Noise and specific detectivity of pyroelectric detectors using lead titanate zirconate (PZT) thin films
✍ Scribed by Weiguo Liu; Ling Ling Sun; Weiguang Zhu; Ooi Kiang Tan
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 125 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0167-9317
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✦ Synopsis
Pyroelectric infrared detectors using sol-gel deposited lead zirconate titanate (PZT) thin films were fabricated. It was found that specific detectivity D* of the detector is a strong function of the modulation frequency of the incident radiation. Noise plays an important role at low frequencies ( , 20 Hz). When the modulation frequency is low ( , 10 Hz), the noise is dominated by 1 /f noise. Johnson noise dominates the noise at frequencies higher than 10 Hz. This characteristic can be clearly seen from the noise-frequency spectrum. A one-dimensional heat conduction theoretical model was used to simulate the dynamic responses of the pyroelectric IR detector. The simulated results fitted quite well with the experimental results. D* of the detector was predicted with the assumption that the Johnson noise was the dominating noise source.