A system for optical wireless power transmission to a power receiving apparatus generally situated in a mobile electronic device. The transmitter has an optical resonator with end reflectors and a gain medium positioned between them, such that an optical beam is generated. The frequency of the beam is selected such that it is absorbed by almost all transparent organic materials in general use. A beam steering unit on the transmitter can direct the beam in any of a plurality of directions, and the beam is absorbed on the receiver by means of an optical-to-electrical power converter, through a low reflection surface. The band gap of this power converter is selected to be smaller than that of the gain medium. The receiver has a voltage converter including an inductor, an energy storage device and a switch. A beam steerer controller ensures that the beam impinges on the receiver.

System for optical wireless power supply

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.

Two quantum cascade laser spectrum-based multicomponent gas simultaneous detection device and method

The invention provides a system for monitoring a variety of dangerous gases based on absorption spectrum remote sensing technology. The system comprises an aerial system and a ground system, wherein the aerial system comprises an aircraft platform and a laser radar module carried on the aircraft platform; the laser radar module comprises a laser emitting submodule, a laser echo receiving submodule and a gas concentration self-calibration submodule. The system is capable of simultaneously detecting a variety of dangerous gases and determining the concentration of each dangerous gas; the system is carried by the aircraft and can work in the air away from the ground; the backward tracing functions of detecting and locating leakage sources of the dangerous gases and the safety distance of the diffusion of the dangerous gases can be achieved; the real-time distribution map and the diffusion tendency map of different dangerous gases at each space point position can be accurately drawn on an electronic map in real time.

System for monitoring a variety of dangerous gases based on absorption spectrum remote sensing technology

The invention discloses a device and a method for detecting the oxygen content in a glass medicine bottle According to technical scheme, a DFB laser device is subjected to current tuning, so that the light efficiency of laser comprehensively scans places near to the absorption line of oxygen; the laser device is matched with a TO5 encapsulation part and outputs laser beams with high energy density through a collimating lens assembly; a single light path is opened to penetrate through the glass medicine bottle to be detected within a short light path length; the laser beams are converted into an electric signal through a photoelectric diode by a focusing lens assembly A weak signal detection part takes a high-precision phase lock amplifier as a core and outputs digital information of second harmonic; the digital information is transmitted to an industrial control computer for smooth data filtration and background deduction of an open space through a communication module; characteristic values are extracted and transmitted to a built concentration inversion model for processing to accurately measure the oxygen content in the glass medicine bottle The single-light-path gas absorption system can detect oxygen residues in the colorless glass medicine bottle with the diameter greater than 16 mm

Device and method for detecting oxygen content in glass medicine bottle

A self-adaption reflection-type infrared laser industrial dangerous leaking gas monitoring device comprises a shell and a visual sighting telescope arranged above the shell and is characterized by further comprising a probe, a power-driven servo cradle head, a control box and a corner reflector, wherein the probe is arranged in the shell and integrates receiving and transmitting of a laser red light beam and a laser infrared detection light beam, the shell is arranged on the power-driven servo cradle head, and the probe is electrically connected with the power-driven servo cradle head and the control box; the corner reflector and the probe are arranged at the two ends of a detection optical path respectively; the corner reflector and main light rays of an outgoing beam of a first off-axis paraboloid mirror in an upper chamber of the shell are coaxial

Self-adaption reflection-type infrared laser industrial dangerous leaking gas monitoring device

The invention discloses mid-infrared spectroscopy-based trace gas detection method and device combining a long-optical-path open light path with a wavelength modulation technique. The detection device mainly consists of a continuous wave quantum cascade laser (CW-QCL), a laser driving and controlling unit, a plane mirror, a beam splitter, a visible laser, a reference gas pool, mercury, tellurium and cadmium (MCT) detector, an off-axis parabolic mirror, a corner reflector, a digital lock-in-amplifier and a computer. By using the CW-QCL as a light source, long-optical-path open light path is combined with the wavelength modulation technique to detect multi-component trace gas with high sensitivity.

Mid-infrared spectroscopy-based trace gas detection method and device combining long-optical-path open light path with wavelength modulation technique

We have developed a portable near-infrared laser heterodyne radiometer (LHR) for quasi-simultaneous measurements of atmospheric carbon dioxide (CO2), methane (CH4), water vapor (H2O) and oxygen (O2) column absorption by using three distributed-feedback diode lasers as the local oscillators of the heterodyne detection. The developed system shows good performance in terms of its high spectral resolution of 0.066 cm-1 and a low solar power detection noise which was about 2 times the theoretical quantum limit. Its measurement precision of the column-averaged mole fraction for CO2 and CH4 is within 1.1%, based on the standard deviation from the mean value of the retrieved results for a clean sky. The column abundance information of the O2 is used to correct for the variations and uncertainties of atmosphere pressure, the solar altitude angle, and the prior profiles of pressure and temperature. Comparison measurements of daily column-averaged atmospheric mole fractions of CO2, CH4 and H2O, between our developed LHR and a greenhouse gas observing satellite, show a good agreement, which proves the reliability of our developed system.

Development of a laser heterodyne spectroradiometer for high-resolution measurements of CO 2 , CH 4 , H 2 O and O 2 in the atmospheric column

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

Handheld laser drunk-driving telemetering and pre-warning system

The invention discloses a wavelength modulating-TDLAS based high-sped air flowing speed detecting system. The system comprises a laser module, a high speed air flowing module, a signal acquiring and data processing module and an upper computer; two lasers transmitted by the laser module are positioned in the same side of the high speed air flowing speed direction, one laser is in the high speed air flowing speed direction, and another laser is reversed to the high speed air flowing speed direction; both lasers are in included angles of 90 degrees to the high speed flowing speed; the signal acquiring and data processing module at the back of the high speed air flow is used for receiving and processing an absorbing spectrum secondary harmonic signal of the high speed air flow in order to obtain high speed air flow information. The system is simple to operate and high in measurement precision, can remove the influence of a background signal, laser strength fluctuation and photoelectric amplifying coefficients and other factors, can solve the problem of interference on air flow due to indirect contact with an air source in measurement of high speed air flow at present, and is applicable to detection in high temperature, high flowing speed, vibrating and other terrible environments, and thus the applicable scope of the WMS technology can be expanded.

Yao Lu

Papers

Mid-infrared spectroscopy-based trace gas detection method and device combining long-optical-path open light path with wavelength modulation technique

Development of a laser heterodyne spectroradiometer for high-resolution measurements of CO 2 , CH 4 , H 2 O and O 2 in the atmospheric column

Handheld laser drunk-driving telemetering and pre-warning system

Wavelength modulating-TDLAS based high-sped air flowing speed detecting system

Laser roadway online monitoring system for drunk driving