31 results about "Slope error" patented technology

A power converter includes an isolated or a nonisolated current-doubler rectification circuit including two magnetic circuit elements, each magnetic circuit element formed with a primary winding and a voltage-sensing winding. The primary windings are coupled in series. The voltage-sensing windings are also coupled in series but with a coupling sense opposite from that of the primary windings. A properly sized inductor and capacitor are coupled in series with the voltage-sensing windings to produce a ripple-cancellation current with slope opposite to a net slope error of currents produced in the two magnetic circuit elements. The current-doubler rectification circuit is preferably coupled to a rectangular ac input waveform. By sensing a scaled voltage difference between two magnetic circuit elements, a very low level of output ripple is produced by the circuit with very low power losses over a range of operating conditions.

The disclosure relates to a glass window for optical systems, in particular for LiDAR systems, in which the glass window has a curved form. For length scales between 0.1 mm and 15 mm, at least 50% ofthe area of the glass window has a geometrical slope error SEG for which the following is true: SEG<-2.3*10<-6>*2*R0[1 / mm]+7.3*10<-4>.

The present invention provides strategies for mitigating the deleterious effects of differential thermal expansion in composite panel structures. The principles of the present invention are particularly useful in the field of concentrating solar power. The principles of the present invention can be used in CSP applications to make composite mirror panel structures with improved characteristics for accommodating differential thermal expansion between components of the composite. Significantly, the composite mirrors structures can still be securely attached to other heliostat components such as a drive mechanism while still having the ability to accommodate differential thermal expansion between the skins of a composite mirror panel helps to limit energy losses due to slope errors.

The invention relates to a liquid crystal phased array wave control data determination method based on wave surface iteration, which belongs to the technical field of laser phased array radar and relates to liquid crystal phased array wave beam control. The method mainly comprises the following steps of: (1) calculating an emergency stage wave surface by using a traditional wave control method according to a deflexion angle required to be obtained; (2) calculating an average slope of the stage wave surface and an ideal linear wave surface to obtain an average slope error; (3) recording a stepedge position included in the stage wave surface and calculating the change of the average slope of each step edge after translation; and (4) judging whether the change of the average slope after thetranslation of the step reduces the average slope error or not; and if so, judging whether the step edges are moved leftwards or rightwards and carrying out iteration; and if not, stopping the iteration. By utilizing the relation of the average slope of the emergency stage wave surface of the liquid crystal phased array and the angle error, the invention obtains high-precision wave control data through the translation of the step edges, and can realize wave beam scanning with higher precision and more angles in comparison with the traditional wave control method.

The invention discloses a method for acquiring gravity associated bending combined with minimum image disk of a synchrotron radiation trapezoid vertical focus lens. The method comprises the following steps of: establishing a gravity-containing differential equation with which the bending reflection accords according to the beam bending theory of material mechanics; establishing an image disk widening function caused by the lens shape error of the focus lens; calculating a design parameter which makes the image disk widening function acquire the minimum value; and determining the parameters of the focus lens according to the above calculation result and bending the focus lens. By the method, the gravity surface shape error is eliminated, surface shape slope error and image disk widening are greatly reduced, and the surface shape slope error and the image disk widening of the method of gravity associated bending combined with the minimum image disk are greatly reduced on the basis of the gravity associated bending method.

The invention relates to a Wolter‑I type X-ray optical reflective lens performance evaluation method, which belongs to the field of space optics technology; Step 1, select the optical reflective lens; Step 2, divide the slope error measurement grid and roundness on the outer wall of the optical reflective lens Error measurement grid; step 3, measure the slope error h k,i , roundness error and actual radius r j ; Step 4, calculate the conversion slope error data h' k,i ; And reconstruct the fitting mirror surface according to the conversion slope error data; Step 5, set up an incident ray from the parabolic primary mirror into the optical reflector; Step 6, determine the normal vector of the first reflection point a, a point and the first reflection Step 7, determine the second reflection point b, the normal vector and the exit direction after the second reflection; Step 8, judge the performance of the optical mirror according to the distribution range of all focus points; the present invention will accuracy High, small amount of calculation, high efficiency.

The present invention provides an improvement to existing canting, slope error, and / or pointing measurement approaches, by using one or more cameras to observe the reflections of points of light in the firmament, such as the reflections of stars and / or planets as visible within the night sky in the heliostat facets. An illustrative heliostat measurement system comprises a plurality of heliostats,and at least one camera that observes at least one heliostat. The heliostats reflect an image of the firmament that can be observed by the at least one camera. The system further comprises (i) at least one captured image of the firmament reflected from at least one of the heliostats; and (ii) a computer comprising programming that determines a heliostat imperfection from the captured image, wherein the heliostat imperfection is selected from at least one of a slope error, a canting error, and a pointing error.

The invention discloses an optical-fiber strap-down inertial measurement unit reciprocating-type two-position north finding method for inhibiting slope error influence of devices, which is characterized in that: a reciprocating-type two-position alignment process is adequately utilized, on the basis of a traditional best two-position alignment and under the situation that hardware cost is not increased, constant errors of the devices can be effectively eliminated through reasonable design of rotation time intervals, rotation ways, the design parameters of a filter, and the like, influence of slope errors of the devices can also be inhibited, and the north finding precision of an optical-fiber inertial measurement unit can be improved.

The present invention provides a method for calculating the recovery voltage of a composite wavefront sensing adaptive optical system. When a high-order wavefront sensor and a wavefront corrector are selected to form a high-order adaptive optical system, the direct slope wavefront restoration matrix R0 is used to multiply the high-order wavefront The wavefront slope s0 measured by the front sensor is used to obtain the restored voltage v; when a low-order wavefront sensor and a wavefront corrector are selected to form a low-order adaptive optics system, the calculation of the restored voltage v has the following steps: (1) Using the low-order self-adaptive optics system The mode reconstruction matrix W1 of the adaptive optics system is multiplied by the wavefront slope error s1 measured by the low-order wavefront sensor to obtain the wavefront error coefficient a1; (2) the mode response matrix M0 of the high-order adaptive optics system is multiplied by a1 to obtain The corresponding wavefront slope s2 of the high-order wavefront sensor under the aberration of the mode coefficient a1; (3) The restored voltage v is obtained by multiplying the wavefront slope s2 by the direct slope wavefront restoration matrix R0. The invention can effectively prevent the wavefront corrector from producing high-order aberrations that cannot be detected by low-order wavefront sensors, and improve the stability and closed-loop accuracy of the system.