57results about How to "Increased absorption pathlength" patented technology

The invention discloses a non-disperse infrared multi-component flue gas analyzer. In the non-disperse infrared multi-component flue gas analyzer, a light source with similar black body radiation characteristic is adopted and can cover infrared absorption bands of all component gases to be tested and interfered component gases; high-stability light source emission is realized by designing a voltage-stabilizing and current-stabilizing circuit; an optically filtering wheel is provided, so double effects of optically filtering and modulating light waves are achieved, and stability and measuring accuracy of a system are improved; concentration of various gases in the flue gas can be measured at the same time by reasonably selecting parameters of optical filters; a water vapor measuring channel is introduced on the optically filtering wheel, so an analyzer can work in the damp environment normally; a sample pool adopts a multi-time reflection pool structure, so gas absorption optical distance is increased and detection sensitivity of the system is improved; and the sample pool adopts a heating and temperature control system, so water vapor condensation and combination of the water vapor and acidic gases to be tested such as sulfur dioxide (SO2) and nitrogen dioxide (NO2) are avoided, and measuring accuracy and corrosion resistance of the system are improved.

The invention relates to a fibre optic gas detector for the fire hazard of a coal gab area, comprising a light source, a probe, a photodetector and a signal processing unit, wherein light emitted by the light source is led into the photodetector by the probe so as to be converted into electrical signals, and the electrical signals are led into the signal processing unit to be processed. The fibre optic gas detector is characterized in that an optical circulator is arranged on a light path between the light source and the probe, the light source is connected with the first port of the optical circulator, the probe is connected with the second port of the optical circulator, the third port of the optical circulator is connected with a photoelectric converter, the probe is of a multi-time reflection type white cell structure, and a terminal optical fiber collimator and a fibre reflecting mirror are arranged on the exit end of the white cell.

The invention discloses a stable compact type laser-transceiving integrated detection light path structure. The stable compact type laser-transceiving integrated detection light path structure comprises a laser transceiving device and a pyramid reflector device, wherein laser output by a host laser of a monitor is coupled by an external transmission optical fiber flange, so as to enter a tail fiber in a covering cylinder, the laser is conducted to a laser alignment mirror by the tail fiber, the laser is emitted from a receiving mirror in a center opening after being aligned, passes through a sealing window mirror and a target gas detection area and then arrives at an opposite pyramid reflector of the pyramid reflector device, so as to form a reflected light beam and return along the direction of a main light path, the extended return light beam is received and laterally reflected and focused by the receiving mirror, so as to arrive at a receiving lens and a detector which is used for detecting an optical signal of a receiving spectrum, and an electrical signal output by the detector is transmitted to an output interface by virtue of a connecting wire and then transmitted to a host by virtue of an external cable. According to the stable compact type laser-transceiving integrated detection light path structure, a spectral absorption optical path is doubled, the detection precision can be increased, the application range can be extended, and the anti-vibration performance is obviously improved.

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.

A vacuum cavity for tunable diode laser absorption spectroscopy (TDLAS) temperature measurement and calibration is characterized by comprising an upper vacuum chamber and a lower vacuum chamber which are separated by a transmission lens. A reflecting mirror is arranged at the bottom of the lower vacuum chamber, a testing gas feeding port and a vacuum obtaining system connector are respectively arranged on a lateral wall of the lower vacuum chamber, the testing gas feeding port is connected with a second inflation valve, and the vacuum obtaining system connector is connected with a second isolating valve. A collimator installing frame and a photoelectric detector installing frame are respectively arranged in the upper vacuum chamber, and an optical fiber leading-in port, a vacuumizing port and an argon feeding port are respectively arranged on a lateral wall of the upper vacuum chamber.

The invention discloses a detection head of a spectrophotometer, relating to the spectrophotometer. The detection head of the spectrophotometer has small volume and high sensitivity, can be separated with an instruement host and is played once plugged, is portable; and with the adoption of the detection head of the spectrophotometer, the interference of stray lights is reduced, the immediate detection requirements in field and site are satisfied, and the detection stability can be greatly enhanced. The detection head of the spectrophotometer comprises a shell, an incidence optical fiber, a reference optical fiber, an incidence optical fiber collimator, a light splitting part, an optical reflection part, a return optical fiber collimator, a return optical fiber and a sample chamber. Because an optical fiber type probe is adopted, the anti-interference performance is enhanced with optical fiber transmission. Because a conical reflecting prism is adopted, an integrated multi-optical-pathabsorption optical detection head which has compact structure can be obtained, and therefore, under the condition without increasing the length of a sample chamber, an absorption optical path is enlarged, the interference of stray lights is reduced, the sensitivity is enhanced, and the optical regulation difficulty is also lowered; while, spectrophotometers at home and aboard are all in a single absorption optical path optical detection head. Because a reference optical path is arranged, the detection stability can be greatly enhanced.

The invention belongs to the technical field of trace gas detection, and provides a scattering enhanced gas sensing probe comprising a metal shell, a non-resonant photo-acoustic cavity, a porous scattering medium, a fiber F-P sonic sensor sensitive film, a gold-plated reflector, a photo-acoustic excitation light source incident fiber, a fiber collimator, a fiber F-P sonic sensor detection light source incident fiber, a F-P cavity, an air inlet and an air outlet, wherein the metal shell is detachably connected with one end of the non-resonant photo-acoustic cavity, and the gold-plated reflectoris fixed at the other end of the non-resonant photo-acoustic cavity; the porous scattering medium is filled into the non-resonant photo-acoustic cavity; a groove is formed in one surface of the metalshell and sealed by the fiber F-P sonic sensor sensitive film, and thus the F-P cavity is formed; the metal shell is provided with the fiber F-P sonic sensor detection light source incident fiber andthe photo-acoustic excitation light source incident fiber. The scattering enhanced gas sensing probe can improve the absorption optical distance of the gas, and enhance the detection sensitivity of the trace gas.

The invention provides a sweeping gas path device applied to an optical cavity structure. The sweeping gas path device can be used for respectively guiding sweeping gas (such as high-purity nitrogen or air) in front of high reflective mirrors at two ends of the optical cavity structure, so that the gas containing atmospheric molecules having undetermined concentration inside the optical cavity structure is blocked to directly contact the surfaces of the high reflective mirrors at two ends of the optical cavity structure, reflectivity reduction of the mirror surfaces caused by gas or particle adsorption can be avoided. Based on the device, the optical cavity structure can be used for detecting the concentration of atmospheric molecules by directly detecting optical absorption of atmosphericmolecules, the sensitivity coefficient of detection instrument is not required to be calibrated with standard gas having known concentration, and the concentration of atmospheric molecules and extinction of atmospheric particles can be effectively and conveniently detected. Furthermore, a light is reflected back and forth for multiple times between the two high reflective mirrors to remarkably increase the absorption optical path, absorption of atmospheric molecules can be remarkably increased, and the concentration of atmospheric molecules having ultralow concentration can be effectively detected.

The invention discloses a gas detecting device based on multiple reflection of an integrating sphere. The device comprises an integrating sphere, an optical fiber, a photodetector and a transparent air chamber. The integrating sphere comprises a first hemisphere and a second hemisphere, a first air outlet, a light inlet and a light exit are formed in the first hemisphere, a first lens is arrangedat the light inlet, a second lens is arranged at the light exit, a first air inlet is formed in the second hemisphere, one end of the optical fiber is connected with the first lens, and the other endis connected with a light source; the photodetector is disposed outside the integrating sphere, and the light inlet end is connected to the light exit on the integrating sphere; the transparent air chamber is disposed in the integrating sphere, the transparent air chamber is provided with a second air inlet and a second air outlet which is communicated to the first air inlet on the integrating sphere; the second air outlet is communicated to the first air outlet on the integrating sphere. According to the device, the light is absorbed by the gas through the gas chamber after being reflected multiple times inside the integrating sphere. Since the gas is stored in the gas chamber independently of the integrating sphere, the integrating sphere can be prevented from being corroded by the gas.

The present invention discloses a vehicle dynamic measurement sensing device and method based on the fiber-loop ring-down spectroscopy technology, belonging to the field of fiber sensing and vehicle dynamic measurement. The device comprises a pulse light source, a lead-in fiber, couplers, sensing heads, a transmission fiber, a lead-out fiber, a photodetector, an oscilloscope and a computer for data processing. The couplers also comprise a No.1 coupler and a No.2 coupler. The sensing heads comprise a No.1 sensing head and a No.2 sensing head. A ring resonator is formed by the No.1 coupler, the No.1 sensing head, the No.2 sensing head, and the No.2 coupler through a transmission fiber group. The vehicle dynamic measurement sensing device and the method have the advantages of a simple structure, a novel method, high measurement accuracy and good repeatability, the vehicle dynamic weighing and speed monitoring can be realized, and the device and the method have a broad application prospect in the field of road traffic real-time monitoring.

The invention discloses a laser multi-reflecting and absorbing tank for high-temperature gas detection, which comprises an absorbing tank tube. A front cavity mirror is provided at a front end insidethe absorbing tank tube. A rear cavity mirror is provided at a rear end inside the absorbing tank tube. A detector and a laser transmitter are provided at a front end outside the absorbing tank tube.A plurality of gas pipe joints are provided on the wall of the absorbing tank tube. According to the invention, a laser multi-reflecting and absorbing tank is used as a sampling and measuring gas chamber; the front cavity mirror and the rear cavity mirror are provided to form a multi-reflecting optical path, and accordingly, compared with an absorbing optical path of the in-situ detection, an absorbing optical path thereof is increased by several times, thereby being capable of improving the measuring precision. The laser multi-reflecting and absorbing tank is mounted in a heating cabinet boxpreprocessed at a high temperature, and the laser transmitter and the detector are placed outside the heating cabinet box and are connected with a monitor main body via an optical fiber and a cable. Real-time measurement can be performed on a high-temperature gas which enters the absorbing tank after being sampled and processed, and the measuring precision and reliability are improved.

The invention discloses a full-spectrum water quality online monitoring device. The device comprises a monitoring control host and a sensing probe electrically connected with the monitoring control host, the monitoring control host comprises a data display unit, a data output unit, a control unit, a data processing unit, a light source unit, a standard-added calibration unit and an analysis unit,the sensing probe comprises a probe body, an analysis chamber and a reflection unit, a beam splitter is arranged in the probe body, a transition position of the probe body and the analysis chamber isprovided with a plurality of photoscopes, a transition position of the analysis chamber and the reflection unit is provided with a plurality of arc reflectors, and a temperature sensor is arranged inthe analysis chamber. According to the device, a light source is externally arranged in the monitoring control host, a deuterium lamp is adopted, ultraviolet, visible and near-infrared broadband spectrums are generated, capacity control of the light source can be performed, and high-precision monitoring and analysis of multiple monitoring objects can be realized; and the arc reflectors are adoptedso that multiple times of reflection absorption of the spectrum in the analysis chamber can be realized, the absorption optical path is increased, and the analysis resolution of the device is improved.

The invention provides a high reflector screening method applied to an optical cavity structure. The method comprises the following steps: 1) selecting a suitable high reflector according to light absorption cross section features of atmospheric molecules with concentration to be tested, and making a high value end of a reflection curve of the high reflector be overlapped with a wavelength range where a central peak wavelength of an emission spectrum of a light source and a maximum light absorption cross section of the atmospheric molecules with concentration to be tested as much as possible;and 2) in the case that the above step 1) is satisfied, assuming that the reflectivity peak of the high reflector is located at a wavelength lambda max, the reflectivity peak is Rmax, and the light transmittance at the wavelength lambda max is T, when the high reflector is selected at last, maximizing the value of (the formula is described in the specification) to achieve the best sensitivity andsignal to noise ratio. The optical cavity structure of the high reflector screened out by the method can not only effectively and conveniently detect the concentration of the atmospheric molecules, but also can effectively detect the concentration of atmospheric molecules with ultra-low concentration.

The invention provides a gas-path structure applied to an atmospheric molecule detection system. The system comprises an optical cavity structure consisting of two high-reflective mirrors, wherein a gas inlet and a gas outlet are formed in the optical cavity structure. The gas-path structure comprises a three-way electromagnetic valve, a flow controller, a first electromagnetic valve, a mass flowcontroller, a second electromagnetic valve and a suction pump; the first port of the three-way electromagnetic valve is communicated with the gas inlet of the optical cavity structure, the second portof the three-way electromagnetic valve is communicated with the flow controller, and the flow controller is communicated with the first electromagnetic valve; the third port of the three-way electromagnetic valve is used for inputting external to-be-analyzed atmosphere; the gas outlet is communicated with the mass flow controller, the mass flow controller is communicated with the second electromagnetic valve, and the second electromagnetic valve is communicated with the suction pump; and a TP temperature pressure sensor is arranged between the gas outlet and the mass flow controller. The gas-path structure can be used for efficiently and conveniently detecting the concentration of atmospheric molecules (such as NO2, NO3) and extinction of atmospheric particles, has ultrahigh sensitivity,and can be used for effectively detecting the concentration of atmospheric molecules with ultralow concentration.