the deflection directions of the light beams can be accurately controlled, and the light beams can capture the particles accurately and carry the particles to move firmly.

The invention discloses a high-precision frequency and phase discrimination signal processing method and device in laser offset frequency locking. The method comprises the steps: enabling tunable laser and a femtosecond optical frequency comb to pass through a beat frequency signal detection unit to obtain a beat frequency signal, performing analog-digital sampling on the beat frequency signal andthen enabling the signal to enter an FPGA development board for frequency and phase discrimination processing; multiplying the beat frequency signal by a reference signal and carrying out low-pass filtering; acquiring a corresponding phase through a coordinate rotation arithmetic unit; performing scaling processing on a phase after phase unwrapping, outputting an error voltage signal to an analogPID controller through a digital-to-analog converter, enabling the analog PID controller to generate a control signal to the tunable laser for closed-loop control, locking the frequency of a beat frequency signal to a reference signal, and calculating the signal-to-noise ratio, the frequency and the amplitude of the beat frequency signal. The invention solves the problems of difficulty in improving the frequency and phase discrimination precision of the beat frequency signal and small capture range in the offset frequency locking technology of locking the laser to the optical frequency comb,and can be widely applied to the field of laser precision measurement.

The invention provides a method for capturing water armies on microblog platforms. The method includes the following steps: step one, by forwarding lists of new microblog hot topics or celebrity microblogs, and with the help of artificial judging, acquiring an initial water army sample S; step two, acquiring fan lists L of all the sampled water armies, and according to preset threshold values, filtering and obtaining user lists L' in close relations with a plurality of water armies in the sample; step three, acquiring the feature information of microblog publishing of the users; step four, judging the users whether to have the characteristics of the water armies or not one by one with the information acquired in the step three; and step five, adding the newly obtained water armies to the sample and then selecting an iterative process repeating the step two to the step four.

The invention relates to a method for segmenting a cardiac nuclear magnetic resonance image. The method for segmenting the cardiac nuclear magnetic resonance image comprises the following steps of: 1, performing Gaussian filtering preprocessing on the acquired cardiac nuclear magnetic resonance image; 2, computing an external force field of a generalized gradient vector flow based on expansion neighborhood and noise smoothing on the preprocessed image; 3, defining an initialized outline position of the left ventricular endocardium of the heart; 4, segmenting the left ventricular endocardium of the heart; 5, defining a final segmenting outline result of the left ventricular endocardium of the heart into an initialized outline position of the left ventricular epicardium of the heart; 6, setting the boundary strength of an area surrounded by the endocardium outline in an original boundary graph to be 0, recomputing the external force field of the generalized gradient vector flow based onthe expansion neighborhood and the noise smoothing; and 7, segmenting the left ventricular epicardium of the heart. Based on convolution computation, and by taking energy constraint of an elliptical shape, the method for segmenting the cardiac nuclear magnetic resonance image has the advantages of high computing speed, wide capturing range, strong anti-noise ability, excellent performance in weakboundary protection and deep dented region segmentation, and capability of accurately segmenting the left ventricular endocardium and the left ventricular epicardium of the heart.

A PLL clock generator generates an output signal with a frequency N times (where N>=1) as high as that of an input signal. The clock generator includes: a frequency divider for dividing the frequency of a clock signal by N so as to output a frequency-divided clock signal; a phase comparator for detecting a phase difference between the input signal and the output signal of the frequency divider so as to output a phase difference signal including information representing the phase difference; a LPF for smoothing the phase difference signal; a VCO for generating the clock signal, of which the frequency is determined by the output of the LPF, and outputting the clock signal to the frequency divider; and a phase shifter for shifting the phase of the output signal of the frequency divider in accordance with the phase difference signal.

The present invention improves a lead-in time of the PLL with a phase error detector having an enlarged range of phase error detection and gain control based on the PLL synchronous state. The phase error detection range is enlarged by correcting the phase error detection point in a case where the phase error increases. A locked state of the PLL is determined based on a standard deviation of the smoothed phase error values and the gains are switched between a lead-in transient state and a stationary state. As a result, it is possible to shorten and stabilize the lead-in time of the PLL.

The invention relates to a cardiac nuclear magnetic resonance image segmentation method which comprises the following steps of: 1, carrying out Gaussian filtering pretreatment on an image; 2, calculating an external force field of an edge for keeping a normal gradient vector flow; 3, defining an initialization outline position of an inner membrane of the cardiac ventriculus sinister; 4, adding a circular energy constraint in a curve evolution process, and segmenting to obtain the inner membrane; 5, defining a final segmentation outline result of the inner membrane as an initialization outlineposition of an outer membrane; 6, setting the edge strength of a zone enclosed by the inner membrane outline in an original edge graph as 0, and re-calculating the external force field; and 7, addinga circular energy constraint in a curve evolution process, and segmenting to obtain the outer membrane. The invention has the advantages of large capturing range, strong noise proof capacity, better robustness to weak edge leakage, and capability of accurately segmenting the inner membrane and the outer membrane of the ventriculus sinister wall.

The invention provides a multiple-variable-propeller wind driven electric generator. The multiple-variable-propeller wind driven electric generator comprises variable propeller devices used for capturing and converting gravitational potential energy of wind energy/rain water into own rotational potential energy and further used for capturing and using solar energy, a power source used for providing driving power for deformation of the variable propeller devices, an anemoscope used for detecting the power generation environment natural wind flowing direction and delivering wind direction signals to a controller, a power generation cabin used for accepting the rotational potential energy of the variable propeller devices and converting the rotational potential energy into electric energy anda tower rack used for erecting and supporting the power generation cabin, wherein the variable propeller devices are arranged at the front end of the power generation cabin, the anemoscope is arranged at the rear end of the power generation cabin, the tower rack is arranged between the power generation cabin and the ground and the power generation cabin is rotatably arranged at the top of the tower rack, the tower rack is internally provided with a yawing device for driving the power generation cabin to rotate around the vertical direction, and signal connection is established between the yawing device and the controller.

A microscope for high-resolution imaging of a sample in a depth direction and transversely thereto has an excitation beam path for illuminating a sample,—an imaging beam path with an objective and two detectors,—and a phase element. The phase element is situated in a pupil of the imaging beam path and has a different influence on two halves of the pupil cross section. The imaging beam path is split into two partial imaging beam paths downstream of the pupil as seen in the imaging direction, which partial imaging beam paths each lead to one of the two detectors. The two partial imaging beam paths have imaging lengths that differ by a specific wavelength difference such that the two detectors record images of the sample from two different focal planes, which are spaced apart by a distance in the depth direction.

The invention provides a multi-pitch-varying power generating method of a wind driven generator. The method includes the steps that in a wind blowing environment, a controller transmits wind directionsignals of an anemoscope to a yaw device, the yaw device drives a power generating bin to rotate, a pitch varying device conforms to wind directions, the pitch varying device captures wind energy andconverts the wind energy into rotation potential energy of itself, and the pitch varying device drives the power generating bin to operate to generate power; in a rainfall breezeless environment, thepitch varying device is automatically transformed into a V structure with an upward opening and captures the gravitational potential energy of rainwater, the gravitational potential energy of the rainwater is converted into the rotation potential energy of the pitch varying device, and the pitch varying device drives the power generating bin to operate to generate power; in a sunny breezeless environment, the pitch varying device is automatically transformed and folded, solar energy is captured, and power is directly generated; and in a hurricane environment, the pitch varying device is automatically transformed to be parallel to the wind directions, impact force of hurricane to the pitch varying device is reduced, and the pitch varying device is in a self-protection state.

The invention relates to an auxiliary phase discrimination circuit of a PN code loop. The auxiliary phase discrimination circuit of the PN code loop can expand the range of phase discrimination of the PN code loop and the range of capture of phase positions of the PN code loop, and can improve the tolerance capacity of the PN code loop to initial phase position errors. According to the technical scheme, a PN code loop phase discrimination circuit and an extended PN code loop phase discrimination circuit are used, wherein the PN code loop phase discrimination circuit is formed by two paths, and each path is formed in the mode that a correlator circuit, an accumulated point zeroing filter circuit and an absolute-value evaluation circuit are connected in series in sequence, and the common end of the two paths is connected with a subtracter; the extended PN code loop phase discrimination circuit is formed by two paths, and each path is formed in the mode that a correlator circuit, an accumulated point zeroing filter circuit and an absolute-value evaluation circuit are connected in series in sequence, and the common end of the two paths is connected with a subtracter; the correlator circuits of the PN code loop phase discrimination circuit and the correlator circuits of the extended PN code loop phase discrimination circuit are respectively connected with code sequence output of a PN code generator, and the subtracter of the PN code loop phase discrimination circuit and the subtracter of the extended PN code loop phase discrimination circuit are together connected with an added circuit used for solving error voltage. Error voltage output is obtained by the PN code loop phase discrimination circuit and the extended PN code loop phase discrimination circuit through the added circuit. Compared with the prior art, the capture range of the auxiliary phase discrimination circuit of the PN code loop is three times that of an initial phase position, and a related secondary peak, located within the range from a positive half chip to a negative half chip, of an existing phase discrimination circuit can be eliminated.

The present invention discloses a method and image pick-up system for obtaining clear images through the rain, snow or fog. The method includes a DSP processing module controls a laser pulse generating module output laser pulse signals with a default pulse width, and shut the laser pulse generating module down when a first default time arrives; when the laser pulse signals is being output, the DSP processing module controls an electronic shutter of an image pick-up device open after delaying for a second default time, and close the electronic shutter when a third default time arrives; wherein, the third default time is a lasting period of the default pulse width of the laser pulse signals; then, an FPGA module processes the images captured by the image pick-up device, and outputs clearer images, or makes the capturing distance farther but obtains clear images.