JP2942612B2 - Image detection recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to photochemical hole burning.
The present invention relates to a two-dimensional image detection and recording apparatus using a recording element utilizing the phenomenon of hole burning (hereinafter, referred to as a PHB recording element).

[Conventional technology]

FIG. 8 is a diagram showing a basic configuration of a conventional image detection and recording device. As shown in the figure, this device is used to
A drive source 3 having a built-in excitation light source 2 for irradiating light to a light source, and a gate II (image intensifier) tube 4 having a photoelectric surface formed on an input surface side and a fluorescent surface formed on an output surface side.
An imaging lens 5 for imaging light (for example, fluorescent light or reflected light) from the DUT 1 on the input surface of the gate II tube 4; a camera 6 for imaging the fluorescent surface of the gate II tube 4; A monitor TV 7 for displaying video information from the camera 6 as an image is provided. Further, a gate power supply 8 for driving the gate is connected to the gate II tube 4, and a drive source 3 for the DUT 1 is connected to the gate power supply 8 via a time delay circuit 9 to drive the drive source 3. The gate power supply 8 for the gate II tube 4 is operated with a delay from the timing.

According to this apparatus, the light from the DUT 1 irradiated with the light from the light source 2 is transmitted to the gate II tube 4 by the imaging lens 5.
Image on the input surface of. At this time, when the DUT 1 repeatedly moves at high speed, the delay circuit 9 is operated in synchronization with the repetition period, and the gate power supply 8 sequentially operates the gate II tube 4. This makes it possible to observe a temporal change of the DUT 1 using the gate time as the sampling time. The image at this time is converted into an electric signal by the camera 6 and can be viewed on the monitor TV 7.

[Problems to be solved by the invention]

According to the above-described image detection device, a temporal change can be observed in the case of a repetitive motion, but other single high-speed motions can only capture an image of a time fragment determined by a gate time. Temporal changes cannot be observed. .

On the other hand, Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. 13528 and JP-A-63-113533 are known. The former is characterized in that the above image is formed on a PHB recording element to obtain the logical operation value of the image by transmitted light in order to obtain the logical operation value of the parallel image, and the basic principle of the latter is the same as the former. Are identical. Therefore, it is not a technique for continuously detecting and recording the movement (temporal change) of the measured object as an image.

The present invention provides an image detection and recording device that solves these problems.

[Means for solving the problem]

The image detection and recording apparatus according to the present invention includes a spatial light modulator that receives time-varying spatial light information from an object to be measured and writes the spatial light information as two-dimensional information that varies with time. An information reading means for irradiating the changing laser light to the spatial light modulating means to read two-dimensional information changing with time, and a recording member made of a photochemical hole burning material.
Recording means for irradiating a reading light containing dimensional information and recording on a recording member.

In the present invention, a means may be provided in which the wavelength of the laser light applied to the spatial light modulating means is fixed, and a time-varying electric field is applied to the recording member.

[Action]

According to the present invention, since spatial light information that changes over time is input to the spatial light modulating means, the spatial light information is written as two-dimensional information in the form of, for example, a refractive index distribution that changes over time. Are read as laser light whose wavelength changes with time. Thus, for example, at times t ₁ , t ₂ ,
The spatial light information at t ₃ is read by the laser light having the wavelengths λ ₁ , λ ₂ , λ ₃ at these times, and is recorded on the recording member made of the photochemical hole burning material at the wavelengths λ ₁ , λ ₂ , λ ₃ . Written as optical information.

Also, instead of changing the wavelength of the laser beam, the electric field applied to the recording member is changed to E ₁ , E ₂ , E ₃ at times t ₁ , t ₂ , t ₃ , for example.
Is changed, the recording member is written as optical information in the electric fields E ₁ , E ₂ and E ₃ .

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a basic configuration diagram of a high-speed image detection and recording device according to the embodiment. As shown in the drawing, the DUT 1 is disposed at a position where light from the light source 2 is irradiated, and an imaging lens 5 and a spatial light modulation tube 10 are sequentially arranged beside the DUT 1. Here, the spatial light modulator tube 10 has a photoelectric surface 10a on the input surface on the side of the imaging lens 5 and a dielectric crystal 10b exhibiting a nonlinear optical effect on the output surface on the opposite side, and is not shown inside. An electronic lens and the like are provided. Therefore,
When an optical image of the DUT 1 is formed on the photocathode 10a, a corresponding charge image is formed on the dielectric crystal 10b, and an electric field caused by the electric field causes the dielectric crystal 10b to receive spatial light information. A refractive index distribution corresponding to the optical image of the measurement object 1 is formed as two-dimensional information.

On the output surface side of the spatial light modulation tube 10, a half mirror 11 inclined at 45 degrees to the optical axis, a collimator lens 12, a pinhole plate 13 for forming a pinhole on the optical axis, and an objective lens 14 And a wavelength tunable laser light source 15 capable of variably changing the wavelength of the output laser light. Therefore, the laser light emitted from the wavelength tunable laser light source 15 is narrowed down at the pinhole position of the pinhole plate 13, converted into a parallel light beam by the collimator lens 12, and It is incident on the output surface. This incident light acts as reading light for two-dimensional information formed as a refractive index distribution on the dielectric crystal 10b, where it is subjected to phase modulation and reflected. The reflected light is reflected by the half mirror 11, and is incident on the PHB recording element 17a in the recording device 17 via the imaging lens 5 and the analyzer 16. Here, since the reflected light has phase information corresponding to the refractive index distribution of the dielectric crystal 10b, the reflected light passes through the analyzer 16 that converts the amount of phase displacement into the amount of amplitude displacement, thereby obtaining light intensity information. As a result, an optical image corresponding to the optical image of the DUT 1 formed on the photoelectric surface 10a of the spatial light modulator 10 is formed on the PHB recording element 17a made of a photochemical hole burning material.

Next, the operation of the high-speed image detection and recording device according to the above embodiment will be described.

First, assuming that the light from the DUT 1 changes at high speed with time, the optical image formed on the photoelectric surface 10a of the spatial light modulator 10 also changes at high speed with time. Therefore, the charge image formed on the dielectric crystal 10b of the spatial light modulator 10 also changes at a high speed, and the refractive index distribution, that is, the two-dimensional information, changes at a high speed with time. At this time, the tunable laser light source 15 is designed to output a laser beam whose wavelength changes with time in synchronization with the time change of the optical image from the DUT 1. Then, the reading light output from the dielectric crystal 10b side of the spatial light modulation tube 10 has optical information corresponding to a time change of the light from the DUT 1 as two-dimensional phase information. The time change corresponds to the change in the wavelength of the reading light.

This will be described more specifically. For example, time points t ₁ , t ₂ , t ₃
In an optical image formed on the photoelectric surface 10a of the spatial light modulator tube 10 is to be _{P 1, P 2, P 3} , the wavelength of the laser beam is lambda ₁ from the tunable laser 15 at that time, lambda _2, It assumed to be λ _3. Then, two-dimensional information corresponding to an image P ₁ of the time t ₁ is a read light having a wavelength lambda _1, 2-dimensional information corresponding to an image P ₂ of the time t ₂ is read beam having a wavelength lambda _2, the time point t ₃ 2-dimensional information corresponding to an image P ₃ at a wavelength lambda ₃ reading light, is read as phase information of each 2-dimensional. Then, the phase information is converted by the analyzer 16 into amplitude information. Thus, the image the image P ₁ at a wavelength lambda ₁ in PHB recording element 17a is an image P at a wavelength lambda _2
Second image is the image of the image P ₃ is formed at a wavelength lambda _3. Here, the PHB recording element 17a is described in, for example, Japanese Patent Application Laid-Open No. 1-40391.
As shown in JP Since image can be recorded for each wavelength, an image of the image P _1, P _2, P ₃ are recorded at high speed.

As the tunable laser light source 15 shown in FIG. 1, for example, an optical parametric oscillator shown in FIG. 2 can be used. This device is a pump light source YAG laser device 15a
When a harmonic generator 15b consisting future nonlinear crystal which laser light is incident, and a filter 15c for transmitting only future harmonics, a pair of mirrors 15d ₁ and a mirror 15d ₂ which constitutes a laser resonator, It is composed of a parametric crystal 15e provided between them. In such an optical parametric oscillator, when a laser beam of a predetermined wavelength enters the harmonic generator 15b from the YAG laser device 15a, a harmonic having the incident light as a fundamental wave is generated from the harmonic generator 15b. Then, only the laser light of this harmonic component is incident as excitation light (pump light) on the parametric crystal 15e via the filter 15c. Then, the induced light is generated by the parametric crystal 15e, laser oscillation by the mirror 15d _1, 15d _2.

At this time, if the angle between the optical axis of the harmonic laser light (excitation light) incident through the filter 15c and the crystal axis of the parametric crystal 15e is changed, the light is generated from the parametric crystal 15e as shown in FIG. The wavelength of the guided light changes. Therefore, since a laser output capable of variably controlling the wavelength can be obtained by rotating the parametric crystal 15e, if the parametric crystal 15e is rotated stepwise,
A laser light output whose wavelength changes stepwise is obtained.

In the present embodiment, detection and recording of an image are performed using the laser light whose wavelength changes stepwise. In the apparatus shown in FIG. 1, for example, when the x and y coordinates are set on the input surface of the spatial light modulation tube 10 and the time is t, the photoelectric surface of this input surface
The spatial light information input to 10a is expressed as f ₀ (x, y, t).
Then, it is assumed that the light intensity at coordinates (x, y) of an image obtained by two-dimensionally projecting the three-dimensional DUT 1 onto the spatial light modulation tube 10 changes as shown in FIG. Then, this is read by the laser light from the optical parametric oscillator whose wavelength changes stepwise as shown in FIG. 4 (b), so that the spatial light information f ₀ (x, y, t), which is a function of time, 4 Two-dimensional information f ₀₁ (x ₁ , y ₁ , λ) which is a function of wavelength as shown in FIG.
Is read as

On the other hand, as the PHB recording element 17a, for example, an element using a porphyrin derivative as a guest and polyvinyl alcohol as a host is effective. In this case, when a material having a continuous absorption spectrum shown in FIG. 5A is irradiated with a laser beam having an arbitrary wavelength selected from the absorption wavelength range of the guest, it is shown in FIG. 5B. The absorbance at that wavelength decreases. This reduced portion is called a hole, and the number of holes depends on the absorption wavelength range and the wavelength width in which holes are formed. The latter tends to be smaller at lower temperatures, so the information amount increases at lower temperatures. Therefore, when a PHB element is used as a recording medium, it is exclusively used at liquid nitrogen temperature or liquid helium temperature. Note that the number of holes can be further increased by using a plurality of types of guest molecules by taking advantage of the characteristics of the wavelength tunable laser.

In the present embodiment, since the above-described configuration is used, a large amount of information about the time-varying DUT can be obtained by changing the wavelength of the irradiated laser light with time.
Recording can be performed on the PHB recording element 17a.

Next, an example of a device for reproducing a recorded image from the recording device 17 on which an image is recorded by the device shown in FIG. 1 will be described.

FIG. 6 is a configuration diagram of such a reproducing apparatus. As shown in the figure, this device comprises a tunable laser light source 15, a collimator lens 12, a pinhole plate 13
And an objective lens 14. Here, the PHB recording element 17a in the recording apparatus 17 has an image is recorded for each wavelength, recording light intensity f in the coordinate (x _1, y _1)
01 (x ₁ , y ₁ , λ) corresponds to FIG.
Let's say In this state, if the wavelength of the reproduction laser beam incident on the recording device 17 shown in FIG. 6 is changed, for example, as shown in FIG. 7B, an image of each wavelength can be taken out. At this time, the speed at which the wavelength of the laser beam for reproduction changes (reproduction time) can be arbitrarily set without depending on the speed of the wavelength change at the time of recording.

The present invention is not limited to the above embodiment, and various modifications are possible.

For example, in the above embodiment, a large number of images are recorded on the PHB recording element 17a by changing the wavelength of light, but they change over time by applying an electric field of varying intensity to the PHB recording element 17a. Multiple images can be recorded. In this case,
In the apparatus shown in FIG. 1, the wavelength of a laser beam for reading information written in the derivative crystal 10b of the spatial light modulator 10 is set to be constant. Then, a device for applying a changing electric field is attached to the PHB recording element 17a for recording the read information. Then, the intensity of the electric field applied to the PHB recording element 17a is temporally changed in synchronization with the temporal change of the input information. By adopting such a method, two-dimensional information that changes over time is read with a laser beam of a single wavelength, and a large amount of information is changed by changing the electric field strength and the PH.
The data can be recorded on the B recording element 17a and thereafter reproduced by changing the intensity of the electric field.

The wavelength of the laser beam at the time of reading information is changed with time, and at the same time, when information is recorded, the PHB recording element 17a is used.
If the electric field applied to is changed with time,
The amount of information to be recorded can be further increased.

Although the embodiments of the present invention have been described above, in addition to these devices, for example, when a measurement target is irradiated with a tunable laser and its reflected light is used, a temporal change is directly applied to the PHB recording element. Can be recorded and played. Further, by irradiating the PHB recording element with the reference light, it is possible to record and reproduce a three-dimensional temporal change of the object.

〔The invention's effect〕

According to the configuration of the present invention, since spatial light information that changes over time is input to the spatial light modulating means, the spatial light information is converted into two-dimensional information in the form of, for example, a refractive index distribution that changes over time. This is written and read as laser light whose wavelength changes over time. The same can be achieved by changing the intensity of the electric field applied to the recording member over time. Therefore, two-dimensional information can be recorded at a high speed, and the amount of information that can be recorded and stored increases. Further, it is possible to reproduce required two-dimensional information from the stored large amount of information as needed.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a high-speed image detection and recording apparatus according to an embodiment of the present invention, FIG. 2 is a configuration diagram of an optical parametric oscillator used in the embodiment of the present invention, and FIG. FIG. 4 is a diagram showing characteristics, FIG. 4 is a diagram showing a wavelength change with respect to a recording target time waveform, FIG. 5 is a diagram showing a PHB hole generation state before and after laser beam irradiation, and FIG. 6 is a diagram showing a basic configuration of a reproducing apparatus. FIG. 7 is a diagram showing a waveform for reproducing a change in wavelength with respect to time during reproduction, and FIG. 8 is a basic configuration diagram of a conventional image detection / recording apparatus. 1 ... measurement object, 2 ... light source, 5 ... imaging lens, 10 ...
… Spatial light modulator tube, 10a …… Photocathode, 10b …… Dielectric crystal,
11 Half mirror 12 Collimator lens 13
Pinhole plate, 14 objective lens, 15 tunable laser device, 15a YAG laser device, 15b harmonic generator, 15c filter for fundamental wave cut, 15d ₁ and 15d ₂
…… Mirror for resonator, 15e …… Parametric crystal, 1
6 ... Analyzer, 17 ... Recording device, 17a ... PHB recording element.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshiaki Ito 1126-1, Nomachi, Hamamatsu-shi, Shizuoka Prefecture Inside Hamamatsu Photonics Co., Ltd. (56) References JP-A-53-99735 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03C 1/72, 5/56 G11B 7/00 H04N 5/76

Claims (3)

(57) [Claims] 1. Spatial light modulating means to which time-varying spatial light information from an object to be measured is input and which is written as time-varying two-dimensional information; Irradiating the spatial light modulating means to read the time-varying two-dimensional information; and an information reading means, comprising a recording member made of a photochemical hole burning material,
A recording unit for irradiating the recording member with reading light including two-dimensional information read by the information reading unit, and recording the recording member. 2. The image detecting and recording apparatus according to claim 1, wherein said recording means further comprises an electric field applying means for applying an electric field whose intensity changes with time to said recording member. 3. A spatial light modulating means to which time-varying spatial light information from an object to be measured is input and which is written as time-varying two-dimensional information, and irradiates the spatial light modulating means with laser light. And information reading means for reading the time-varying two-dimensional information, a recording member made of a photochemical hole burning material, and electric field applying means for applying a time-varying electric field to the recording member. Recording means for irradiating the recording member with reading light containing two-dimensional information read by the information reading means and recording the recording light.