Abstract:
본 고안은 유압에 의하여 구조물을 가압한 후 가압하던 힘을 신속히 제거하여 구조물이 급속히 복원할 수 있도록 함으로써 구조물의 진동시험시 구조물의 자유진동을 유발할 수 있도록 구성한 구조물의 가진장치에 관한 것이다. 본 고안에서는, 구조물(100)에 압력을 가하고 해제함을 반복하여 구조물(100)을 가진하는 구조물 가진장치로서, 유체공급관(141)을 따라 유체저장부(121)에서 내부로 유입된 유체에 의해 구조물(100)에 압력을 가하는 잭(110)과, 잭(110)에 채워진 유체를 배출하는 제1 유체배출관(142, 143)에 설치되며, 유체공급관(141)에서 연장된 연결관(145)을 따라 유입된 유체에 의해 제1 유체배출관(142, 143)을 개폐하는 제1 밸브(131)와, 연결관(145)에서 분기된 제2 유체배출관(144)을 개폐하는 제2 밸브(133)를 포함하며, 제1 밸브(131)는 제2 밸브(133)의 개방에 따라 제1 유체배출관(142, 143)을 개방하고, 제2 밸브(131)의 폐쇄에 따라 제1 유체배출관(142, 143)을 폐쇄하도록 구성한 것을 특징으로 하는 구조물 가진장치가 제공된다. 이와 같이 구성된 본 고안의 구조물 가진장치는 구조물에 가하던 압력을 해제함에 있어서, 구조물의 복원력에 대한 반력이 발생하지 않도록 압력을 신속하게 해제함으로써, 구조물의 자유진동을 구현할 수 있다. 따라서 구조물의 진동시험 결과에 대한 신뢰성을 향상시킬 수 있다는 장점이 있다.
Abstract:
A method for detecting loose blades in a hand piece connected to an ultrasonic surgical system by performing frequency sweeps of a drive signal through a range which includes the resonance of a hand piece/blade system and the resonance of the hand piece without a blade attached. The frequencies of resonance in each sweep are compared. If a substantial difference between the frequency sweeps occurs, then a "Tighten Blade" message is displayed on a liquid crystal display on an ultrasonic generator console. The method permits rapid and easy diagnosis of loose blade connections. The method also assists a surgeon or nurse in knowing when to tighten the blade, as opposed to performing more lengthy and detailed diagnostic or cleaning procedures. In addition, the time and costs associated with the diagnostic procedures to isolate faults are eliminated because, upon determining that the blade is not loose, the surgeon and/or nurse can request a new blade based on the assumption that the blade is broken.
Abstract:
The invention relates to a method for determining a working range of an ultrasonic vibrating unit (7), which ultrasonic vibrating unit (7) is supplied with electrical power by a generator (2) via an output (2a) and is excited to vibrate ultrasonically, wherein at least constituent parts of the ultrasonic vibrating unit (7), preferably an ultrasonic converter (8) contained therein, and constituent parts of the generator (2), preferably a matching network (2b) on the output side, form a tuned circuit (2c, 2d). Said method is characterized in that a measuring circuit (3) is connected upstream of the output (2a) of the generator (2), via the measuring circuit (3), a voltage (U) is applied to the tuned circuit, by means of the measuring circuit (3), at least the phase, preferably magnitude and phase, of an impedance of the tuned circuit are measured, and at least the phase, preferably the phase and magnitude, of the impedance are evaluated in order to determine the working range. The invention further relates to a circuit arrangement for carrying out the aforementioned method.
Abstract:
A method for operating an ultrasound device (1) is proposed, which ultrasound device (1) comprises at least one ultrasound oscillator (3) and at least one ultrasound generator (2), which ultrasound oscillator (3) is prompted to oscillate by the ultrasound generator (2), which method is distinguished in that during operation of the ultrasound device (1) a temperature (T) of the ultrasound oscillator (3) is ascertained, and in that the ascertained temperature (T) is taken as a basis for modifying a power delivered by the ultrasound generator (2) to the ultrasound oscillator (3), to which end an actual variable (IL, ILS) and/or a setpoint variable (SL) for a control loop of the ultrasound generator (2) is/are altered in said control loop. In addition, a regulatory circuit (6) for an ultrasound device (1) and also an ultrasound device (1) are proposed which are suitable for carrying out the method.
Abstract:
Systems and methods for testing the performance of a focused ultrasound transducer array include transmitting ultrasonic energy from the transducer array (12) towards an acoustic reflector (18), such as a planar air mirror (18), and receiving ultrasonic energy reflected off of the acoustic reflector using a sensing element (20). A characteristic of the reflected ultrasonic energy, such as amplitude and phase, is measured by processing circuitry, for example, by comparing the characteristic of the received ultrasonic energy to a corresponding characteristic of the transmitted ultrasonic energy to obtain an actual gain and phase shift for the received ultrasonic energy. A controller compares the actual gain and phase shift of the received ultrasonic energy to an expected gain and phase shift of the received ultrasonic energy. This information is used to calibrate the transducer array and/or to declare a system failure if the comparison indicates an error.
Abstract:
The present invention pertains to a method of capacitive stimulation of an oscillator control in sensors used for capacitive measurement of strengh, acceleration and especially rotation speed based on the Coriolis principle. In this method, the control is stimulated using high frequency pulse packs, free of continuous voltage and constant in amplitude, of which the width or phase angle relative to the stabilized oscillation speed is adjusted for the purpose of resetting to the initial state or correcting tolerances. Another embodiment of the inventive method allows, in case of electrode oscillators installed in pairs and symmetrically relative to the rotation axis, for high frequency voltages to be obtained that are identical and constant in amplitude. The frequency chosen for these voltages is clearly above the oscillator frequency, resulting in a certain attractive force acting upon the oscillator by shifting the mutual phase lag in the control voltages. In the case of rotation speed sensors the setting of which is based on the closed-loop principle, a resetting to the initial state may also be ensured. The invention also enables problems related to coupling the stimulating signal in the selector channel of a micromechanical oscillator system to be overcome.