A device for determining the relative concentration of ortho and para water isomers

摘要

The technical result is achieved in that a device for determining the relative concentration of molecules of ortho- and para.; 1. An apparatus for determining the relative concentrations of the ortho and para molecules comprising a system basic input parameters, the parameters of the selection system, a tunable diode laser, a control system, thermal stabilization system, pump system, and spectral and power control parameters emission tunable diode laser system for generating spatial characteristics the laser beam, the spectral analysis of an object, comprising the pair of ortho and para, located in an open atmosphere or in a sealed volume e, devices equipped with input and output radiation and lapping the analyzed medium, the laser detection system preamplification system detected RF signal, digitizing system, the read, accumulation, and preservation of the recorded signal transmission spectra laser processing system, a system for calculating the relative content of molecular ortho- and para water in the analyzed medium, the resultant data output system, the basic input parameters of the system interfaced with the control system, otorrhea is configured to transmit information on the thermal stabilization system, to the pump and control system spectral and power parameters of the radiation of a tunable diode laser, which is associated with a tunable diode laser, as well as digitizing system, reading, accumulating and saving the recorded signal and the processing system laser transmission spectra , parameter selection system is interfaced with the control system, a tunable diode laser, in turn, is associated with the conditioning system and with a system of spatial characteristics of the laser beam, which are connected in series object spectral analysis system laser detection, preamplification system detected RF signal, digitizing system, reading, storage and preservation of the recorded signal, the system processing laser transmission spectra, the system for calculating the relative content ortho- and para water molecules in the analyzed medium, the resultant data output system, the system calculation of the relative content of ortho- and para molecules in the assay medium is arranged to transmit information on the thermal stabilization system, the pump system and to control the spectral parameters and power tunable diode laser radiation on the digitizing system, reading, storage and preservation of the recorded signal, laser processing system transmittance spectra, adapted to determine the relative concentration of molecules of ortho- and para using overlapping absorption bands of the molecules of ortho- and para, with the possibility of selecting a pair of closely spaced absorption lines, one of which belongs ortovody molecule, and the second - para water molecule, to determine, by comparison of the resonant absorption in two lines, the relative content of ortho- and para molecules in spectral analysis examined object, with the possibility of spectral range, wherein there is one of the absorption bands of water vapor, which is a compound or overtone vibration of the fundamental bands f absorption H ₂ O, to reduce a temperature dependence of the measurement results of the relative content of ortho- and para molecules by selection of absorption lines with close lower energy levels, capable of improving measurement accuracy by narrowing the dynamic range of measurements using molecular absorption line ortho- and para water with similar intensity, using the detected transmission spectra of the medium under investigation for the calculation of the spectrum of the absorption coefficient in the lines, with the opportunities of Strongly accounting laser intensity is analytical absorption lines, to determine from the absorption intensity, using the width data, shape of the absorption lines, the optical path length and the temperature, concentrations of these molecules and their relative contents, with the possibility of increasing the detection sensitivity of the method the relative concentration of molecules of ortho- and para registration and use of the first and / or second derivative molecules transmission spectra of the ortho and para, and with Using differential amplification detected by a photodetector RF signal or an additional high pass filter tuned to the desired radio frequency range, allowing to obtain at the output of preamplification detected RF signal analog signal corresponding to the first or second derivative of the transmission spectrum, with the possibility of use for analysis of the relative content ortho and para molecules in water vapor absorption lines belonging comp avnoy vibrational-rotational band ν ₁ + ν _3, and located near 1.359 micron, with the possibility of use for analysis of water-vapor absorption line of molecular isomer frequency 7354,599 cm ^-1 and for the analysis of molecules ortho-water - the absorption line at the frequency 7355,557 cm ^-1, with recording of the transmission spectrum of ortho- and para molecules using a tunable diode laser based compound GaInAsP, operating in a specified spectral range to the optical frequency of the laser to be scanned in the analytical spectral range, with leaves 3 cm ^-1, due to the pump laser current pulses periodically repeating amplitude of about 100 mA, duration of ~ 3 ms and a repetition frequency of ~ 120Hz., while passing the laser radiation through an optical cell containing water vapor, a length of 20 cm and a diameter of 4 cm, to detect transmitted through the medium to be analyzed with the use of laser radiation based on InGaAs photodiode compound, with laser you log spectrum transmission medium containing molecules under study absorption line ortho- and para.