| 基于任意相移量的4步相移数字全息新方法 |
| |
| 引用本文： | 余清婷.基于任意相移量的4步相移数字全息新方法[J].激光技术,2009,33(4):409-412. |
| |
| 作者姓名： | 余清婷 |
| |
| 作者单位： | 1.华南师范大学, 信息光电子科技学院, 广州, 510006 |
| |
| 摘 要： | 为了研究相移数字全息中的相移量计算问题,从菲涅耳衍射和全息理论出发,对相移离轴无透镜傅里叶变换数字全息的记录和再现进行了分析,推导了基于任意相移量的4步相移数字全息图的光场表达式,提出了一种利用相位相减计算任意相移量的新方法,并进行了相应的实验验证,得到了预期效果。结果表明,该方法与传统的4步相移方法相比,不需要对相移器进行严格标定,也能有效地消除数字全息再现光场中的0级衍射和共轭像,提高再现像的信噪比,因此,这对降低测量系统的复杂性,促进4步相移数字全息的发展是有帮助的。
|
| 关 键 词： | 全息 数字全息 相位相减 相移技术 傅里叶变换 |
| 收稿时间： | 2008-06-03 |
| 修稿时间： | 2008-09-24 |
A new method of four-step phase-shifting digital hologram based on arbitrary phase shifts |
| |
| Abstract: | In order to study the problem of calculating phase shifts in the phase-shifting digital holography, the principle of recording and reconstructing of phase-shifting off-axis lenless Fourier transform digital holography which is based on the Fresnel diffraction and holographic theory is analyzed. Then the complex field expression of four-step phase-shifting digital hologram based on arbitrary phase shifts is deduced. A new method of calculating arbitrary phase shifts by using phase subtracting is proposed. The experimental results show that compared with the conventional method of four-step phase-shifting, it is not necessary to calibrate phase-shifting devices strictly by using this method. The zero-order diffraction and the conjugate image are also elimilated effectively and the ratio of signal to noise is similarly improved. Therefore, the method contributes to reduce the complicacy of the measure system and promote the development of four-step phase-shifting digital hologram. |
| |
| Keywords: | Holography Digital holography Phase subtracting Phase-shifting technology Fourier transform |
|
| 点击此处可从《激光技术》浏览原始摘要信息 |
|
点击此处可从《激光技术》下载全文 |
|
