302 results about "High frequency modulation" patented technology

Structures and methods for three-dimensional image sensing using high frequency modulation includes CMOS-implementable sensor structures using differential charge transfer, including such sensors enabling rapid horizontal and slower vertical dimension local charge collection. Wavelength response of such sensors can be altered dynamically by varying gate potentials. Methods for producing such sensor structures on conventional CMOS fabrication facilities include use of “rich” instructions to command the fabrication process to optimize image sensor rather than digital or analog ICs. One detector structure has closely spaced-apart, elongated finger-like structures that rapidly collect charge in the spaced-apart direction and then move collected charge less rapidly in the elongated direction. Detector response is substantially independent of the collection rate in the elongated direction.

Selective high-frequency spinal chord modulation for inhibiting pain with reduced side affects and associated systems and methods are disclosed. In particular embodiments, high-frequency modulation in the range of from about 1.5 KHz to about 50 KHz may be applied to the patient's spinal chord region to address low back pain without creating unwanted sensory and/or motor side affects. In other embodiments, modulation in accordance with similar parameters can be applied to other spinal or peripheral locations to address other indications.

The invention discloses an optical fiber distributed multi-point methane real-time monitor based on the light wave modulation spectrometry and the monitoring method, a semiconductor DFB laser, an optical fiber splitter, a gas calibration pond, a laser control circuit board, a signal generative circuit board, a lock-in amplified board, a data acquisition card, a control module, a multi-channel analog signal selection switch and a driving circuit are arranged in the main case of the monitor, the main case is connected with miniature optical sensors in various underground detection optical path through dingle mode fibers. The wavelength modulation of a gas laser absorption spectrum is realized by a low frequency scanning signal and a high frequency modulation signal generated by a signal generative circuit. The laser wavelength shift is carried out adaptive adjustment by the built-in gas calibration pond so as to realize the locking of a methane absorption line. The distributed multi-point methane concentration monitoring in the underground coal mine is realized by the switching of the multi-channel analog signal selection switch.

The invention provides a multifunctional power electric transformer. The multifunctional power electric transformer is divided into three levels, namely an input level, an isolation level and an output level, wherein the input level adopts an H bridge cascaded topological structure to meet the requirements on different input voltage levels; the isolation level adopts a mode of parallel connection of a plurality of high-frequency transformers, the DC/AC high-frequency modulation and the AC/DC high-frequency modulation in an isolation link both adopt a single-phase fully controlled half-bridge structure to save switch parts; the output level consists of one or more three-phase voltage source convertors which are connected in parallel, so that the multi-output can be realized according to the need of a load; and the convertors of the output level are also connected with an LC wave filter to improve the waveform quality of the voltage and the current. The whole device fully adopts technically mature power parts, and each layer cascaded with the input level and the corresponding isolation level can be combined into a convertor, thereby facilitating the design and the production of the convertors. Besides simple functions of voltage conversion and isolation and energy transfer, which can be realized by the conventional transformer, the multifunctional power electric transformer can also realize other novel functions meeting the needs of a power system.

A half bridge gate driving circuit for providing gate driving circuits in a bi-hecto celcius (200 degrees celcius) operating environment having multiple functions including combinations of multiple level logic inputs, noise immunity, fault protection, overlap protection, pulse modulation, high-frequency modulation with transformer based isolation, high-frequency demodulation back to pulse width modulation, deadtime generator, level shifter for high side transistor, overcurrent protection, and undervoltage lockout.

The present invention relates to the technical field of laser spectrum detection and gas detection, and in particular relates to a two quantum cascade laser spectrum-based multicomponent gas simultaneous detection device and method. An arbitrary waveform function generator outputs a periodic signal which only superposes high-frequency modulation signals in any half period to be used as a laser current signal, a room temperature continuous mode mid-infrared quantum cascade laser is driven by a current control unit, the laser emits a laser signal, the laser signal passes sequentially through a focusing collimating three-dimensional adjustment system, a first mirror, a sample absorption pool and a off-axis parabolic mirror to be reflected to a first detector, the first detector passes the laser signal through a data acquisition unit to convert into an electrical signal and transmit to a computer, and information of the gas to be measured can be obtained by analysis and processing of the electrical signal by the computer. The devices simultaneously utilizes two spectrums for gas detection, and has the advantages of high detection sensitivity, high detection accuracy, no need of external standard gas calibration, simple optical path adjustment, fast response, and stability, and the like.

The invention belongs to the field of medical equipment, is used for the intensity modulated radiation therapy of tumors and particularly relates to a double-layer multi-blade collimator. The double-layer multi-blade collimator comprises a switching multi-blade collimator on the upper layer and an electric multi-blade collimator on the lower layer; both the switching multi-blade collimator and the electric multi-blade collimator consist of two groups of opposite blades; the front end face of each blade of the switching multi-blade collimator is a straight end face and the rear end of the blade of the switching multi-blade collimator is connected with a micro electromagnetic driving mechanism; each blade of the electric multi-blade collimator is driven by a micro motor; and the blades of the switching multi-blade collimator and the blades of the electric multi-blade collimator move, are laid out in the same direction and have the same numbers. The double-layer multi-blade collimator is applied to a tumor intensity modulated radiation therapy device and has the advantages of simple structure, beam collimation, high working efficiency, high frequency modulation resolution and high safety.

The invention discloses a ranging device based on a laser phase method, and the ranging device provided by the invention comprises a laser emitting and electro-optical modulating module, an internal-external optical path module, and a photoelectric detecting and data processing module, wherein the laser emitting and electro-optical modulating module is used for emitting an infrared laser subjected to high frequency modulation, the internal-external optical path module comprises an internal optical path and an external optical path; the infrared laser is transmitted to the photoelectric detecting and signal processing module respectively through the internal optical path and the external optical path; the photoelectric detecting and signal processing module is used for respectively performing the conversion and frequency-conversion process on the two transmitted optical signals to obtain a phase difference between two optical signals so as to obtain a to-be-measured distance value. Thedevice directly transmits the light emitted by the laser to an integrated electro-optical modulator through an optical fiber; an exit beam is transmitted to the focus point of a range finder emittinglens through the optical fiber so as to greatly simplify the optical path structure; and meanwhile, the modulation frequency of the integrated electro-optical modulator is much higher than the directmodulation frequency of the laser, thereby achieving higher measurement precision.

An atmospheric visibility measuring system is characterized in that the system can realize full-scale precise measurement of atmospheric visibility. The system adopts a measurement structure with a single light source and double baselines; a light source transmitting terminal and two signal receiving terminals are integrated into a whole body, which reduces the complexity of optical path debugging and measurement electronic system design, reduces requirements for field installation, improves system practicality, and reduces equipment cost. Meanwhile, the laser light source is subject to high frequency modulation, and an optical filter is installed in the front of a detector, which improve the system capability of resisting background light and stray light influence. In the signal sampling part, synchronous demodulation weak signal detection technology is adopted, which improves the measurement precision and measurement range of the system. The atmospheric visibility measuring system of the invention is applicable to industries of meteorological stations, airports, highway, harbours, atmosphere environment monitoring, and the like.

The invention discloses a high-frequency electromagnetic water purification system in the technical field of clean water treatment, which comprises a high-frequency modulation wave generator, a voltage pre-amplifier, a high-frequency power amplifier, an electromagnetic water energy converter, a state parameter monitor, a signal processor and a stabilized power supply. The high-frequency electromagnetic water purification system can effectively prevent and remove scale from the wall of a water pipe, can detect the water flow and electrical conductivity of a circulating water system in real time, and can conduct identification and operation according to the water flow and the electrical conductivity so as to determine the best electromagnetic energy power to be transmitted to the treated water quality; therefore, the effects of high efficiency and energy saving are achieved when the water treatment is implemented.

An integrated data jitter generator for the testing of high speed serial interfaces is provided. A transmit timing generator for use in a transmit data path includes a high frequency clock generator such as a phase-locked loop or a delay-locked loop having an input for receiving an oscillator or reference clock input. A clock modulator receives both an existing low frequency modulation signal and a high frequency modulation signal. A high-speed modulated clock signal is generated to enable jitter testing by a downstream-coupled receiver. Fixed frequencies such as 3, 6, 125, 150, 250, 300, 750, or 1500 MHz are used for the high-speed modulation signal, but any high-speed modulation frequency can be used to generate the desired amount of jitter. Likewise, the amplitude of the high frequency modulation signal can also be varied as desired.

The invention discloses a handheld laser ranging device, which comprises a laser transmitter, a DDS (Direct Digital Synthesizer) frequency generating module, an I/Q (In-phase/Quadrature) modulation module, an APD (Avalanche Photo Diode) frequency mixing receiving module, a low frequency amplifier module and a microcontroller module, wherein the laser transmitter transmits laser ranging signals to a to-be-measured object; the DDS frequency generating module provides the laser transmitter with high frequency modulation signals; the I/Q modulation module modulates the high frequency modulation signals and outputs the modulated signals; the APD frequency mixing receiving module receives the laser ranging signals that are sent back from the to-be-measured object, the laser ranging signals and the modulated signals are processed through frequency mixing, and low frequency signals with phase differences are output; the low frequency amplifier module converts the low frequency signals to low frequency voltage signals; and in addition, the microcontroller module generates and outputs I/Q signals, receives the low frequency voltage signals, processes the low frequency voltage signals through phase detection, and obtains distance signals of the to-be-measured object so as to output the distance signals. The handheld laser ranging device has the advantages of small size, low power consumption, accurate measurement, high speed and the like, and is especially suitable for the fields such as industrial setting, estate measurement, construction technology, upholstery.

The invention discloses a rubidium atomic microwave clock based on Faraday laser pumping. By using a Faraday external cavity laser technique with wavelength operated on a rubidium atomic transition spectral line, frequency of output laser is homogenized through high frequency modulation and applied to a pumping source of a rubidium atomic microwave clock so as to obtain a rubidium atomic microwaveclock based on Faraday laser pumping, wherein wavelength of laser generated by a Faraday laser unit is capable of highly stably operating on the rubidium atomic transition spectral line and is insensitive to operating current and temperature of a laser tube; the rubidium atomic microwave clock uses Faraday laser as pumping light, the operating mode that a traditional laser pumped rubidium atomicmicrowave clock requires a servo locking circuit system to stabilize the frequency during laser pumping is subverted, the international problems in laser loss of lock related to laser frequency stabilization are thoroughly solved, and long-term continuous reliable operation is available within a lifetime of the laser tube.

A base-station amplifier device for use in amplifying at least one channel to be transmitted from a base station is provide to solve deterioration in radio characteristic caused due to variation of peak signal. The base-station amplifier device comprises: amplitude limiting means for amplitude-limiting a base band signal every said channel; high-frequency modulating means for performing a high-frequency modulation on an output from said amplitude limiting means every said channel; adding means for adding outputs from all of said high-frequency modulating means; amplifying means for amplifying an output from said adding means; and amplitude controlling means for controlling said amplitude limiting means based on characteristic of said amplifying means.

The invention discloses a GPS synchronous clock carrier power source, comprising a synchronous clock module, a modulation module, a DC power module, carrier power transmission lines, and N demodulation modules, wherein, the carrier power transmission lines are used for transmitting high-frequency modulation synchronous clock signals; and N is the total number of accessed synchronous measurement and control devices. The GPS synchronous clock carrier power source modulates a synchronous clock signal, such as IPPS pulse per second and UTC time information, output by the synchronous clock module based on a GPS receiver and the DC power into a carrier power with a synchronous clock, and transmits the carrier power with the synchronous clock into various synchronous measurement and control devices in a monitor terminal substation of a power system; the synchronous measurement and control devices obtain high-precision synchronous clock signals and DC power needed in working through the carrier power transmission lines. The GPS synchronous clock carrier power source of the invention can simplify the structure of a field synchronous measurement and control device, leaves out the power module and the GPS receiver, reduces the cost, and can lead the layout of a synchronous measurement and control system in the terminal substation to be more compact, flexible and reasonable.

The invention discloses a light emitting unit, an optical signal detection module, an optical system and a laser radar system. The light emitting unit comprises a light source subunit, a high frequency modulation subunit and a difference frequency subunit; the light source subunit emits an initial light beam; the high frequency modulation subunit modulates the frequency of the initial light beam via a photomixing technology, and emits at least two different frequencies of high frequency emission signals; the difference frequency subunit caries out difference frequency processing on two randomfrequencies of high frequency emission signals, and emits at least one type of low frequency emission signal; and at least one type of high emission signal and at least one type low frequency emissionsignal as detection light signals are emitted by the light emitting unit. Thus, the initial light beam emitted by the light source subunit is modulated via photomixing and difference frequency technologies, time for light beam modulation is shortened, the detection light signals are emitted at a higher speed, and the detection speed of the laser radar system is improved.

The invention discloses a handheld laser drunk-driving telemetering and pre-warning system comprising a body. The body is internally provided with a DFB (Distributed Feed Back) laser and is externally provided with a laser emission button which is electrically connected with the DFB laser and a control module of the DFB laser; a receiving telescope is arranged on the side wall of the body, and a beam collimator is arranged in a lens cone of the receiving telescope; the DFB laser is connected with the beam collimator by virtue of optical fibers; and a photoelectric detector is arranged at the rear end of the receiving telescope, and the signal output of the photoelectric detector is connected with a signal acquisition and processing module. When the handheld laser drunk-driving telemetering and pre-warning system is used, emitted light beams are aligned with an area to be metered, the metering can be finished quickly by high-frequency modulation of a light source, and a user can perform judgment rapidly according to the displayed result and completely control the starting of the metering. The handheld laser drunk-driving telemetering and pre-warning system can be used for performing real-time telemetering on alcohol concentration on a small scale.