145 results about "Pulse intensity" patented technology

The present invention produces a combustion simulation of flames, burning logs and embers in a fuel-burning fireplace or like device. One or more light source(s), such as LEDs, are used to transmit light to and through: a flame cut-out panel or flame cut-out mask to simulate the flame effect; cut-outs in logs to simulate a burning edge of a log; elements or refractories that refract the light to simulate real burning embers. Fiber optic cables, or any other material that facilitates the transmission of light, may be used to assist in transmitting the visible light. A motor driven rotating disk that includes apertures may be used to fragment the transmission of the visible light. In addition, the light source may be controlled by a sequencing device to closely approximate the pulsing intensities of light seen in actual flames, the edges of burning logs, and ember beds.

A novel method for high power optical amplification of ultrashort pulses in IR wavelength range (0.7-20 Ãm) is disclosed. The method is based on the optical parametric chirp pulse amplification (OPCPA) technique where a picosecond or nanosecond mode locked laser system synchronized to a signal laser oscillator is used as a pump source or alternatively the pump pulse is created from the signal pulse by using certain types of optical nonlinear processes described later in the document. This significantly increases stability, extraction efficiency and bandwidth of the amplified signal pulse. Further, we disclose five new practical methods of shaping the temporal and spatial profiles of the signal and pump pulses in the OPCPA interaction which significantly increases its efficiency. In the first, passive preshaping of the pump pulses has been made by a three wave mixing process separate from the one occurring in the OPCPA. In the second, passive pre-shaping of the pump pulses has been made by spectral filtering in the pump mode-locked laser or in its amplifier. In the third, the temporal shape of the signal pulse optimized for OPCPA interaction has been actively processed by using an acousto-optic programmable dispersive filter (Dazzler) or liquid crystal light modulators. In the fourth alternative method, the signal pulse intensity envelope is optimized by using passive spectral filtering. Finally, we disclose a method of using pump pulses which interact with the seed pulses with different time delays and different angular orientations allowing the amplification bandwidth to be increased. In addition we describe a new technique for high power IR optical beam delivery systems based on the microstructure fibres made of silica, fluoride or chalcogenide glasses as well as ceramics. Also we disclose a new optical system for achieving phase matching geometries in the optical parametric interactions based on diffractive optics. All novel methods of the ultrashort optical pulse amplification described in this disclosure can be easily generalized to other wavelength ranges.

A method and system for eye-safe near infra-red (NIR) optical imaging illumination. An eye of an intended subject are imaged with visible light or NIR light at an unconditionally eye-safe illumination level and the maximum permissible eye-safe NIR illumination that can be applied to the eye is determined from the captured images. The eye of the intended subject can then be illuminated with at least one substantially maximal NIR light pulse having a pulse intensity and duration selected to provide the substantially maximum permissible eye-safe NIR illumination intensity at the eye. NIR light pulse illumination can be inhibited in response to detection of other subjects either within the vicinity of a volume extending between an NIR illuminator illuminating the eye and the intended subject. The likelihood that an intended subject has been recently illuminated can also be determined and statistical measures can be used to avoid re-illuminating subject unnecessarily.

The invention discloses a stress and emotion regulating method and system in order to overcome the disadvantages in an existing HRV biofeedback training system. The stress and emotion regulating system comprises a stress testing unit for acquiring the stress test result; a regulating unit for offering correspondent regulation proposal from multiple preset regulation proposals to implement relative to different stress test results; a physiologic signal collecting unit for collecting a physiologic signal representing the heart rate on a real-time basis, a physiologic signal representing the saturation of blood oxygen, and a physiologic signal representing the pulse intensity as the feedback signal for regulation during the implementation of the regulation proposal, and converting the feedback signal into a feedback parameter value; and a data processing unit for generating the regulated result based on the feedback parameter value. The invention also provides a physiologic signal collecting device for collecting three physiologic signals of the heart rate, the saturation of blood oxygen and the pulse intensity of a human body closest to the stress and the emotion so as to help a user to carry out regulation train.

In order to provide a low-loss optical switch that is low in power consumption by providing the same as a self-holding type, and high speed and highly practicable, an optical switch of the present invention is composed of a quartz substrate (101), first and second input waveguides (102a and 102b), a first directional coupler (103), first and second arm waveguides (104a and 104b) of a Mach-Zehnder interferometric circuit, a second directional coupler (105), first and second output waveguides (106a and 106b), and a phase change material portion (100). A control light (for an amorphous to crystal transition) pulse (pulse width: 20 ns, pulse intensity: 5 mW) having a wavelength of 0.78 microns is irradiated. As a result of the control light pulse irradiation, the phase change material portion (109) changes in phase to a crystal state, and the optical switch transits to a bar condition.

The present invention provides a disc player comprising one or more light sources that project a constant or pulsing light onto the upper portion of a disc being played by the disc player. If a constant light source is used, the a pulsing viewing port for the disc receptacle of the disc player is employed. The pulse frequency, pulse length, pulse period, pulse interval, pulse color, pulse intensity or a combination thereof of the light source or the pulse frequency, pulse length, pulse period, pulse interval, or light transmissivity of the one or more viewing ports can be synchronized with the rotation of the spindle or platen in the disc player, with the optical data stored, or with the rotation of an image precursor on the disc. When the disc is viewed through a viewing port while the disc is being played, a two-dimensional or three-dimensional discrete image is formed by the persistence of vision. The disc player can also include an anti-piracy system to prevent unauthorized playing of digital/optical disc content. The anti-piracy system includes a verification system and access control data. When permission granting information is obtained from the disc, the verification system compares it to the access control data and either allows or disallows the disc player to play the disc.

An intelligent high-voltage pulse generator for generating high-voltage square-wave pulses with adjustable width, frequency and amplitude is composed of bridge rectifier, filter, HF bridge inverter, pulse step-up circuit and high-voltage pulse output circuit, single-chip microprocessor system, RS232 serial interface, PC, keyboard controller, LCD, buzz alarm, bridge driver, over-voltage and over-current protector, and PWM pulse generator. Its electric connection scheme is also disclosed.

This aims to shorten the time period, which is required for optimizing a radio-frequency magnetic field pulse intensity, thereby to shorten the measurement time period of an MRI entirety.

In the operation for optimizing the radio-frequency magnetic field pulse intensity, an initial state for applying radio-frequency magnetic field pulses is intentionally created for a short time period, thereby to shorten the radio-frequency magnetic field pulse interval for the repeated applications.

The radio-frequency magnetic field pulses are repeatedly applied at a predetermined time interval sufficiently shorter than the relaxing time period of the radio-frequency magnetic field pulses, and the state in which the magnetic resonance signal intensity becomes a threshold value or less is set to an initial state.

The invention discloses a method and a device for generating a high-precision optical fiber optical comb seed pulse through full-optical difference frequency. The method is integrated with the processes of optical fiber ultrashort pulse generation, high-power optical fiber amplification, optical fiber non-linear frequency mixing, optical difference frequency and frequency doubling and the like; the device comprises a laser oscillator, a six-wave mixing amplifier, an optical comb difference frequency device and an optical comb frequency doubling device. Laser pulse finally output by the device is extremely close to system initial seed light frequency, and the carrier envelope phase is stable, so that the device can be directly taken as a seed optical comb of an optical fiber amplifier of a wave band corresponding to signal light. Two signal light required in the difference frequency process comes from the same non-linear mixing process, so that the phase noise of the signal light generated during the difference frequency can be automatically eliminated, and optical comb laser with high pulse strength and high contrast ratio, in which the infrared band carrier envelope phase is zero, is obtained.

The stimulated Raman scattering detection apparatus includes first and second light pulse generators (1, 2) respectively generating first and second light pulses with first and second pulse periods, an optical system combining the first and second light pulses and focusing the combined light pulses onto a sample, and a detector (10) detecting the second light pulses intensity-modulated by stimulated Raman scattering generated by focusing of the combined light pulses onto the sample. The second light pulse generator divides each raw light pulse emitted with the second pulse period into two light pulses, delays one of the two light pulse with respect to the other thereof and combines the one light pulse divided from one raw light pulse and delayed, with the other light pulse divided from another raw light pulse emitted after the one raw light pulse, to generate the second light pulse.

The invention discloses a handheld cortex egersimeter and a cortex electrostimulation. In the cortex egersimeter, a parameter setting circuit and a parameter display circuit are connected with a master control chip, a control end of a bipolar voltage controlled constant current source circuit is connected with a digital-to-analog conversion output port of the master control chip, and an output end of the bipolar voltage controlled constant current source circuit is connected with one end of a stimulating electrode; an input end of a current-to-voltage conversion circuit is connected with the other end of the stimulating electrode, and an output end of the current-to-voltage conversion circuit is connected with an analog-to-digital conversion input port of the master control chip; a real pulse intensity display circuit is connected with the master control chip; an input end of a bipolar voltage generation circuit is connected with another digital-to-analog conversion output port of themaster control chip, and an output end of the bipolar voltage generation circuit is connected with the bipolar voltage controlled constant current source circuit. The method can be used for applying bidirectional pulse simulation with specific frequency, pulse width and current to cortex. The invention has low cost, is simple for operation and does not need the assistance of a computer; in addition, the cortex egersimeter has high safety coefficient and can improve the postoperative life quality of patients with functional region pathological changes.

An underwater optical communication system and method based on single photon detection and circular polarization modulation are provided, the system comprises a computer, a transceiver circuit, a self-stabilizing holder and an optical antenna, comprises a polarization demodulation optical path and a polarization modulation optical path. Beacon light is emitted from one end, received by a telescopeat the other end and recorded to form an imaging light spot position, and fine tracking is carried out accordingly; during communication, the combined light at one end is changed into circularly polarized light and then emitted to the telescope at the other end through the telescope; the signal light is converted into horizontally polarized light or vertically polarized light after being received, and enters the detector I or the detector II. Left-handed and right-handed polarization modulation is adopted. The system is composed of two same devices. The device can be used for water surface and underwater communication or underwater and underwater communication. Based on the single-photon detection technology, the detection precision of optical signals can be improved to the single-photonmagnitude, the underwater optical communication distance is effectively prolonged on the premise that the pulse intensity of emitted light is kept unchanged, and effective transmission of informationis guaranteed by adopting a circular polarization modulation method and a corresponding error correction scheme.

By use of a pump light source for repeatedly generating a pump light pulse and a probe light source for repeatedly generating a probe light pulse in a shorter repetition time interval than the pump light pulse, the pump light pulse is repeatedly irradiated on a sample, and the probe light pulse is repeatedly irradiated on the sample every time the pump pulse is irradiated. An intensity of a probe light pulse having passed through the sample is detected. A shift in a delay time of the probe light pulse with respect to the pump light pulse is measured every time the pump light pulse is irradiated. Transient absorption measurement data of the sample is obtained based on the detected data of the probe light pulse intensity obtained in higher time density than repetition time density of the probe light pulse based on the measured shift in the delay time.

Multi-beam pattern generators employing processors to vary delivered dose of writing beams according to photoresist thicknesses, and associated methods are disclosed. A pattern generator may write a pattern upon a substrate having a photoresist which is sensitive to the writing beams. The pattern may be written in respective writing cycles when the writing beams write at least a portion of the pattern at writing pixel locations. A beam actuator of the pattern generator may independently direct the writing beams to the writing pixels to deliver respective pixel doses during each writing cycle. Pixel doses delivered may be adjusted according to a thickness of the photoresist at various writing pixel locations according to one or more approaches, using one or more of: actuator dwell times, emitted pulse duration, emitted pulse frequency, and emitted pulse intensity. In this manner, additional dimensional control is provided for substrates having variable photoresist thicknesses.

The invention provides a multifunctional neck massager. The multifunctional neck massager comprises a collecting module and a main control module, wherein the collecting module is used for collecting pulse intensity of the human body neck artery; the main control module is connected with the collecting module and used for receiving the pulse intensity and frequency sent by the collecting module, converting the pulse intensity into human body blood pressure and the pulse frequency into human body heart rhythm and sending the human body blood pressure and the human body heart rhythm to a terminal device so that the terminal device can display the human body blood pressure and the human body heart rhythm. The pulse intensity and frequency of the human body neck artery are collected through the collecting module and sent to the main control module, the main control module converts the pulse intensity into the human body blood pressure and the pulse frequency into the human body heart rhythm, the human body blood pressure and the human body heart rhythm are displayed through the terminal device to be checked by a user at any time so that the user can effectively check health index data such as the human body blood pressure and the human body heart rhythm while massaged, and the requirement of monitoring the body health indexes in real time in real time of the user is met.

A method and system for self-synchronizing an optical packet network by selecting a seed pulse from among the data pulses within a packet having no synchronization marker, transforming the seed pulse to be optically distinguishable from the remaining data pulses after the packet has been transmitted, and extracting that seed pulse for use in synchronizing the operation of the network. In one embodiment, the process is practiced using a intensity modifier (such as a fast-saturation, slow-recovery amplifier) to modify the seed pulse intensity, and an intensity discriminator (such as an unbalanced NOLM, or a dispersion-shifted fiber and bandpass filter) to extract the differentiated seed pulse.

The invention relates to a three-dimensional imaging method, particularly relates to a pulse intensity correlation three-dimensional imaging method based on a deep learning model and belongs to the technical field of photoelectric imaging. The invention aims to solve the problems that a conventional pulse intensity correlation three-dimensional imaging method is low in imaging rage and poor in imaging quality when being operated in a strong noise environment represented by strong turbulence. Through adoption of the deep learning model, the method, compared with a conventional correlation imaging method combining compressed sensing, has the advantages that high-quality low-noise reconstructed image output under a small number of correlation times can be realized and the anti-noise capability and the robustness are high.

The invention discloses an asymmetric double-field quantum key distribution method through wide-area coordination control and a system. The method comprises the following steps: acquiring at least twolegal users Alice and Bob; determining pulse intensities and random phases of Alice and Bob in a decoy window, and judging whether the pulse intensities and the random phases are effective response events or not; according to the pulse intensity and the random phase, modulating the signal pulse and the decoy state pulse into different intensities and issuing the intensities; according to the modulated result and when it is determined that the event is an effective response event, respectively obtaining the lower bound Y1L and the error rate e1 of the single photon counting rates of Alice andBob; and performing error correction and privacy amplification on the lower bound Y1L and the error rate e1 of the single photon counting rate, determining a key generation rate and a final key, and finishing distribution. The method has the advantages that compared with the mode that an asymmetric channel is converted into a symmetric channel and an original symmetric protocol is utilized, the secret key generation rate and the transmission distance are effectively increased.

The invention provides a supermode noise suppression method for active mode-locked lasers. The supermode noise suppression method includes steps of S1, separating out a part of optical signal pulses output by an active mode-locked laser, using the pulses to serve as pulse intensity feedforward signals, and inputting into a pulse intensity feedforward device; S2, adjusting the pulse intensity feedforward signals through the pulse intensity feedforward device so that optical pulse signals are converted into electric pulse signals and the electric pulse signals and the optical pulse signals in the active mode-locked laser are simultaneously input into an MZM (Mach-Zehnder modulator); and S3, adjusting amplitude of the optical pulse signals of the active mode-locked laser according to the optical pulse signals and the electric pulse signals received from the step S2, and obtaining stable optical pulse signals. The supermode noise suppression method can effectively suppress supermode noise in an active mode-locked laser cavity, and performance of the active mode-locked laser is further improved.