The invention discloses an optical fiber calibration method for signal splicing based on a gas absorption cell. The method comprises the steps of: (1) irradiating multiple groups of tunable laser, andobtaining an absorption peak wavelength of a calibration signal at each group of bandwidths and a corresponding phase of the calibration signal in a beat frequency signal; (2) taking the phase corresponding to any overlapping absorption peak wavelength of the first group of signals to be spliced as a reference, keeping the interval of the phases corresponding to the absorption peak wavelengths ofthe second group of signals to be spliced unchanged, and translating the second group of signals to be spliced into two groups of signals to be spliced whose phases are equal at the overlapping absorption peak wavelength; (3) deleting excess phase values at all overlapping absorption peak wavelengths; (4) performing signal splicing in sequence according to the above method; and (5) after splicingis completed, fitting an absorption peak frequency-phase linear function to calculate the length of an optical fiber to be calibrated. The length of the optical fiber obtained through calibration according to the optical fiber calibration method disclosed by the invention can be traced to the NIST standard, and the bandwidth is scanned every time, the amount of collected data is small, and the collection and data processing time is shortened.

Optical fiber calibration method for signal splicing based on gas absorption cell

The invention relates to a method and a device for monitoring energy of a non-chain pulse chemical laser in real time, which realize the non-insertion energy monitoring of a high-power high-repetition-frequency non-chain chemical laser. The method mainly comprises the following steps: firstly, adjusting tunable narrow linewidth laser parameters according to characteristic spectral lines of gas molecules in a laser to be detected; secondly, splitting the tunable narrow linewidth laser beam into beams and respectively and simultaneously irradiating a gain area and a non-gain area of the laser tobe tested; and finally, respectively collecting the laser intensity passing through the gain region and the non-gain region of the laser to be detected to obtain absorption spectrum curves of the gain region and the non-gain region of the laser, and calculating to obtain the energy of each pulse in the process of the laser repeating frequency operation. The concentration of an activating substance (HF molecule) formed by a single pulse of the laser is measured by an optical non-contact method, and the pulse energy of the non-chain pulse chemical laser is obtained by calculation, so that otherlight splitting elements are prevented from being introduced into an output light path of the laser, and the real-time monitoring of the laser energy is realized while the output light path of the laser is simplified.

Method and device for monitoring energy of non-chain pulse chemical laser in real time

The invention relates to a method and device for measuring the gas concentration based on an automatic temperature compensation tunable diode laser absorption spectroscopy (TDLAS) technology. The method comprises the following steps that firstly, a standard probe and a measuring probe are arranged, the standard probe is filled with standard gas, the gas in the measuring probe is gas in a measuredgas source, and the standard probe and the measuring probe are placed in the measured gas source; secondly, tunable narrow linewidth laser parameters are adjusted according to a characteristic spectral line of measured gas molecules, and it is ensured that the scanning wavelength range of a tunable narrow linewidth laser only covers one characteristic spectral line of to-be-measured gas molecules;then, the tunable narrow linewidth laser is subjected to beam splitting and then simultaneously irradiates the gas in the standard probe and the gas in the measuring probe; and finally, the strengthof the laser passing through the standard probe and the measuring probe is collected, and the concentration of the measured gas is calculated. The strength of absorption lines at different temperatures does not need to calculated in a pre-fitting mode, the temperature of the measured gas does not need to be measured in real time, and the concentration of the measured gas at the different temperatures can be accurately measured.

Method and device for measuring gas concentration based on automatic temperature compensation tunable diode laser absorption spectroscopy (TDLAS) technology

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Method and device for monitoring energy of non-chain pulse chemical laser in real time

Method and device for measuring gas concentration based on automatic temperature compensation tunable diode laser absorption spectroscopy (TDLAS) technology