Testing and calibration of an ultraviolet-A radiation sensor based on GaN photodiode

J. Theyirakumar, Geri Kibe Gopir, Baharudin Yatim, Hilmi Sanusi, P. S. Megat Mahmud, T. C. Hoe

Research output: Contribution to journalArticle

Abstract

An ultraviolet A (UVA) radiation intensity sensor with responsivity in the wavelength range of 320-360 nm was developed based on a gallium nitride (GaN) photodiode. In this sensor system, a GaNphotodiode in reverse-biased mode converts the radiation intensity into current, which was then converted and amplified into an output voltage by a transimpedance amplifier (TIA), or current-voltage converter, consisting of an operational amplifier and a feedback resistor. For a narrowband UV source, the radiation intensity could be calculated from the values of the output voltage, feedback resistor, photodiode responsivity and photodiode effective area. The sensor was tested by performing measurements over different values of UV source wavelength, source distance, ambient temperature and sampling time. For calibration with a broadband UV source, the GaN-UVA sensor was used simultaneously with a standard Si-UVA sensor to measure solar radiation. The observed linear relationship between the sensors' outputs enables us to convert the output voltage of the GaN-UVA sensor to UVA intensity. Thus, we have successfully developed, tested and calibrated an ultraviolet A radiation sensor based on the GaNphotodiode.

Original languageEnglish
Pages (from-to)21-25
Number of pages5
JournalSains Malaysiana
Volume40
Issue number1
Publication statusPublished - Jan 2011

Fingerprint

gallium nitrides
photodiodes
sensors
radiation
radiant flux density
output
electric potential
resistors
operational amplifiers
solar radiation
wavelengths
ambient temperature
converters
narrowband
amplifiers
sampling
broadband

Keywords

  • GaN photodiode
  • Radiation sensor
  • Transimpedance amplifier
  • Ultraviolet a

ASJC Scopus subject areas

  • General

Cite this

Theyirakumar, J., Gopir, G. K., Yatim, B., Sanusi, H., Megat Mahmud, P. S., & Hoe, T. C. (2011). Testing and calibration of an ultraviolet-A radiation sensor based on GaN photodiode. Sains Malaysiana, 40(1), 21-25.

Testing and calibration of an ultraviolet-A radiation sensor based on GaN photodiode. / Theyirakumar, J.; Gopir, Geri Kibe; Yatim, Baharudin; Sanusi, Hilmi; Megat Mahmud, P. S.; Hoe, T. C.

In: Sains Malaysiana, Vol. 40, No. 1, 01.2011, p. 21-25.

Research output: Contribution to journalArticle

Theyirakumar, J, Gopir, GK, Yatim, B, Sanusi, H, Megat Mahmud, PS & Hoe, TC 2011, 'Testing and calibration of an ultraviolet-A radiation sensor based on GaN photodiode', Sains Malaysiana, vol. 40, no. 1, pp. 21-25.
Theyirakumar J, Gopir GK, Yatim B, Sanusi H, Megat Mahmud PS, Hoe TC. Testing and calibration of an ultraviolet-A radiation sensor based on GaN photodiode. Sains Malaysiana. 2011 Jan;40(1):21-25.
Theyirakumar, J. ; Gopir, Geri Kibe ; Yatim, Baharudin ; Sanusi, Hilmi ; Megat Mahmud, P. S. ; Hoe, T. C. / Testing and calibration of an ultraviolet-A radiation sensor based on GaN photodiode. In: Sains Malaysiana. 2011 ; Vol. 40, No. 1. pp. 21-25.
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