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<p>For the metrological support of the unit of mean power of laser radiation, the researchers often use standard and working measuring instruments based on thermal sensors (calorimeters). These instruments make it possible to reproduce the power unit of optical radiation with high accuracy and within a&#xa0;broad spectral range, as well as to perform routine measurements of the laser power. However, there exists a&#xa0;typical problem of measurements performed by using thermal sensors caused by the high inertia of thermal processes, which strongly increases the total time of measurements and is critical in numerous applications, e.g., in measuring the parameters of high-intensity radiation. By using, as an example, a&#xa0;PMT-25-50 thermal sensor (developed at the All-Russian Research Institute of Optical and Physical Measurements), we analyze various factors affecting the speed of thermal sensors. We describe a&#xa0;method for reducing the time constant of a&#xa0;thermal sensor by optimizing the design of thermoelements in its composition. However, it is not always reasonable to increase the speed of response by optimizing the design of thermal sensors. In order to get a&#xa0;fast asymptotic estimate of the measured power, we use mathematical methods for processing the signals of thermal sensors. The proposed methods were tested for PMT-25-50 and PMT-45-10K thermal sensors (developed at the All-Russian Research Institute of Optical and Physical Measurements), which are an integral part of the laser power measurement device. We present the results of investigation of the metrological characteristics of a&#xa0;PMT-25-50 sensor and its time characteristics prior to and after the application of the above-mentioned signal processing methods. The use of the proposed signal processing methods makes it possible to make the duration of measurements 3–4&#xa0;times smaller. The accumulated results are actual for the metrology of high-intensity laser radiation, e.g., for monitoring the parameters of radiation of industrial lasers and laser medical equipment.</p>

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Fast measurements of the power of laser radiation by laser power meters with thermal sensors. Application of the algorithms for extrapolating signals

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • S. B. Bychkov,
  • K. V. Zayats,
  • C. S. V. Tihomirov

摘要

For the metrological support of the unit of mean power of laser radiation, the researchers often use standard and working measuring instruments based on thermal sensors (calorimeters). These instruments make it possible to reproduce the power unit of optical radiation with high accuracy and within a broad spectral range, as well as to perform routine measurements of the laser power. However, there exists a typical problem of measurements performed by using thermal sensors caused by the high inertia of thermal processes, which strongly increases the total time of measurements and is critical in numerous applications, e.g., in measuring the parameters of high-intensity radiation. By using, as an example, a PMT-25-50 thermal sensor (developed at the All-Russian Research Institute of Optical and Physical Measurements), we analyze various factors affecting the speed of thermal sensors. We describe a method for reducing the time constant of a thermal sensor by optimizing the design of thermoelements in its composition. However, it is not always reasonable to increase the speed of response by optimizing the design of thermal sensors. In order to get a fast asymptotic estimate of the measured power, we use mathematical methods for processing the signals of thermal sensors. The proposed methods were tested for PMT-25-50 and PMT-45-10K thermal sensors (developed at the All-Russian Research Institute of Optical and Physical Measurements), which are an integral part of the laser power measurement device. We present the results of investigation of the metrological characteristics of a PMT-25-50 sensor and its time characteristics prior to and after the application of the above-mentioned signal processing methods. The use of the proposed signal processing methods makes it possible to make the duration of measurements 3–4 times smaller. The accumulated results are actual for the metrology of high-intensity laser radiation, e.g., for monitoring the parameters of radiation of industrial lasers and laser medical equipment.