JPS6116689A - Image detecting device - Google Patents

Abstract

PURPOSE:To decompose a two-dimensional image which varies at a high speed and can not be decomposed with continuous time by a normal device and record or reproduce it by providing the 2nd frame memory which is stored with the output of the 2nd image pickup device at intervals of the 2nd reference light, and storing time-decomposed image at intervals of the 2nd reference light CONSTITUTION:A coherent image appearing on the output screen of an ITC device 2 which converts incoherent light into coherent light is affected by the 1st reference light and formed on the photoelectric surface of the 1st image pickup device 4 as a hologram image which varies momentarily and is superposed. This hologram image is connected to a projection device 11 through a digital-analog converter 10. The projection surface 11a of the projection device 11 is irradiated with the 2nd reference light from the 2nd reference light generating means to read a time-decomposed image. An image picked up by the 2nd image pickup device 18 is converted by an analog-digital converter 19 and each image corresponding to each deflection angle is stored on a video disk as the 2nd frame memory 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an image detection device that reproduces or stores a time-resolved optical image that changes at high speed.

More specifically, the present invention relates to an image detection device that can two-dimensionally capture and record or reproduce phenomena faster than television rate multiple times on the time axis.

(Prior Art) There is a desire to record a film-like recording of rapidly changing phenomena, such as fluorescent light emission from living cells excited by a laser beam, over time.

This includes methods of recording the only image at a specific point in time, or methods of pseudo-time resolution by taking advantage of repetitive phenomena and extracting parts corresponding to different times for each phenomenon. Various proposals have been made.

However, it is not easy to image or record two-dimensional phenomena faster than television rates.

Strobe photography is known as a time-resolved imaging method for two-dimensional images.

However, the flash time of a strobe light emitting device is on the order of milliseconds, and it is impossible to obtain time-resolved images shorter than this.

Furthermore, if living cells are intermittently and continuously irradiated with strobe light G, the effects of the irradiation may appear on the living cells, which may be undesirable.

2. Description of the Related Art Devices are known that operate a special imaging device for a fixed short period of time (time gated) and record changes in a two-dimensional image during that period.

However, it is not easy to apply temporal gates continuously at high speed.

Each of these methods is the result of integrating images within a certain time9, and since the time cannot be extremely shortened, it cannot be said that two-dimensional time information is accurately obtained.

A phenomenon that changes two-dimensionally is a function f (x, y,
t).

In photography or television technology, the integration results within a certain time are obtained as two-dimensional information, and the temporal changes within that integration time are detected as f (x, y, ' t). do not have.

(Objective of the Invention) The object of the present invention is to use a configuration that is completely different from the conventional one, in which a rapidly changing two-dimensional optical image f (x, y, t) is transmitted at each time t, .
t2. ...ti,..., f(x'.

y, tl), f (x, y, t2), ... f (x.

y, ti)+ . . . and outputs corresponding information at each time t'1. t2. An object of the present invention is to provide an image detection device that reproduces or records time-resolved images for each time...ti, . .

(Configuration of the invention).

In order to achieve the above object, an image detection device according to the present invention that time-resolves and reproduces a rapidly changing optical image includes a coherent optical image source that generates a coherent optical image to be detected, and a l-th laser light source. and a first optical deflection element that deflects the light emitted from the first laser light source, and the deflection angle of the first optical deflection element is adjusted multiple times during the change of the two-dimensional coherent optical image to be output. a first power source that is controlled at high speed to change the hologram, and a hologram that is superimposed in accordance with the number of deflections of the two-dimensional coherent optical image formed using the output light of the first optical deflection element as a reference light. a first imaging device that captures an image; a hologram reproduction device that reproduces the captured hologram image; a second laser light source; and a television imaging system that deflects light emitted from the second laser light source and uses the deflection angle for television imaging. The first image capturing speed is controlled at a speed slower than the imaging speed of the device.
a second reference light generating means that sequentially generates a second reference light having a deflection angle corresponding to the reference light; and a read image for each of the second reference lights is captured in a hologram image reproduced by the hologram reproduction device. and a read image reproduction device that reproduces a read image captured by the second image pickup device.

Further, the image detection device according to the present invention that records an optical image that changes at a high speed by time resolution is provided with a second frame memory that stores the output of the second imaging device for each of the second reference lights, It is configured to store time-resolved images for each of the second reference lights.

(Example) Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.

FIG. 1 shows an actual image recording apparatus according to the present invention, which reproduces or records a rapidly changing optical image by time-resolving it.

It is a block diagram showing a male side.

The image source 1 is a biological sample that is excited by pulsed light from a laser light source (not shown) and generates fluorescence that lasts for a short period of time, for example, 100 nano seconds, and disappears.

This two-dimensional optical image is converted into a coherent optical image by an ITC device 2 that converts incoherent light into coherent light. - A spatial light modulation tube can be used as the ITC device 2.

Note that when an image changing at high speed is formed by coherent light, the ITC device 2 is unnecessary.

The coherent image appearing on the output surface of the ITC device 2 is influenced by a first reference light described later, and is formed on the photocathode surface of the first imaging device 4 as a superimposed hologram image that changes every moment.

A magnifying imaging tube with high resolution is used as the first imaging device 4 for imaging the hologram.

The first reference light is transmitted through a first laser light source 6, a first optical deflection element 7, and a first power source 8 that excites the first optical deflection element 7.
made by.

The first power source is a sweep generator that generates a stepped voltage.

The first optical deflection element 7 is an acousto-optic crystal made of tellurium dioxide crystal, and deflects the light from the first laser light source 6 according to a device comprising a first power source 8 to generate a first reference light. do.

FIG. 3 is a graph showing the voltage of the power supply for generating the first reference light and the deflection angle of the reference light.

In synchronization with the generation of laser light that excites the image source 1, the first power source 8 generates a voltage V+ (t) that changes stepwise for a period of 100 nano sec as shown.

This voltage V1. (t), the deflection angle of the first reference beam is θ
It changes from to → θB.

During this time, the video information (hologram image) is sent to the first imaging device 4.
The image is captured by the analog-to-digital converter 5, converted into digital data, and stored in the first frame memory 9 as one superimposed hologram image.

This hologram image is connected via a digital-to-analog converter 10 to a projection device 1).゛Projection device 1
) is formed of liquid crystal whose transmittance changes depending on the electric field. The electric field converts the hologram image information into a digital-to-analog converter 1.

is formed by an electron beam based on the output (Z) of

A projection surface 1)a of the projection device 1) is irradiated with a second reference light (readout light) from a second reference light generation means, and a time-resolved image is read out.

The deflection angle of the second reference light is controlled at a speed slower than the imaging speed of the television imaging device, and reference lights having deflection angles corresponding to the first reference light are sequentially generated.

This second reference light is connected to the second laser light source 12 and the second reference light.

It is produced by a second optical deflection element 13 and a second power supply 14 that excites this second optical deflection element 13.

The second power supply 14 is a sweep generator that generates a stepped voltage.

Like the first optical deflection element 7, the second optical deflection element 13 is made of an acousto-optic crystal of tellurium dioxide crystal.

The second optical deflection element 13 deflects the light from the second laser light source 12 according to the voltage applied from the second power supply 14 .

FIG. 4 is a graph showing the voltage of the power source for generating the second reference light and the deflection angle of the reference light.

The second power supply 14 generates a voltage V2 (t) that changes stepwise over a period of 10 seconds as shown.

This voltage V2 (t) changes the polarization angle to θ^-θB in the same polarization range as the deflection angle of the first reference light.

The reproduced image (read image) is connected to a photocathode of a second imaging device 18 via a polarizing plate 16 and a lens 17.

The image taken by the second imaging device 18 is converted by an analog-to-digital converter 19 and stored in the second frame memory 20 for each image corresponding to each deflection angle. A video disk is used as this second frame memory 20.

In this way, the rapidly changing image of image source 1 becomes f
Each time (x, y, t) cannot be time-resolved using normal methods 1. ,12...t4. ...every time f (x
, y, tl), f (x, y, t2), -...f
(x, y, ti), ... are images at each time.

It can be recorded in the second frame memory 20 as a.

The switch 22 is a changeover switch for switching between directly outputting the output of the second imaging device 18 and outputting the contents of the second frame memory 20.

The output of the second imaging device 18 is displayed on the television monitor 2.
3, the television monitor 23 reproduces an image that changes depending on the change in the deflection angle of the second reference light.

A rapidly changing image f (x, y, t) of the image source 1 is generated at each time t, t2 . ...1) ...every time f (X
,7. αtl ), f (x, y, αt2)
.

・Reproduced as f (x, y, αti).

In this example, α is given by the following equation.

10sec / 100nanosec = 10
8, that is, changes in the two-dimensional image of the image source are enlarged 108 times and reproduced.

(Modifications) Various modifications can be made to the embodiments described in detail above within the scope of the present invention.

Although the device of the above embodiment is designed to perform time-resolved recording and reproduction of images that change at high speed using the same device, it is also possible to use dedicated devices for each.

Even if the output image of the first imaging device described above is recorded on a hologram dry plate or the like and placed at a position corresponding to the projection plane of the projection device, the same operation as the device of the embodiment described above can be achieved. At this time, the analog-to-digital converter 5 of the embodiment device,
The first frame memory 9 and the projection device 1) can be omitted.

Although acousto-optic elements were used as the first and second optical deflection elements in the apparatus of the embodiment, electro-optic elements such as KDP and BSO can also be used in the same manner.

Since the change in the deflection angle of the second reference light can be made sufficiently slow, the reflecting mirror 25 can be mechanically rotated as shown in FIG. 2 without using an acousto-optic element as in the previous embodiment. It can also be made to move.

Furthermore, the reproduction order of the time-resolved images can be arbitrarily changed, such as by not reproducing the images sequentially from the first image, but by reproducing images at a specific point in time, for example, the tcO time shown in FIG. 3, or in the reverse order.

(Effects of the Invention) As explained above, according to the image detection device according to the present invention, it is possible to time-resolve and record or reproduce a two-dimensional image that changes at a high speed, which cannot be resolved in continuous time by ordinary devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an image recording apparatus according to the present invention that records a rapidly changing optical image in a time-resolved manner. FIG. 2 is a schematic diagram showing a modification of the second reference light generating device. FIG. 3 is a graph showing the voltage of the power supply for generating the first reference light and the deflection angle of the reference light. FIG. 4 is a graph showing the voltage of the power source for generating the second reference light and the deflection angle of the reference light. 1... Image source 2... ITC device 3... Lens 4... First imaging device 5... Analog-digital converter 6... First laser light source 7... First Optical deflection element 8...First power supply 9...First frame memory 10...Analog-digital converter 1)...Projection device 12...Second laser light source 13...Second Light deflection element 14...Second power source 16...Polarizing plate 17...Lens 18...Second imaging device 19...Analog-digital converter 20...Second frame memory 21 ...Digital-to-analog converter 22...Selector switch

Claims (10)

[Claims] (1) a coherent light image source that generates a coherent light image of a detection target; a first laser light source; a first light deflection element that deflects light emitted from the first laser light source; a first power source that controls the deflection angle of the light deflection element at high speed so that it changes multiple times during the change of the two-dimensional coherent optical image of the detection target; and a first power supply that uses the output light of the first light deflection element as a reference light. a first imaging device that images a superimposed hologram corresponding to the number of times of deflection of the formed two-dimensional coherent optical image; a hologram reproducing device that reproduces the captured hologram image; and a second laser light source. and a second reference of the deflection angle corresponding to the first reference light by deflecting the light emitted from the second laser light source and controlling the deflection angle at a speed slower than the imaging speed of the television imaging device. a second reference light generation means that sequentially generates light; a second imaging device that captures a read image for each of the second reference lights on a hologram image reproduced by the hologram reproduction device; and the second imaging device. An image detection device that time-resolves and reproduces a rapidly changing optical image, which is composed of a read image reproduction device that reproduces a read image captured by the device. (2) The hologram reproducing device includes a first frame memory that stores a hologram image captured by the imaging device, and a projection device that projects the content stored in the frame memory. An image detection device that time-resolves and reproduces the optical image that changes at high speed according to item 1. (3) An image detection device for reproducing a rapidly changing optical image by time resolution according to claim 2, wherein the projection device is a projection device whose transmittance changes depending on an electric field. (4) The image detecting device for reproducing a rapidly changing optical image by time resolution according to claim 1, wherein the read image reproducing device is a television monitor. (5) the second reference light generating means includes a second optical deflection element that deflects the light emitted from the second laser light source and generates a second reference light on the image projected by the projection device; Claim 1, further comprising a second power source that controls the deflection angle of the second deflection element at a speed slower than the imaging speed of the television imaging device to generate a deflection angle corresponding to the reference light. An image detection device that time-resolves and reproduces the rapidly changing optical image according to item 1. (6) An image detection device for time-resolving and reproducing an optical image that changes at high speed according to claim 5, wherein the first and second deflection elements are acousto-optic crystals or electro-optic elements. (7) The two-dimensional coherent light image of the object to be detected is an image obtained by converting an incoherent light image generated by the sample into a coherent light image by a coherent light converting device, and changes at a high speed as set forth in claim 1. An image detection device that time-resolves and reproduces optical images. (8) The second reference light generating device is a device that deflects the light emitted from the second laser light source using a movable mirror. An image detection device that plays back images. (9) a coherent light image source that generates a coherent light image of a detection target; a first laser light source; a first light deflection element that deflects light emitted from the first laser light source; a first power source that controls the deflection angle of the light deflection element at high speed so that it changes multiple times during the change of the two-dimensional coherent optical image of the detection target; and a first power supply that uses the output light of the first light deflection element as a reference light. a first imaging device that images a superimposed hologram corresponding to the number of times of deflection of the formed two-dimensional coherent optical image; a hologram reproducing device that reproduces the captured hologram image; and a second laser light source. and deflecting the light emitted from the second laser light source and controlling the reconstructed image deflection angle at a speed slower than the imaging speed of the television imaging device to obtain a second deflection angle corresponding to the first reference light. a second reference light generating device that sequentially generates the reference beams of; a second imaging device that captures a read image for each of the second reference beams on a hologram image reproduced by the hologram reproduction device; and a second frame memory that stores the output of the imaging device for each of the second reference lights. (10) An image detection device for recording a rapidly changing optical image in a time-resolved manner according to claim 9, wherein the second frame memory is a video disc.