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Optical power self-adaptive adjusting method and device for terahertz time-domain spectroscopy system

A terahertz time-domain, self-adaptive adjustment technology, applied in the field of terahertz spectroscopy and imaging, can solve the problems of complex MVOA debugging, high cost of EVOA, and inability to automatically adjust, achieving the effect of simple debugging, low cost, and good linearity

Pending Publication Date: 2021-11-19
青岛青源峰达太赫兹科技有限公司
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  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of complex debugging, slow response speed, and difficult locking after adjustment of the current MVOA, as well as the high cost of the existing EVOA, which cannot be automatically adjusted, the present invention discloses an optical power automatic To adapt to the adjustment method and device, the main control MCU realizes the precise control of the EVOA attenuation value through the adjustment of the pulse duty cycle, and then realizes the adaptive adjustment of optical power

Method used

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  • Optical power self-adaptive adjusting method and device for terahertz time-domain spectroscopy system
  • Optical power self-adaptive adjusting method and device for terahertz time-domain spectroscopy system
  • Optical power self-adaptive adjusting method and device for terahertz time-domain spectroscopy system

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Embodiment 1

[0031] like figure 1 As shown, this embodiment involves an optical power adaptive adjustment device for a terahertz time-domain spectroscopy system, including a femtosecond laser 1, a transmission electronically controlled adjustable attenuator 2, a detection electronically controlled adjustable attenuator 3, Emitting optical splitter 4, detecting optical splitter 5, electronically controlled adjustable attenuator power control unit 6, photodiode 7, converter module 8, A / D module 9, main control MCU 10 and upper computer PC 11.

[0032] The femtosecond laser 1 is used to emit two femtosecond pulses, one for pumping light and one for probing light. The emission electronically controlled adjustable attenuator 2 is used to receive pump light, and the emission optical splitter 4 is connected to the emission electronically controlled adjustable attenuator 2 for splitting the pump light into a first light beam and a second light beam. The detection electronically controlled adjusta...

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Abstract

The invention discloses an optical power self-adaptive adjusting device and method for a terahertz time-domain spectroscopy system, and the device comprises a femtosecond laser, an emission electric control adjustable attenuator, a detection electric control adjustable attenuator, an emission optical splitter, a detection optical splitter, an electric control adjustable attenuator power supply control unit, an optical power conversion and transmission module, a master control MCU and an upper computer PC. The master control MCU collects and analyzes an optical power signal sent by the optical power conversion and transmission module, compares the optical power signal with a corresponding transmitting end optical power threshold value or a detection end optical power threshold value, and outputs a corresponding pulse duty ratio signal to the electric control adjustable attenuator power supply control unit. The electric control adjustable attenuator power supply control unit outputs voltage to the emission electric control adjustable attenuator and the detection electric control adjustable attenuator based on the received pulse duty ratio signal. Through the synergistic effect of the main control MCU and the electric control adjustable attenuator power supply control unit, adaptive adjustment of the EVOA is realized, and the EVOA is easy to debug, high in response speed, high in control precision and low in cost.

Description

Technical field: [0001] The invention belongs to the technical field of terahertz spectroscopy and imaging, and in particular relates to an optical power adaptive adjustment method and device for a terahertz time-domain spectroscopy system. Background technique: [0002] Terahertz wave is an electromagnetic wave with strong penetrating ability and low photon energy between microwave and infrared bands. Its frequency is 0.1-10THz (1THz=10 12 Hz). Terahertz spectroscopy and imaging systems use terahertz waves for photoconductive sampling, and are widely used in material identification, safety inspection, non-destructive testing of materials and structures, biopsy of biological tissues, wireless communications and other fields. [0003] In sampling, the laser generated by the femtosecond laser excites the photoconductive antenna to generate photogenerated carriers, and these carriers form a current under the action of the terahertz pulse electric field, and the measurement of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3586G01J3/28G01J3/02
Inventor 管玉超朱新勇张朝惠刘永利郭永玲初文怡秦政飞
Owner 青岛青源峰达太赫兹科技有限公司
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