49results about How to "Unaffected by noise" patented technology

The invention discloses a control driving system for a medical accelerator frame. The control driving system comprises a main control computer, an RS485 serial communication module, a frequency converter, a motor, a photoelectric encoder, a photoelectric encoder analyzing module, a motor braking module, and an accurate frame rotation control module, wherein the controlling target is the frame; the RS485 serial communication module comprises a first RS485 standard serial port and a second RS485 standard serial port; the main control computer communicates with the accurate frame rotation control module through the first RS485 standard serial port, and is used for sending rotation frame control instructions, and receiving and displaying angle information of the frame; the accurate frame rotation control module comprises a judging unit, a frame zero marking unit, a frequency conversion unit, a braking unit, a main unit injunction response unit and a V / F output unit. The control driving system has the advantages that the reliability is high; the frame rotation control accuracy is high.

The invention refers to a live-detection method of insulator fault in HV transmission line, belonging to power transmission field, the sensitivity high and the use convenient. The technique project; when synthetical insulator has electric fault or ceramic insulator has zero-value insulator, the axial and radical distribution along insulator of the surrounding electric field will produce distortion, detect the distribution and respectively compare with non-fault standard electric field, if no obvious difference, judge normal, otherwise, judge the insulator has fault.

The present invention discloses a terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis, and relates to the field of spectrum analysis and substance type detection technologies. The method comprises: acquiring a time domain observed signal, filtering noise information by a frequency terahertz spectrum curve obtained from a discrete fourier transformation, performing cubic spline interpolation on the spectrum curve, performing resampling by intercepting comparable data in a same frequency range and completing data normalization; and performing a convex combination kernel function mapping on a sample after completing preprocessing, performing dimension reduction on a mapped basis function matrix to finally realize terahertz spectroscopy feature extraction, and analyzing intra-cluster, inter-cluster relationships of dimension reduced data. According to the terahertz spectroscopy feature extraction method based on convex combination kernel function principal component analysis, the number and high resolution of a spectrum sample are not required, and the effect of a interference signal on the feature extraction can be fully reduced, so that the feature extraction and a low dimension representation of the terahertz frequency domain spectroscopy are realized in the case of unknown substance types and numbers, and the method has a distinct cluster effect.

The invention discloses an intelligent environment control system for improving an equipment operation environment. The intelligent environment control system relates to the technical field of environment control systems, and is mainly composed of an acquisition module, a regulation and control system and a monitoring terminal. The intelligent environment control system not only has good heat dissipation and dehumidification effects on a cabinet body, but also provides a good monitoring environment for a monitoring room.

The invention discloses a method and device for image segmentation based on sparse principal component analysis. For each point in the image to be processed, the neighborhood of the point is obtained, and similar image blocks are obtained according to the gray value of the neighborhood to form a sample. In the training set, the sparse principal component analysis is performed on the sample block corresponding to the point in the sample training set, and the sparse principal component expression base and sparse principal component expression coefficient are obtained. According to the sparse principal component expression base and sparse principal component expression coefficient, the The pixel value of the image block centered on the point does not contain noise, and the noise-free image is constructed according to the noise-free pixel value corresponding to each point in the image to be processed, and the two-dimensional histogram is performed on the noise-free image respectively. Global threshold segmentation and local threshold segmentation based on the moving average method. The images obtained by the two segmentation methods are obtained according to the regional connectivity, and the segmented image is obtained to ensure that the segmented image is not affected by noise.

In order to provide an ink level detecting unit of an ink jet recording apparatus, which detects surely residual vibration by resonance with a medium such as ink coming into contact with a vibration element without receiving influences such as noise, thereby to heighten ink detection accuracy and reliability, there are provided a piezoelectric element 12 provided in an ink tank 11, an excitation pulse generating part 13 for applying an excitation pulse to the piezoelectric element 12, a sensor 14 which detects a frequency of a counter electromotive force waveform from the piezoelectric element 12 based on residual vibration by resonance with a medium in the ink tank 11, and a judgment part 15 which judges the existence of ink on the basis of the detected frequency. The sensor 14 has two band pass filters 22A and 22B which cause only waveforms in the predetermined frequency bands that have been previously assumed according to ink presence and ink absence to pass; and a frequency measuring part 150 which binarizes the counter electromotive force waveform, counts the number of pulses of the binarized counter electromotive force waveform, counts time from the predetermined number-th pulse to the predetermined number of pulse, and detects a frequency of the counter electromotive force waveform on the basis of this time. An ink remaining amount measuring device for an ink-jet recorder having high ink measuring accuracy and high reliability by accurately measuring the residual vibration due to resonance between a vibration element and a medium such as ink in contact with the vibration element without being influenced by noise. The ink remaining amount measuring device comprises a piezoelectric element (12) provided in an ink tank (11), an excitation pulse generating section (13) for applying an excitation pulse to the piezoelectric element (12).

The invention relates to the field of E06B3 / 48(2006.01)I, and particularly discloses a sound absorbing door easy to clean. The sound absorbing door comprises a door frame, a door leaf with a cat eye, a door shaft and a foldable sound absorbing plate; the connecting end of the door leaf is rotatably connected with the door frame through the door shaft, the side, facing outdoors, of the door leaf is connected with a sliding rail, the sound absorbing plate is provided with a movable block located at the folding portion of the sound absorbing plate, the sound absorbing plate is provided with an embedding hole of the movable block, and the embedding hole is opposite to the cat eye; the length of the sound absorbing plate is larger than that of the sliding rail, an automatic telescopic part is arranged in the sliding rail, the length of the automatic telescopic part is equal to that of the sound absorbing plate, one end of the automatic telescopic part is connected to the end, facing the door shaft, of the sliding rail, and the upper end of the sound absorbing plate is provided with connecting points which are arranged at a fixed distance and connected to the automatic telescopic part. The sound absorbing door easy to clean is used for solving the problem that an existing hotel door is difficult to clean due to the special shape.

The invention discloses a method for obtaining ultra-stable Stokes frequency shift light and relates to the technical field of nonlinear optics. The method solves the problem of poor stability of the Stokes frequency shift light obtained by the existing method. In the method, the linearly polarized lights injected by a system are divided into a transmitted light beam A and a reflected light beam C at the location of a first polaroid sheet; the head part of the pulse edge of the light beam A penetrates a first medium pool, passes through an attenuation sheet and a quarter wave plate, then is focused to a second medium pool by a lens, and generates a light beam B in the second medium pool; the light beam B reversely returns into the first medium pool along the optical path of the light beamA and generates interference when encountering the light beam C in the first medium pool; the interference thereof forms a beat frequency and generates a stable acoustic wave; the pulse body part of the light beam A is dispersed by the acoustic wave to form a light beam D, namely the frequency shift light. The method is suitable for various systems and occasions which need the ultra-stable Stokesfrequency shift light.

The invention relates to the field of E06B3 / 48(2006.01)I, and particularly discloses a sound absorbing door easy to clean. The sound absorbing door comprises a door frame, a door leaf with a cat eye, a door shaft and a foldable sound absorbing plate; the connecting end of the door leaf is rotatably connected with the door frame through the door shaft, the side, facing outdoors, of the door leaf is connected with a sliding rail, the sound absorbing plate is provided with a movable block located at the folding portion of the sound absorbing plate, the sound absorbing plate is provided with an embedding hole of the movable block, and the embedding hole is opposite to the cat eye; the length of the sound absorbing plate is larger than that of the sliding rail, an automatic telescopic part is arranged in the sliding rail, the length of the automatic telescopic part is equal to that of the sound absorbing plate, one end of the automatic telescopic part is connected to the end, facing the door shaft, of the sliding rail, and the upper end of the sound absorbing plate is provided with connecting points which are arranged at a fixed distance and connected to the automatic telescopic part. The sound absorbing door easy to clean is used for solving the problem that an existing hotel door is difficult to clean due to the special shape.