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

A turnable diode laser trace gas measurement device and method which use a high diffuse reflection square chamber to increase optical paths belong to the technical field of trace gas concentration measurement. The invention solves the problem that methods which increase gas absorption optical paths in a limited space are complex in structure and high in cost. The device comprises a diode laser and a high diffuse reflection square chamber. The device further comprises a photomultiplier tube, a sawtooth wave signal generator, a sine wave signal generator, a mixer, a temperature controller, a current controller, a data collection card, a computer, a high voltage power supply, a wedge incident quartz lens and a wedge exit quartz lens. The method demodulates an electrical signal output by the photomultiplier tube into a second harmonic signal in the computer to obtain an optical parameter OP of the concentration of a to-be-measured gas, and then compares the OP to a standard curve of a to-be-measured gas optical parameter changing with the concentration of a gas in a high diffuse reflection square chamber, to obtain the concentration of the to-be-measured gas and to achieve measurement of the content of the to-be-measured gas. The device and the method are used for trace gas measurement.

The invention discloses an ultraviolet spectrophotometer, detecting head, and relates to an ultraviolet spectrophotometer. The invention provides a small portable ultraviolet spectrophotometer detecting head which not only has the advantages of small volume, high sensitivity and corrosion resistance, but also can be separated from an instrument host computer and used as soon as being connected, and meet the requirement on real-time detection of fields and sites. The ultraviolet spectrophotometer detecting head is provided with an incident optical fiber, an incident optical fiber connector, a return optical fiber connector, an incident optical fiber collimator, a return optical fiber collimator, a return optical fiber, an upper shell, a lower shell, conical surface reflection prisms and a sample pool, wherein an output end of the incident optical fiber is connected with an input end of the incident optical fiber connector; an output end of the incident optical fiber connector is connected with the incident optical fiber collimator; output light of the incident optical fiber collimator enters the return optical fiber collimator after being reflected by more than one odd number of theconical surface reflection prisms arranged in the sample pool; an output end of the return optical fiber collimator is connected with an input end of the return optical fiber connector; an input endof the return optical fiber connector is connected with the input end of the return optical fiber; and the sample pool is arranged in a cavity between the upper shell and the lower shell.

The invention discloses a trace gas detection device and a trace gas detection method based on an intermediate infrared quantum cascade laser direct absorption spectrum method. A tunable quantum cascade laser serves as a light source, and concentration information of gas molecules to be measured is acquired by utilizing fundamental frequency fingerprint absorption characteristics of the gas molecules in an intermediate infrared wave band; the measured result is slightly influenced by light-intensity variation of the laser and has higher signal to noise ratio and certain anti-jamming capability by utilizing a direct absorption spectrum technology; and whether the measured gas contain expected gas components can be analyzed and determined by contrasting the measured spectrum with spectral line characteristics of corresponding gas in a HITRAN database, and concentration inversion is performed by utilizing spectral line parameters provided by the HITRAN database. The system is simple and compact in structure and convenient to use and maintain, has the characteristics of high measuring sensitivity, high accuracy and high response speed, can rapidly and accurately analyze and detect a plurality of trace gases and isotope ratios on line, and can be used for indicating and rapidly and accurately positioning intermediate infrared light spots.

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 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 discloses a multiple-reflection flame atomizer. The multiple-reflection flame atomizer comprises a multiple-reflection absorbing area and an external light path. The multiple-reflection flame atomizer disclosed by the invention has the advantages that the effect of repeatedly penetrating flame is achieved by controlling measuring beams; by collimation of the external light path, the structure of a monochromator is simplified, the limitation of an incident diaphragm is eliminated and the luminous flux is increased; under the premise of not changing the size and the state of the flame, the effective optical path is increased and the detection sensitivity of an instrument is improved.