JPS6125089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that detects or measures the intensity of infrared rays using a pyroelectric element having a film-like pyroelectric layer, and visualizes the detected infrared rays using an infrared phosphor.

By visualizing the infrared laser beam, it is possible to determine the oscillation mode of the infrared laser, and at the same time, by detecting the oscillation output of the laser, a lot of important information can be obtained.

As a method of visualizing infrared laser beams and determining the oscillation mode, if you irradiate infrared rays while there is an afterglow even after being stimulated in advance, only that part will become brighter or darker, and in some cases, there may be an afterglow. There is a method of using an infrared phosphor as a phosphor that exhibits a remarkable depletion phenomenon that shows emission of different colors. Examples of infrared phosphors include zinc sulfide phosphors, which contain zinc sulfide (ZnS) as the main component.
This is a phosphor containing copper, silver, and lead as heavy metal activators. SrSe as another infrared phosphor
Those activated with Tl and CdS activated with Eu are used. Long-wave ultraviolet rays, cathode rays, X-rays, α-rays, β-rays, etc. are used to stimulate the phosphor.

In particular, in the case of a phosphor that exhibits an exhaustion effect where the fluorescence rapidly disappears when irradiated with infrared rays while in a fluorescent state, for example, an infrared phosphor whose main component is Cu-activated ZnS, You can view negative photographic film in a positive light.

Further, an infrared power meter is used as a method of measuring the amount of infrared rays irradiated at this time. Specific examples of existing infrared power meters include (i) thermocouples;
(ii) Golay cells; (iii) bolometers; (iv) thermal detectors of the pyroelectric detector type; (v) photoconductive detectors; (vi) photovoltaic detectors; and (vii) photodetectors of the photoelectromagnetic detector type. . However, using these existing infrared power meters,
Since infrared rays do not pass through these devices, it is not only difficult to simultaneously observe the oscillation mode of the infrared laser beam or the above-mentioned negative photographic film in a positive manner, but also the non-observable light beam. Therefore, there are problems such as that it takes time and effort to accurately install the power meter on the optical path.

The inventors of the present invention have conducted intensive research into a device that can simultaneously measure the overall intensity of the light beam and/or the intensity distribution of the image formed by the light beam, while using an infrared phosphor to deplete and visualize the image formed by the light beam. As a result of my efforts, I invented it.

Next, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows a preferred embodiment of the device of the present invention,
1 is a light source, 2 is an optical chopper, 3 is a pyroelectric element 6 having electrodes 5 and 5' attached to a pyroelectric film 4, is an oscilloscope, 7 is a silicon plate, 8 is a negative photographic film, and 9 is an exhaust effect. An infrared visualization device includes a fluorescent plate 10 and an ultraviolet lamp 11, and 12 is a detection circuit including the oscilloscope 6, an amplifier, and the like.

In such a device, substantially parallel white light including infrared radiation emitted from a light source 1 is energized to a pyroelectric element 3 placed after an optical chopper 2 (chop frequency 20 Hz), causing the pyroelectric element 3 to generate heat. By causing the pyroelectric element 3 to generate pyroelectricity and measuring this pyroelectricity using the detection circuit 12, the intensity of the light beam passing through the pyroelectric element 3 can be measured. Furthermore, the light beam passing through the pyroelectric element 3 is converted into only infrared light by a silicon plate 7, and then a negative image on the photographic film 8 is projected onto an infrared visualization device 9 through a negative photographic film 8, whereby a positive image is observed. Ru.

For example, the pyroelectric element 4 used for the pyroelectric element 3 has a pyroelectric constant dP _S /dT=4×10 ^-9 C/cm ² deg・ at 23°C.
It is made of a transparent polyvinylidene fluoride (PVDF) film with a thickness of 8 μm, and Nesa glass is provided as electrodes 5 and 5' on both sides of the film. In this case, the S/N ratio of the pyroelectric output voltage obtained by the detection circuit 12 was about 30 times. still,
When the PVDF pyroelectric film is completely made into a sandwich state using Nesa Glass, noise voltage due to piezoelectricity due to wind and the like and noise voltage due to pyroelectricity due to slow changes in ambient temperature can be removed.

Further, in this case, the sharpness of the positive image transferred to the infrared visualization device 9 was almost the same as when the pyroelectric element 3 was not inserted. This method therefore allows the intensity of the irradiated light to be measured simultaneously without any negative effect on the performance of the infrared visualization device.

Incidentally, the ultraviolet light lamp 11 that stimulates the fluorescent plate 10 in advance can also be placed in front of the fluorescent plate 10. Further, the detection circuit 12 includes an amplifier and an oscilloscope 6, but the oscilloscope 6 can be replaced with or used in combination with another meter such as a voltmeter, and can also be combined with a recording device, a storage device, a transmission device, etc. It's okay.

FIG. 2 shows a preferred embodiment of the apparatus of the present invention, which is capable of simultaneously measuring the intensity distribution of the light beam passing through the negative photographic film 8 and reversing the negative to positive.

In this example, the electrode plate 15 provided on one side of the pyroelectric polymer film 14 is, for example, as shown in FIG.
The other electrode plate 15' is constructed with a point coordinate electrode or a solid electrode of a similar Nesa vapor deposited film provided at least at a position facing this point coordinate electrode. Note that 20 is a field effect transistor for impedance conversion.
These piezoelectric polymer films 14 and both electrode plates 1
A pyroelectric element 13 having a set of 5 and 15' is placed between the negative film 8 and the infrared visualization device 9, and after the negative image on the negative film 8 passes through the pyroelectric element 13, it is transferred to the visualization device. will be projected on. When transmitted through the pyroelectric element 13, pyroelectricity is generated at each point coordinate electrode 17 on the electrode plates 15, 15' in accordance with the density of the negative image, and this is led separately to the detection circuit 12' to detect the intensity distribution of the infrared rays. By measuring, the shape of the negative image can be recognized.

In addition, if the pyroelectric element 3 with solid electrodes on both poles used in FIG. can be calculated. Therefore, for example, this film can be used to take photographs of maps, statistical graphs, measurement graphs of experimental values, etc. in which the area of the figure whose area is to be measured has been filled in, or even cut out of these figures. If the remaining cutout frames are used in place of the film, it is possible to visualize these shapes and measure their areas at the same time.

The fluorescent plate may be, for example, a transparent glass or plastic plate coated on one side with a fluorescent paint having a depleting effect.

The structure of the pyroelectric element is not limited to the above example, and when placed in front of a visualization device as shown in Figures 1 and 2, for example, a transparent electrode such as a Nesa film or a transparent electrode such as a Nesa film may be placed directly on the pyroelectric film. , one provided with a semitransparent electrode such as a thin gold vapor-deposited film can be used.

In addition, for point coordinate electrodes, a plurality of parallel conductor films may be provided on both sides so that lines on the same plane are parallel and lines on different planes intersect with each other, and the intersection point may be used as the electrode coordinate point. A ground electrode consisting of a solid electrode is placed on one side, and two pyroelectric films each having a parallel linear conductor film on the opposite side are stacked with the ground electrode sandwiched in between so that the parallel lines of the films intersect. The intersection of the parallel conductor lines of both films can be used as the electrode coordinate point, or any other structure can be used.

Furthermore, the pyroelectric film used in the pyroelectric element 3 is not limited to polyvinylidene fluoride, and for example, vinyl fluoride,
Vinylidene fluoride, chlorofluorovinylidene, vinyl chloride, vinylidene chloride, acrylonitrile,
Polymer pyroelectric films obtained by polarizing films of polymers or copolymers whose main component is methyl methacrylate or other polar monomers, lead titanate, barium titanate, lead zirconate, Lead titanium zirconate or any other inorganic pyroelectric film may be used, and these pyroelectric films may be transparent or semi-transparent if the pyroelectric element is placed in front of a visualization device as shown in Figure 1 or Figure 2. Preferably, it is transparent. The electrodes on the pyroelectric film may be integrated with the pyroelectric film, for example by vapor deposition or adhesion, or may simply be brought into contact with the electrode layer.

Note that the pyroelectric film does not necessarily have to have uniform pyroelectricity over the entire surface, and in a pyroelectric element in which point coordinate electrodes are combined, it is sufficient that only each electrode coordinate point has uniform pyroelectricity.

In addition, since the pyroelectric element only observes temperature changes, Chopper 2 is intended to give temperature changes during observation, but it can also be replaced with a shutter, and it can be completely removed by turning the light source on and off. You can also do it.

[Brief explanation of the drawing]

1 and 2 are explanatory diagrams of a preferred specific example of the device of the present invention, and FIG. 3 is an explanatory diagram of another preferred specific example of the electrode plate, etc. DESCRIPTION OF SYMBOLS 1... Infrared light source, 2... Chopper, 3... Pyroelectric element, 4... Pyroelectric film, 5... Electrode, 6... Oscilloscope, 7... Silicon plate, 8... Film, 9... ...Infrared visualization device, 10... Fluorescent plate, 1
1... Ultraviolet lamp, 12... Detection circuit.

Claims (1)

[Scope of Claims] 1. An infrared detection means comprising a pyroelectric element having a film-like pyroelectric layer in which at least each electrode coordinate point has uniform pyroelectricity, and an infrared detection means on the same infrared optical path as the pyroelectric element. and a means for visualizing infrared rays using an infrared phosphor spaced apart from the pyroelectric element, and the pyroelectric element is transparent or translucent and partially transmits infrared rays, and An infrared detection and visualization device characterized in that the outer phosphor receives transmitted light from the pyroelectric element. 2. A patent claim characterized in that the pyroelectric layer is a film of a vinylidene fluoride polymer, a vinyl fluoride polymer, or a copolymer mainly composed of vinylidene fluoride or vinyl fluoride, which has pyroelectric polarization. The infrared detection and visualization device according to item 1. 3. The device according to claim 1 or 2, characterized in that a chopping device or shutter is provided before the pyroelectric element receives the light so that the optical path of the light beam to be detected and visualized is interrupted or opened/closed. Infrared detection and visualization equipment.