31results about How to "Flat response" patented technology

A phacoemulsification system includes a phacoemulsification handpiece including a cutting tip ultrasonically vibrated by an ultrasonic transducer. A power supply is provided for driving the ultrasonic transducer at a resonant frequency of the transducer and cutting tip and varying power to the transducer, in response to loading of the cutting tip, by phase shifting drive signals to the resonant converter which supplies power to the transducer.

A connector is provided for simultaneously improving both the NEXT high frequency performance when low crosstalk plugs are used and the NEXT low frequency performance when high crosstalk plugs are used. The connector includes a first compensation structure provided on an inner metalized layer of the PCB at a first stage area of the PCB, and a second compensation structure, provided at a second stage area of the PCB, for increasing compensation capacitance with increasing frequency.

A flat spatial response LIDAR apparatus for detecting particles within a short range is provided. The apparatus includes a light source projecting a light beam which is back-scattered by the particles to be detected. The back-scattered light is received, detected and analyzed. A spatial filter spatially filters the received back-scattered light in order to flatten the spatial response of the apparatus, so that a same concentration of particles at any distance within the short range will generate a signal of substantially the same intensity. This is for example accomplished by a properly profiled mask disposed in front of the detector, or a plurality of spatially distributed waveguides. As a result, the LIDAR apparatus can compensate for the 1/r² dependence, or other dependences of the back-scattered light on the distance r.

A portable device for detecting a predefined radio frequency transmission of electromagnetic radiation includes a housing; a controller situated within the housing; memory communicatively connected to the controller; an antenna connected to the controller and configured to receive the radio frequency transmission; and an audio-generating component connected to the controller. The controller is operative for sensing magnitude, duration, and/or repetition of the radio frequency transmission; identifying a class of the radio frequency transmission based on one of the magnitude, duration, and repetition associated with the radio frequency transmission; and causing the audio-generating component to output tones to provide aural discrimination of the class of the radio frequency transmission received by the portable device. A directional-sensing wideband frequency detection device is configured to obtain a net bearing of an emission source of an electromagnetic radiation transmission. A device generates a wideband frequency signal having a directed electric field polarization.

An accelerometer or a seismometer using an in-plane suspension geometry having a suspension plate and at least one fixed capacitive plate. The suspension plate is formed from a single piece and includes an external frame, a pair of flexural elements, and an integrated proof mass between the flexures. The flexural elements allow the proof mass to move in the sensitive direction in the plane of suspension while restricting movement in all off-axis directions. Off-axis motion of the proof mass is minimized by the use of intermediate frames disbursed within and between the flexural elements. Intermediate frames can include motion stops to prevent further relative motion during overload conditions. The device can also include a dampening structure, such as a spring or gas structure that includes a trapezoidal piston and corresponding cylinder, to provide damping during non-powered states.

The invention discloses an etched diffraction grating (EDG) device with uniform channel loss and flat passband response. Based on a traditional EDG design, each tooth surface of a grating reflection tooth surface is connected by a plurality of discrete spots to from a curved surface; the spectral response passband of a device is correspondingly divided into a plurality of discrete spots; each discrete spot on each grating reflection tooth surface meets an interference strengthening condition for a corresponding wavelength in the pectral response passband, so as to realize flat passband response; meanwhile the reflection direction of a grating reflection surface deviates from a routine blazed grating reflection direction, allowing light energy to scatter nearby an output waveguide array after transmission of a plate zone so as to realize uniform channel loss. Under the condition of not changing EDG components and not introducing extra devices, the EDG device increases the bandwidth of each channel, and meanwhile improves EDG loss uniformity; the EDG device is suitable for waveguide structures of various materials based on indium phosphide, silicon dioxide, silicon, etc., and has the advantages of simple manufacture, low cost, etc.

The invention relates to a gas scintillation based fission neutron detector. The detector comprises a detector barrel, an entrance window hermetically arranged at the front end face of the detector barrel, an exit window hermetically arranged at the rear end face of the detector barrel, two quartz windows arranged at two lateral surfaces of the detector barrel, at least two target stands fixed in the detector barrel, fission targets suspended on the corresponding target stands, two photoelectric detectors arranged outside the two quartz windows respectively, a charging tool communicated with the detector barrel, and scintillation gas filled in a barrel core; and the scintillation gas adopts inert gas or nitrogen. The gas scintillation based fission neutron detector solves the technical problems of low neutron/gamma resolving power and low neutron sensitivity in the conventional neutron detector, and has the advantages of smooth fast neutron energy response and quick time response.

The invention discloses a microwave source phase noise measuring device based on a bidirectional optical phase modulator, which comprises a microwave power divider, a laser, an optical circulator, a first branch, a second branch, an optical coupler, a photoelectric detector and a signal analysis device. A bidirectional optical phase modulator, a first fiber bragg grating and a single-mode fiber are sequentially arranged in the first branch, a second fiber bragg grating and an adjustable optical delay line are sequentially arranged in the second branch, the optical circulator is provided with three ports, and the three ports are respectively connected with the laser, the bidirectional optical phase modulator and the second fiber bragg grating. According to the invention, the single bidirectional optical phase modulator is utilized to realize a full-optical-domain frequency mixing function, so that the use of an electric frequency mixer is avoided, and the use of active devices such as a microwave amplifier is reduced. The device has the advantages of simple structure, low cost, large working bandwidth and flat response, the noise floor of the phase noise measuring system is reduced, and the measuring precision and sensitivity are improved.

A thin film interleaver device is disclosed. The thin film interleaver includes thin film optics. The thin film(s) are formed such that they reflect one group of wavelengths while allowing a second group of wavelengths to pass through the thin film(s). The thin film(s) exhibit a flat top frequency response across the channel bandwidths of the multiplexed signal for which the thin film filter is designed such that the thin film interleaver is less sensitive to wavelength drift and temperature variations.

A high current RF choke network comprising a high current RF choke combined with an all-pass T-bridge filter. The high current RF choke may be connected to a grounded capacitor in the serial branch of the all-pass filter. In this case the parasitic capacitance of the RF choke practically becomes an integral part of the all-pass filter capacitor. The added capacitance in parallel to the parasitic capacitance of the high current RF choke practically neutralizes the resonances of the high current RF choke and thus extends significantly the operating frequency range of the network. The operating frequencies bandwidth range of the high current RF choke network is extended from the legacy range of 5 MHz to 1 GHz up to an extended range of at least 5 MHz to 3 GHz.

The invention relates to a tactile sensor for an interventional catheter. The whole tactile sensor is of a rod-shaped structure, the front end of the rod-shaped structure is hemispherical, the rod-shaped structure is an intervention catheter 1, and two sections of polyamide films PA3, copper foil 4 and silver-plated PVDF piezoelectric films 5 are attached to the outer surface of the intervention catheter 1 in the horizontal axial direction through the hemispherical shape; a thin and long copper foil 4 is adopted as an electrode for collecting signals to be attached to the surface of a silver-plated PVDF piezoelectric film 5, and a signal line 2 is led out from the welding position of the electrodes on the upper side and the lower side of the silver-plated PVDF piezoelectric film 5; according to the touch sensor for measuring the contact force of the front end and the side wall of the minimally invasive surgery interventional catheter, the PVDF piezoelectric film serves as a piezoelectric sensitive material, sensitivity is high, piezoelectric capacity is high, the structure is simple, and the touch sensor can be applied to the minimally invasive surgery interventional catheter.

The invention discloses a non-reflection filter with equal ripple response, which comprises a first port, a second port, a third port and a fourth port, the first low-pass branch is arranged between the first port and the second port; the first high-pass branch is arranged between the first port and the third port; the second low-pass branch is arranged between the third port and the fourth port; the second high-pass branch is arranged between the second port and the fourth port; the first low-pass branch and the second low-pass branch have the same structure, and the first high-pass branch and the second high-pass branch have the same structure; the first low-pass branch, the first high-pass branch, the second low-pass branch and the second high-pass branch are sequentially connected end to end to form a loop main line of a closed-loop structure. According to the invention, the low-pass branch and the high-pass branch which are completely complementary in filtering characteristics are established, and the transmission responses of any one port to the two adjacent ports are respectively complementary, so that the influence caused by stop-band reflection signals can be effectively reduced.