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

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.

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.