US 11,852,582 B2
Automatic photocurrent spectrum measurement system based on fourier infrared spectrometer
Liangqing Zhu, Shanghai (CN); Junli Wang, Shanghai (CN); Liyan Shang, Shanghai (CN); Le Wang, Shanghai (CN); and Zhigao Hu, Shanghai (CN)
Assigned to East China Normal University, Shanghai (CN)
Filed by East China Normal University, Shanghai (CN)
Filed on Aug. 2, 2022, as Appl. No. 17/879,665.
Claims priority of application No. 202110929415.7 (CN), filed on Aug. 13, 2021.
Prior Publication US 2022/0381683 A1, Dec. 1, 2022
Int. Cl. G01N 21/35 (2014.01); G01N 21/3563 (2014.01); G01N 21/01 (2006.01)
CPC G01N 21/3563 (2013.01) [G01N 21/01 (2013.01); G01N 2021/3595 (2013.01); G01N 2201/023 (2013.01)] 8 Claims
OG exemplary drawing
 
1. An automatic photocurrent spectrum measurement system based on a Fourier infrared spectrometer, comprising:
a light source component;
an environment control component;
a measurement module; and
a control module;
wherein the light source component comprises an infrared light source and the Fourier infrared spectrometer; the Fourier infrared spectrometer comprises an interferometer, a test chamber and a data conversion module;
the infrared light source is configured to provide 1-100 μm infrared band light; and the interferometer is configured to convert the infrared band light into interference light;
the environment control component comprises a temperature control device and a vacuum system; the temperature control device comprises a temperature control table and a cold head; the cold head is provided with an electrode with a wire leading to an outside; the temperature control device is configured to provide a sample test temperature; the vacuum system is configured to provide vacuum conditions for the test chamber and sample environment;
the measurement module is configured to apply bias voltage and bias current to the electrode; according to measurement requirements, the measurement module is configured to transmit a collected signal to the control module or the Fourier infrared spectrometer; and the data conversion module is configured to perform Fourier transform on a photocurrent interference signal of the collected signal to generate a frequency domain signal, and transmit the frequency domain signal into the control module;
the control module is configured to send an test instruction to individual components and modules according to measurement requirements; the light source component is configured to control switching of the infrared light source and adjust scanning range and resolution of Fourier infrared spectrometer after receiving the test instruction; the measurement module is configured to change a range of the bias voltage or bias current, and scanning step, collect an electrical signal generated by sample response and transmit the electrical signal to the control module and the light source component after receiving the test instruction; and the environment control component is configured to set the sample test temperature point and a vacuum environment in the test chamber.