CN100399212C - 全息底片过曝光的挽救方法 - Google Patents

全息底片过曝光的挽救方法 Download PDF

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CN100399212C
CN100399212C CNB2004100663928A CN200410066392A CN100399212C CN 100399212 C CN100399212 C CN 100399212C CN B2004100663928 A CNB2004100663928 A CN B2004100663928A CN 200410066392 A CN200410066392 A CN 200410066392A CN 100399212 C CN100399212 C CN 100399212C
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hologram
overexposure
egative film
negative
regeneration
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CN1588239A (zh
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陈建文
高鸿奕
徐至展
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Abstract

一种全息底片过曝光的挽救方法,该方法包括以下四个步骤:在暗室中,将含有全息图的过曝光底片的乳剂面和一未感光的底片非乳剂面重叠,并压在两块干净的玻璃板之间;将上述重叠的底片用不同的曝光时间曝光,通常是1秒钟至5秒钟,曝光5张底片形成再生的全息底片;将上述再生的全息图底片显影、定影后晾干;从再生全息图中选择出一张曝光量合适的底片,进行光学重构或数字重构,可以获得较清晰的全息图重构像。

Description

全息底片过曝光的挽救方法
技术领域
本发明涉及全息,特别是一种全息底片过曝光的挽救方法。
背景技术
自从激光出现以后,为全息提供了一个理想的相干光源,全息术获得迅猛的发展。如今全息术已经进入到人们的日常生活,在超级市场上,各种各样的商品到处粘贴着五光十色的用全息方法制造的防伪标志,一切的一切都是为了帮助人们提高生活质量。
全息术本身的发展沿着两个不同的方向在进行的,一、为了提高全息术的成像分辨率,采用短波长、紫外、软X射线、硬X射线、电子束、原子束以及中子,分辨率已达到或者小于原子量级。二、为了研究瞬态现象,向超快方向发展,从微秒、纳秒、皮秒直达飞秒,特别是飞秒全息。飞秒全息成像技术作为研究超快现象的基本手段之一,具有重要的科学研究和应用价值。
无论是长波长全息,还是短波长全息,或者是超快脉冲全息,目前记录方式大致有两种:底片记录和CCD探测。
以CCD电荷耦合器作为探测器来记录全息图,并进行A/D板转换成数字,存储到计算机中,并用数字傅里叶变换取代光学衍射来完成全息图重构。由于数字全息术采用CCD记录代替了早期全息术中需要干板记录,避免了暗房中那些操作过程,并能获得实时重构,形成数字全息,数字全息近年来获得了快速的发展。令人感到不足的是电荷耦合器CCD的分辨率不高,它能分辨的最小单元大约为20μm左右,因此用CCD作为光学全息的记录介质时,物束和参考束之间的夹角往往限制在1~2度范围之内,不仅分辨率不高,而且全息图的视场角也很小,大大地限制了全息的广泛应用。
在实际工作中,例如用He-Ne激光器记录一张在可见光波段的全息图,或者是采用电子显微镜记录一张电子全息图。现在还是普遍采用干板,但采用干板记录全息图时,往往曝光量难以控制。特别是在科学研究中,一个重要的现象不能即时记录,就有可能失去一次重大发现的良机。
发明内容
本发明针对上述在先技术中存在的缺点,提供一种全息底片过曝光的挽救方法,这种方法应简单有效。
本发明的技术解决放案如下:
一种全息底片过曝光的挽救方法,包括以下四个步骤:
1)在暗室中,将含有全息图的过曝光底片的乳剂面和一未感光的底片非乳剂面重叠,并压在两块干净的玻璃板之间;
2)将上述重叠的底片用不同的曝光时间曝光,选择1秒钟至5秒钟,曝光5张底片形成再生的全息底片;
3)将上述再生的全息图底片显影、定影后晾干;
4)从再生全息图中选择出一张曝光量合适的底片,进行光学重构或数字重构,就可以获得清晰的全息图重构像。
本发明的技术效果如下:
在实际工作中,采用干板在电子显微镜中记录一张电子全息图,曝光量难以控制,干板过曝光,不能进行光学重构,不能获得全息图重构像,将上述全息图进行拷贝,可以寻找到一张含有全息图的最佳曝光量的底片,再生的全息图进行光学重构或数字重构,就可以获得较清晰的全息图重构像。
具体实施方式:
下面结合实施例对本发明作说明。
本发明全息底片过曝光的挽救方法,其具体处理过程包括以下四个步骤:
1)在暗室中,将含有全息图的过曝光底片的乳剂面和一未感光的底片非乳剂面重叠,并压在两块干净的玻璃板之间;
2)将上述重叠的底片,根据过曝光底片的情况选择曝光时间2秒钟至3秒钟,进行5次曝光,形成再生的5张全息底片;
3)将上述再生的全息图底片显影、定影后晾干;
4)从再生全息图中选择出一张曝光量合适的底片,进行光学重构或数字重构,获得了清晰的全息图重构像。

Claims (1)

1.一种全息底片过曝光的挽救方法,其特征在于该方法包括以下四个步骤:
1)在暗室中,将含有全息图的过曝光底片的乳剂面和一未感光的底片非乳剂面重叠,并压在两块干净的玻璃板之间;
2)将上述重叠的底片用不同的曝光时间曝光,选择1秒钟至5秒钟,曝光5张底片形成再生的全息底片;
3)将上述再生的全息图底片显影、定影后晾干;
4)从再生全息图中选择出一张曝光量合适的底片,进行光学重构或数字重构,就可以获得清晰的全息图重构像。
CNB2004100663928A 2004-09-15 2004-09-15 全息底片过曝光的挽救方法 Expired - Fee Related CN100399212C (zh)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104519A (en) * 1976-10-20 1978-08-01 William Henry Oldendorf Method and apparatus for retrieval of exposure information from film images
US5016953A (en) * 1989-08-31 1991-05-21 Hughes Aircraft Company Reduction of noise in computer generated holograms
JPH11265037A (ja) * 1998-01-21 1999-09-28 Eastman Kodak Co ハロゲン化銀画像形成要素

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104519A (en) * 1976-10-20 1978-08-01 William Henry Oldendorf Method and apparatus for retrieval of exposure information from film images
US5016953A (en) * 1989-08-31 1991-05-21 Hughes Aircraft Company Reduction of noise in computer generated holograms
JPH11265037A (ja) * 1998-01-21 1999-09-28 Eastman Kodak Co ハロゲン化銀画像形成要素

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