JPH03251888A - Holographic camera - Google Patents
Holographic cameraInfo
- Publication number
- JPH03251888A JPH03251888A JP5069590A JP5069590A JPH03251888A JP H03251888 A JPH03251888 A JP H03251888A JP 5069590 A JP5069590 A JP 5069590A JP 5069590 A JP5069590 A JP 5069590A JP H03251888 A JPH03251888 A JP H03251888A
- Authority
- JP
- Japan
- Prior art keywords
- light
- scattered
- measuring object
- image
- real time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000001427 coherent effect Effects 0.000 claims abstract description 6
- 230000001678 irradiating effect Effects 0.000 claims abstract description 3
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000006185 dispersion Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 description 7
- 238000010191 image analysis Methods 0.000 description 5
- 238000001093 holography Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Abstract
Description
この発明は、物体の表面の微細な動きをリアルタイムで
非接触に測定することなどに好適な、ホログラフィカメ
ラに関する。The present invention relates to a holography camera suitable for measuring minute movements on the surface of an object in real time and in a non-contact manner.
従来より、物体にコヒーレントな照明光を照射し、その
散乱光と参照光とを感光記録板上で干渉させ、その干渉
縞を記録するホログラフィ装置が知られている。この感
光記録板としては、乾板もしくはホログラフィックプレ
ートなとの写真記録材料が用いられるのが普通である。BACKGROUND ART Conventionally, a holography apparatus has been known that irradiates an object with coherent illumination light, causes the scattered light of the illumination light to interfere with a reference light on a photosensitive recording plate, and records interference fringes. As this photosensitive recording plate, a photographic recording material such as a dry plate or a holographic plate is usually used.
しかしながら、従来のように写真記録材料からなる感光
記録板を用いるのでは、刻々変化する物体に応じて刻々
変化するホログラムのリアルタイムでのモニタリングか
できないという問題かある。
また、ホログラムの画像解析を行う場合に、写真画像の
読み取り等が必要となり、読み取り誤差が生じ、正確な
解析が困難であるという問題もある。
この発明は、物体が刻々変化する場合でもそのリアルタ
イムでのモニタリンクを可能とするとともに、読み取り
誤差等の問題を回避できる、ホログラフィカメラを提供
することを目的とする。However, if a photosensitive recording plate made of a photographic recording material is used as in the past, there is a problem in that it is only possible to monitor in real time a hologram that changes from moment to moment in response to an object that changes from moment to moment. Furthermore, when performing image analysis of a hologram, it is necessary to read a photographic image, which causes reading errors and makes accurate analysis difficult. An object of the present invention is to provide a holography camera that enables real-time monitoring of an object even when the object changes every moment, and can avoid problems such as reading errors.
上記の目的を達成するため、この発明によるホログラフ
ィカメラにおいては、コヒーレントな光を発生する手段
と、上記の光を２方向に分ける手段と、分けられた一方
の光を分散して測定対象物に照射する分散手段と、測定
対象物からの散乱光と上記の分けられた他方の光とが導
かれる２次元的な光電変換手段とが備えられる。In order to achieve the above object, the holographic camera according to the present invention includes a means for generating coherent light, a means for dividing the light into two directions, and a means for dispersing one of the divided lights and directing it to the object to be measured. It is provided with a dispersing means for irradiating and a two-dimensional photoelectric conversion means through which the scattered light from the object to be measured and the other separated light are guided.
測定対象物からの散乱光と、分けられた他方の光とが２
次元的な光電変換手段に導かれるので、その表面上で２
つの光の干渉が生じる。その干渉縞は測定対象物体の表
面状態に対応し、それが２次元的光電変換手段によって
、電気的な画像信号に変換されることになる。
そこで、測定対象物体の表面状態を表すホログラムであ
る干渉縞の画像信号がリアルタイムで得られることにな
る。The scattered light from the object to be measured and the other separated light are
Since it is guided by a dimensional photoelectric conversion means, 2
Interference of two lights occurs. The interference fringes correspond to the surface condition of the object to be measured, and are converted into electrical image signals by the two-dimensional photoelectric conversion means. Therefore, an image signal of interference fringes, which is a hologram representing the surface state of the object to be measured, can be obtained in real time.
つきにこの発明の一実施例にががるホログラフィカメラ
について図面を参照しながら説明する。
第１図において、レーザ光源１がらのレーザ光は、ミラ
ー（プリズム）２１．２２で反射されてビームスプリッ
タ３に入射させられ、ここで２つのビームに分けられる
。一方の光ビームは、ミラー（プリズム）２３．２４で
反射されることによって分散板４に導かれ、指向性が除
去される。この分散板４を経た光が照明光として広く測
定対象ｅ１６に照射される。
この測定対象物６の表面で散乱した光は、ミラー２５．
２６、レンズ５１．５２及びミラー２７を経てフォトセ
ンサ７に導かれる。
他方、上記のビームスプリッタ３で分けられた他方の光
ビームもまた、レンズ５３．５４及びミラー２８を経て
フォトセンサ７に導かれる。この光は、上記の散乱光に
対する参照光となる。すなわち、測定対象物６がら散乱
してきた散乱光の光路差により参照光とフォトセンサ７
の表面上で干渉を起こし、その干渉縞がフォトセンサ７
の表面上に形成される。
このフォトセンサ７は、光強度を電気的な信号に変換す
る２次元的な光電変換器であって、たとえばＣＣＤやフ
ォトダイオードアレイなどから構成される。あるいは干
渉縞が形成されたスクリーンに対し、置型の光電変換器
を水平、垂直方向に機械的に高速走査させる方式のもの
を使用することもできる。いずれにしても干渉縞の画像
の各画素の光強度を表す電気信号が得られ、これが信号
変換器８を経て適当な処理を施されるとともに所定の信
号形式に変換されて出力される。
なお、これらミラー２１〜２８、レンズ５１〜５４、フ
ォトセンサ７などは適当な筐体に納めておくことができ
る。
この場合、フォトセンサ７上に形成された画像（干渉縞
）を表す信号がリアルタイムで出力されるため、その出
力信号を画像モニター装置などに導くことにより、測定
対象物６の表面が刻々変化する様子を観察することがで
きる。また、写真記録された干渉縞を読み取るという迂
遠な方法を取らず、直接干渉縞の画像信号が得られるた
め、読み取り誤差などの入り込む余地がなく、この画像
信号を画像解析装置に送って正確な画像解析に供するこ
とができる。さらに、この出力された画像信号を磁気デ
ィスクや磁気テープあるいは光ディスクなどに記録する
ことにより、測定結果の保存を容易に行うことができる
。Finally, a holographic camera according to an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, laser light from a laser light source 1 is reflected by mirrors (prisms) 21 and 22 and is incident on a beam splitter 3, where it is split into two beams. One of the light beams is reflected by mirrors (prisms) 23 and 24 and guided to the dispersion plate 4, and its directivity is removed. The light that has passed through the dispersion plate 4 is widely irradiated onto the measurement target e16 as illumination light. The light scattered on the surface of the measurement object 6 is transmitted to the mirror 25.
26, lenses 51 and 52, and a mirror 27, the light is guided to the photosensor 7. On the other hand, the other light beam split by the beam splitter 3 is also guided to the photosensor 7 via lenses 53, 54 and mirror 28. This light serves as a reference light for the above-mentioned scattered light. That is, due to the optical path difference between the scattered light scattered from the measurement object 6, the reference light and the photosensor 7
interference occurs on the surface of the photo sensor 7.
formed on the surface of The photosensor 7 is a two-dimensional photoelectric converter that converts light intensity into an electrical signal, and is composed of, for example, a CCD or a photodiode array. Alternatively, it is also possible to use a system in which a stationary photoelectric converter mechanically scans a screen on which interference fringes are formed at high speed in the horizontal and vertical directions. In any case, an electrical signal representing the light intensity of each pixel of the interference fringe image is obtained, which is subjected to appropriate processing via the signal converter 8, and is converted into a predetermined signal format and output. Note that these mirrors 21 to 28, lenses 51 to 54, photosensor 7, etc. can be housed in a suitable housing. In this case, since a signal representing the image (interference fringes) formed on the photosensor 7 is output in real time, the surface of the measurement object 6 changes moment by moment by guiding the output signal to an image monitoring device or the like. You can observe the situation. In addition, since the image signal of the interference fringe can be directly obtained without taking the roundabout method of reading the interference fringe recorded in the photograph, there is no room for reading errors, and this image signal can be sent to an image analysis device to obtain accurate information. It can be used for image analysis. Furthermore, by recording the output image signal on a magnetic disk, magnetic tape, optical disk, etc., the measurement results can be easily saved.
この発明のホログラフィカメラによれば、測定対象物の
時間的変化をリアルタイムでモニタリングすることが可
能となるとともに、干渉縞の画像信号を画像解析装置な
どに直接送って正確な画像解析を行うことがてきるよう
にし、さらに測定結果の保存も容易である。According to the holographic camera of the present invention, it is possible to monitor temporal changes in the object to be measured in real time, and it is also possible to directly send image signals of interference fringes to an image analysis device for accurate image analysis. Furthermore, it is easy to save the measurement results.
第１図はこの発明の一実施例の模式図である。
１・・・レーザ光源、２１〜２８・・・ミラー、３・・
ビームスプリッタ、４・・・分散板、５１〜５４・・レ
ンズ６・・・測定対象物、７・フォトセンサ、８・・・
信号変換器。FIG. 1 is a schematic diagram of an embodiment of the present invention. 1... Laser light source, 21-28... Mirror, 3...
Beam splitter, 4...Dispersion plate, 51-54...Lens 6...Measurement object, 7. Photo sensor, 8...
signal converter.
Claims (1)
２方向に分ける手段と、分けられた一方の光を分散して
測定対象物に照射する分散手段と、測定対象物からの散
乱光と上記の分けられた他方の光とが導かれる２次元的
な光電変換手段とを備えることを特徴とするホログラフ
ィカメラ。(1) A means for generating coherent light, a means for dividing the light into two directions, a dispersion means for dispersing one of the divided lights and irradiating it onto the object to be measured, and scattering light from the object to be measured. and two-dimensional photoelectric conversion means to which the other divided light is guided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5069590A JPH03251888A (en) | 1990-02-28 | 1990-02-28 | Holographic camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5069590A JPH03251888A (en) | 1990-02-28 | 1990-02-28 | Holographic camera |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03251888A true JPH03251888A (en) | 1991-11-11 |
Family
ID=12866056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5069590A Pending JPH03251888A (en) | 1990-02-28 | 1990-02-28 | Holographic camera |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03251888A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009059008A1 (en) * | 2007-10-30 | 2009-05-07 | New York University | Tracking and characterizing particles with holographic video microscopy |
| US9316578B2 (en) | 2008-10-30 | 2016-04-19 | New York University | Automated real-time particle characterization and three-dimensional velocimetry with holographic video microscopy |
| US10641696B2 (en) | 2015-09-18 | 2020-05-05 | New York University | Holographic detection and characterization of large impurity particles in precision slurries |
| US10670677B2 (en) | 2016-04-22 | 2020-06-02 | New York University | Multi-slice acceleration for magnetic resonance fingerprinting |
| US10983041B2 (en) | 2014-02-12 | 2021-04-20 | New York University | Fast feature identification for holographic tracking and characterization of colloidal particles |
| US11085864B2 (en) | 2014-11-12 | 2021-08-10 | New York University | Colloidal fingerprints for soft materials using total holographic characterization |
| US11385157B2 (en) | 2016-02-08 | 2022-07-12 | New York University | Holographic characterization of protein aggregates |
| US11543338B2 (en) | 2019-10-25 | 2023-01-03 | New York University | Holographic characterization of irregular particles |
| US11948302B2 (en) | 2020-03-09 | 2024-04-02 | New York University | Automated holographic video microscopy assay |
-
1990
- 1990-02-28 JP JP5069590A patent/JPH03251888A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009059008A1 (en) * | 2007-10-30 | 2009-05-07 | New York University | Tracking and characterizing particles with holographic video microscopy |
| US8791985B2 (en) | 2007-10-30 | 2014-07-29 | New York University | Tracking and characterizing particles with holographic video microscopy |
| US9316578B2 (en) | 2008-10-30 | 2016-04-19 | New York University | Automated real-time particle characterization and three-dimensional velocimetry with holographic video microscopy |
| US10634604B2 (en) | 2009-01-16 | 2020-04-28 | New York University | Automated real-time particle characterization and three-dimensional velocimetry with holographic video microscopy |
| US11892390B2 (en) | 2009-01-16 | 2024-02-06 | New York University | Automated real-time particle characterization and three-dimensional velocimetry with holographic video microscopy |
| US10983041B2 (en) | 2014-02-12 | 2021-04-20 | New York University | Fast feature identification for holographic tracking and characterization of colloidal particles |
| US11085864B2 (en) | 2014-11-12 | 2021-08-10 | New York University | Colloidal fingerprints for soft materials using total holographic characterization |
| US10641696B2 (en) | 2015-09-18 | 2020-05-05 | New York University | Holographic detection and characterization of large impurity particles in precision slurries |
| US11385157B2 (en) | 2016-02-08 | 2022-07-12 | New York University | Holographic characterization of protein aggregates |
| US11747258B2 (en) | 2016-02-08 | 2023-09-05 | New York University | Holographic characterization of protein aggregates |
| US10670677B2 (en) | 2016-04-22 | 2020-06-02 | New York University | Multi-slice acceleration for magnetic resonance fingerprinting |
| US11543338B2 (en) | 2019-10-25 | 2023-01-03 | New York University | Holographic characterization of irregular particles |
| US11921023B2 (en) | 2019-10-25 | 2024-03-05 | New York University | Holographic characterization of irregular particles |
| US11948302B2 (en) | 2020-03-09 | 2024-04-02 | New York University | Automated holographic video microscopy assay |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1174494A (en) | Optical system for observation in real time with scanning | |
| US5796498A (en) | Holographic imaging | |
| JPH03251888A (en) | Holographic camera | |
| US4492468A (en) | Interferometer for the real time display of deformations of vibrating structures | |
| US5054913A (en) | Method and apparatus for measuring the velocity of a fluid using analysis of young's fringes in speckle photography | |
| US4277127A (en) | Dopler extended depth of field imaging system with coherent object illumination | |
| JPH11194018A (en) | Object information measuring device | |
| GB1263371A (en) | Improved ultrasonic imaging techniques and apparatus | |
| US3706965A (en) | Real-time acoustic imaging system | |
| EP0152186A2 (en) | Optical correlator | |
| JPS5610201A (en) | Object dimension measuring device | |
| JP2673196B2 (en) | 3D shape sensor | |
| SU1504498A1 (en) | Method and apparatus for determining the components of displacement vector of diffusely reflecting microobjects | |
| SU1404810A1 (en) | Unequal-arm laser interferometer | |
| JP2004279137A (en) | Apparatus for measuring dynamic shape and dynamic position at once | |
| JPS6140607U (en) | Microgap measuring device | |
| JP2801916B2 (en) | Defect inspection equipment | |
| SU1531143A1 (en) | Device for optical reproduction of relief-phase information | |
| Ruterbusch et al. | Multiplexed speckle and holographic interferometry with color encoding by white-light processing | |
| JP3046504B2 (en) | Particle measuring method and particle measuring device | |
| Garcia et al. | Visualization of deformation by secondary speckle sensing | |
| JPH0452704Y2 (en) | ||
| CN115291489A (en) | Incoherent light digital holographic imaging device based on dynamic grating | |
| SU422056A1 (en) | DEVICE FOR SYNTHESIS OF TWO-DIMENSIONAL AGREED FILTERS | |
| RU2159406C2 (en) | Multiple-beam interferometer to measure parameters of parameters of spherical shell |