Instrumentation Of FPcA-I Terahertz Time-Domain Spectroscopy System

As an electromagnetic wave with wavelength between infrared and microwave, terahertz wave has characters with both electromagnetism and light electronics, which exists widely in nature. The terahertz time-domain spectrum technique is a kind of coherent detection of electromagnetic radiation. By using femtosecond pulse laser pumped to produce and detection terahertz radiation it can gain terahertz pulse amplitude and phase information. The time domain terahertz spectrum technology can be applied with a wide range of samples according the spectrum characteristics of detection. Developing and manufacturing terahertz spectral instrument with independent intellectual property rights is of great significance, so we work to make the terahertz spectral instruments practical, miniaturized and high performance, and the main content includes the following 5 aspects.1. Using optical fiber laser of small size pumped to produce femtosecond laser pulses; Setting up compact fiber photoconduction THz-TDS system; Using CD552-R3 circuit in data collection and cy7c68013 USB module in data communication.2. A spectrometer shell of hierarchical structure is designed to make the system antiquating and sealed. The shell is made of light engineering plastic- ABS, which makes the whole system of small size, light weight, and convenient to move.3. A continuous detector for testing tablet samples and a device for detecting liquid samples are made for users in detecting various forms of samples conveniently. By designing a stepping motor controller, make samples of 2-d scanning automatically.4. In odder to decrease the possible misregistration caused by the delay line tilt, we use the results of Fourier infrared spectrometer-- VERTEX 80 as standard baseline, to calibrate terahertz spectrum, and have obtained good effect.5. After the instrument's assembling, we complete evaluating and preliminary testing of the overall instrument, and the results show that the overall instrument can be used to detect samples, with the operation comfortably and man-machine environment friendly.