Device for optical control of production atmosphere

FIELD: physics, measurement.

SUBSTANCE: invention is related to metering equipment and may be used as facility for continuous measurement of gases and dust concentration. Device comprises source 1 of optical pulses radiation, multichannel analyser 2, fibre optic coupler 3, external detector 4, which comprises body 5 containing collimating lens 6 and bundle of optic fibres 8, which is connected on one side to optic fibre 7, and on the other side forms fibre optic header 9, which is installed in focal plane 10 of collimating lens 6, and also time discriminator 11. At that source 1 is arranged in the form of fast-acting semi-conductor lasers. Treatment of sent and received electric signals is done by controller 12. External detector 4 is installed in investigated volume of production atmosphere 13, which is limited by wall 14 (obstacle).

EFFECT: provision of possibility of optical control of atmosphere in volume of production room and increased validity of measurements with preservation of their accuracy.

1 dwg

 

The invention relates to measuring technique and can be used as a means of continuous measurement of the concentration of gases and dust.

Known fiber optic sensor of the concentration of gases containing a source of optical radiation, the first optic fiber cell for the studied environment, the device receiving and processing the information signal, the frequency Converter of optical radiation, located between the first optic fiber and a cuvette for the studied environment, the receiver of optical radiation from the output of this cell and the transmission device information signal, an input connected to the output of the receiver of optical radiation (see RF patent for the invention №2265826 with priority dated 16.02.2004,, IPC 7 G01N 21/17, published 10.12.2005, "Fiber-optic sensor gas concentration").

A disadvantage of the known fiber-optic sensor is the impossibility of measuring a gas concentration in a large volume production premises, as the measurements are made only in the volume of the cell for a learning environment that does not allow you to control the state of the atmosphere in the entire volume of production facilities and the possibility of inaccurate measurements.

The closest to the essential features of the claimed invention are the two which is the device for optical control of the mine atmosphere, including a source of optical radiation pulses in the form of a pulse generator and a semiconductor light-emitting diode, a fiber optic coupler and an optical fiber connected to the fiber optic splitter, made in the form of optical connector, with splitter, remote sensor, comprising a housing and placed in it collimating lens, coupled with the other end of the optical fiber and the spectrum analyzer in the form of a photodetector with an interference filter, a signal amplifier and discriminator, and a controller for processing the transmitted and received electrical signals (see the journal "radio" No. 5, 2001, p.24-25, a publishing enterprise edition of the magazine "radio", Moscow).

A disadvantage of the known device for optical control of the mine atmosphere is the impossibility of measuring a gas concentration in a large volume production premises, as the measurements are made only in the volume of the remote sensor, which does not allow to control the state of the atmosphere in the entire volume of production facilities and the possibility of inaccurate measurements.

The technical result of the invention is to provide opportunities for optical control of the atmosphere in the volume of production facilities and increase the reliability of the measure which, while preserving their accuracy.

This technical result is achieved in that the device for optical control of the production of an atmosphere, comprising a source of optical radiation pulses, spectrum analyzer, fiber optic splitter, remote sensor, comprising a housing and located in the housing collimating lens, optical fiber, is connected to one side of the fiber optic splitter, and on the other hand - with a remote sensor, and a controller for processing the transmitted and received electrical signals, according to the invention further comprises a time discriminator, a source of optical radiation pulses is made in the form of high-speed semiconductor lasers and remote sensor further comprises posted in his case the bundle of optical fibers forming a one side of the fiber optic collector located in the focal plane of the collimating lens, and on the other hand connected with optical fiber, while the pulses radiated in the investigational volume and partially returning to the external sensor, sequentially pass through collimating lens, an optical collector, the bundle of optical fibers, optical fiber through a fiber optic splitter fall into the spectrum analyzer and the time discriminator.

The bundle of optical fibers, the size of the seal in the housing of the remote sensor, forming on one side of the fiber optic collector located in the focal plane of the collimating lens, and on the other hand connected with optical fiber, which allows the propagation of pulses of radiation in the direction of the control area and reception of reflected pulses, as well as the required signal/noise ratio by reducing the impact of phase and amplitude noise than is achieved technical result - enabling optical control of the atmosphere in the volume of industrial premises with linear dimensions in the range from 0.5 to 100 meters while maintaining measurement accuracy amplitude of the reflected pulses by reducing the impact of phase and amplitude noise. The source of optical radiation pulses, performed in the form of high-speed semiconductor lasers, allows measurements of short pulses, providing the required measuring range and an acceptable average radiation power. The time discriminator allows to determine the time delay of the reflected pulse and, thereby, to determine the size of the control area, resulting in the technical result is to increase the reliability of the measurements. The necessary accuracy of the measurement of the time delay of the pulses is maintained by use of the digital bundle of the optical fibers by reducing the impact of phase and amplitude noise.

Technical solutions, which coincides with the set of essential features of the claimed invention, is not revealed, which allows to make a conclusion on the compliance of the claimed invention to such a condition of patentability as "novelty". Declare the essential features that determine the receipt of the indicated technical result that is explicitly not follow from the prior art, which allows to make a conclusion on the compliance of the claimed invention to such a condition of patentability as "inventive step". The condition of patentability "industrial applicability" is confirmed on the example of a specific implementation of the inventive transponder devices optical atmospheric communication lines.

The claimed invention is illustrated in the drawing, which schematically shows the device for optical control of the production environment.

The optical device to control industrial atmosphere includes a source of optical radiation pulses 1, spectrum analyzer 2, the fiber optic splitter 3 remote sensor 4, comprising a housing 5 and located in the housing 5 of the collimating lens 6, the optical fiber 7 is connected to one side of the fiber optic splitter 3, and on the other hand - with a remote sensor 4. Remote sensor 4 further comprises housed in a casing 5 beam opt the ical fibers 8, connected to one side of the optical fiber 7, and on the other hand forming a fiber optic collector 9, located in the focal plane 10 of the collimating lens 6, and the source of optical radiation pulses 1 made in the form of high-speed semiconductor lasers and the optical device to control industrial atmosphere further comprises a time discriminator 11. Processing the transmitted and received electrical signals is performed by the controller 12. Remote sensor 4 placed in the studied production atmosphere 13 bounded by a wall 14 (obstacle).

The optical device to control industrial atmosphere works as follows. The source of optical radiation pulses 1 generates pulses of the probing radiation in the ranges of wavelengths corresponding to the absorption bands of controlled gas impurities. The radiation pulses have nanosecond duration. The pulses of radiation from the source 1 propagates through fiber optic splitter 3 and the optical fiber 7 in the direction of the remote sensor 4, pass the beam of optical fibers 8 and emitted from the optical fiber manifold 9 and the collimating lens 6 in the studied production atmosphere 13. While the fraction of energy reflected from the end face wholesale the fiber collector 9 in the opposite direction to the direction of the spectrum analyzer 2 and time discriminator 11. The pulses radiated in the analyzed volume production atmosphere 13, are to reflect the barriers 14 and partially returned to the external sensor 4, and then are sequentially collimating lens 6, an optical collector 9, the bundle of optical fibers 8 and propagated on the optical fiber 7 and through fiber optic splitter 3 fall into the spectrum analyzer 2 and the time discriminator 11. For analysis of signals perform temporal and amplitude selection pulses. As a reference selects the first pulse reflection from the end face of the fiber optic collector 9 remote sensor 4 by the known propagation time of the pulse in the optical fiber 7 and the expected amplitude. A second pulse reflections from obstacles 14 in the studied production atmosphere 13 allocate according to preliminary calibration and analyze the amplitude and time shift relative to the reference. Time shift gives information about the distance from the end face of the fiber optic collector 9 to reflect the barriers 14, which is calculated by the formula: L=C*(t2-t1)/2, where L is the distance from the end face of the fiber optic collector 9 to reflect the barriers 14, C is the speed of light in the atmosphere, t1 is the arrival time of the reference pulse, t2 is the arrival time of the reflection from the obstacle 14. The distance L is judged on the investigational volume is IU the production of the atmosphere 13. The ratio of amplitudes of the first and second pulses of radiation at the wavelength of absorption compared with the same ratio of pulses at a wavelength bandwidth gives information about the impurity concentration of the measuring gas in the studied production atmosphere 13.

The device for optical control of the production of an atmosphere, comprising a source of optical radiation pulses, spectrum analyzer, fiber optic splitter, remote sensor, comprising a housing and located in the housing collimating lens, optical fiber, is connected to one side of the fiber optic splitter, and on the other hand - with a remote sensor, and a controller for processing the transmitted and received electrical signals, characterized in that the device further comprises a time discriminator, a source of optical radiation pulses is made in the form of high-speed semiconductor lasers and remote sensor further comprises posted in his case the bundle of optical fibers, forming one side of the fiber optic collector located in the focal plane of the collimating lens, and on the other hand connected with optical fiber, while the pulses radiated in the investigational volume and partially returning to the external sensor, sequentially pass to luminouse lens, fiber optic collector, a bundle of optical fibers, optical fiber through a fiber optic splitter fall into the spectrum analyzer and the time discriminator.



 

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