Moisture detector, biological body moisture detector, natural product moisture detector, and product/material moisture detector
US7999231B2 · kind B2 · utility
7Cited by
1References
15Claims
0Family size
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Key dates
| Filing date | Jul 23, 2009 |
| Grant date | Aug 16, 2011 |
| Priority date | — |
| Expiry date | Apr 8, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E10/544
- WIPO fieldMicro-structural and nano-technology
- WIPO sectorChemistry
Abstract
A moisture detector includes a light-receiving element including an absorption layer having a pn-junction, or an array of the light-receiving elements, wherein the absorption layer has a multiquantum well structure composed of a Group III-V semiconductor, the pn-junction is formed by selectively diffusing an impurity element into the absorption layer, and the concentration of the impurity in the absorption layer is 5×1016/cm3 or less. The moisture detector receives light having at least one wavelength included in an absorption band of water lying in a wavelength range of 3 μm or less, thereby detecting moisture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.