variable gain amplifiers
Recently Published Documents


TOTAL DOCUMENTS

39
(FIVE YEARS 4)

H-INDEX

8
(FIVE YEARS 0)

2021 ◽  
Vol 6 (2) ◽  
pp. 39-46
Author(s):  
Bao My Nguyen Thi ◽  
Van Sy Nguyen ◽  
Van Tien Vu ◽  
Quang Tuan Ho ◽  
Thuy Mai Nguyen Thi ◽  
...  

X-ray measurement equipment is designed which utilizes a pair of photodiode detectors. The equipment is designed which utilizes a pair of photodiode detectors units which receive X-rays through filters with different attenuation coefficients for X-rays. The photodiode detector units preferably includes two pairs of photodiode detectors arranged symmetrically in four quadrants with the diodes in each detector unit in diagonally opposite quadrants. The outputs of the detector units are passed to variable gain amplifiers, gains of which are adjusted to bring the output voltages within a desired range, and the outputs of the amplifiers are integrated by integrators. After a selected period of time, the integration is stopped and the output voltages of the integrators are held and transmitted to an analog-to-digital converter. The ratio of the two output signals from a pair of photodiode detectors represents the kVp value of the X-ray machine and another pair of photodiode detectors used to measure the relative current in milliamps (mA) and exposure time of the x-ray unit.In this study,  the equipment have been made for measuring the characteristics of X-Ray with an accuracy of kVp (kV), I (mA) is 5% and the 2% T.


IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Lingshan Kong ◽  
Yong Chen ◽  
Haohong Yu ◽  
Chirn Chye Boon ◽  
Pui-In Mak ◽  
...  

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 197276-197286
Author(s):  
Jiri Petrzela ◽  
Roman Sotner

2018 ◽  
Vol 36 (5) ◽  
pp. 484-500
Author(s):  
Chunfeng Bai ◽  
Jianhui Wu ◽  
Xiaoying Deng

2014 ◽  
Vol 43 (7) ◽  
pp. 459-461
Author(s):  
E. O. Belousov ◽  
A. G. Timoshenko

Sign in / Sign up

Export Citation Format

Share Document