IMAGE INTENSIFIERS
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IMAGE INTENSIFIERS - 1

IMAGE INTENSIFIERS

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IMAGE INTENSIFIERS - 2

Image IntensifierI. I.) were primarily developed for nighttime viewing and surveillance under Image intensifiers (often abbreviated as moonlight or starlight. Image intensifiers are capable of detecting and amplifying low-light-level images (weak emissions or reflected light) for bringing them into view as sharp contrast images. Image intensifier applications have spread from nighttime viewing to various fields including industrial product inspection and scientific research, especially when used with CCD cameras (intensified CCD or ICCD). Gate operation models are also useful for...

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Clear, sharp images can be obtained with no chicken wire. Proximity-focused configuration is more compact and lightweight than inverter type. Images without distortion can be obtained even at periphery. 5 HIGH-SPEED GATE OPERATION High-speed gated image intensifiers are available for imaging and motion analysis of high-speed phenomena. 6 HIGH SENSITIVITY GaAs AND GaAsP PHOTOCATHODE Excellent image intensification with an even higher signal-to-noise ratio is achieved by combining our filmless MCP fabrication technology with the high-sensitivity GaAs and GaAsP photocathode. ISTRUCTURE In...

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IMAGE INTENSIFIERS - 4

GSTRUCTURE AND OPERATION STRUCTURE Figure 1 shows the structure of a typical image intensifier. A photocathode that converts light into photoelectrons, a microchannel plate (MCP) that multiplies electrons, and a phosphor screen that reconverts electrons into light are arranged in close proximity in an evacuated ceramic case. The close proximity design from the photocathode to the phosphor screen delivers an image with no geometric distortion even at the periphery. Types of image intensifiers are often broadly classified by "generation". The first generation refers to image intensifiers that...

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IMAGE INTENSIFIERS - 5

GGLOSSARY OF TERMS Photocathode Sensitivity Dark Count Luminous Sensitivity: The output current from the photocathode per the input luminous flux from a standard tungsten lamp (color temperature: 2856 K), usually expressed in µA/lm (microamperes per lumen). Luminous sensitivity is a term originally for sensors in the visible region and is used in this catalog as a guideline for sensitivity. Radiant Sensitivity: The output current from the photocathode per the input radiant power at a given wavelength, usually expressed in A/W (amperes per watt). Quantum Efficiency (QE): The number of...

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GSELECTION CRITERIA (Factors for making the best choice) Items Effective Area #Select the effective area that matches the readout method. Description/Value Selectable Range The 25 mm (16 mm × 16 mm A) diameter type transfers a larger amount of image 18 mm (13.5 mm × 10 mm) A information to a readout device coupled by using a reduction optical system such as a relay lens and tapered FOP. This lets you acquire high resolution images. 25 mm (16 mm × 16 mm) A The 18 mm diameter type (13.5 mm × 10 mm) is compatible with 1-inch CCDs. Features Transmitting Wavelength Window Type 160 nm or longer...

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long decay time is suggested to minimize flicker. Figure 5 shows typical phosphor spectral emission characteristics and Figure 6 shows typical decay characteristics. We also supply phosphor screens singly for use in detection of ultraviolet radiation, electron beams and X-rays. INPUT WINDOWS Figure 4: Typical Transmittance of Window Materials 100 Figure 5: Typical Phosphor Spectral Emission Characteristics 100 FIBER * OPTIC PLATE MCP (MICROCHANNEL PLATE) An MCP is a secondary electron multiplier consisting of an array of millions of very thin glass channels (glass pipes) bundled in parallel...

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IMAGE INTENSIFIERS - 8

GSELECTION GUIDE (by wavelength) THIRD GENERATION Suffix Wave- A Input Window C length /Index of of Peak Response Refraction n D (nm) (nm) Borosilicate Glass 370 to 920 650 to 750 /1.49*3 Borosilicate Glass 280 to 820 480 to 530 /1.49*3 Borosilicate Glass 280 to 720 480 to 530 /1.49*3 Borosilicate Glass 360 to 1100 700 to 800 /1.49*3 Spectral Response Range Effective Photocathode Area GaAs Enhanced Red GaAsP GaAsP InGaAs Standard Standard Gate Function E Phosphor Output NOTE Screen Window 1 stage MCP G 2 stage MCP G 1 stage MCP P43 FOP 2 stage MCP 1 stage MCP P43 FOP 2 stage MCP 1 stage MCP...

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IMAGE INTENSIFIERS - 9

13.5 mm × 10 mm 5 ns High Quantum NIR High Sensitivity 1 µm Type Efficiency 16 mm × 16 mm 5 ns non High Quantum NIR High Sensitivity High Quantum NIR High Sensitivity Efficiency Efficiency 18 mm 250 ps F 200 ps F non — High-speed Gate High-speed Gate High Resolution SECOND GENERATION Hamamatsu second generation image intensifiers are classified by series type No. and suffix No. When you consult with our sales office about a product or place an order, please carefully refer to the characteristics listed in the spec table. If you need custom devices (using a different window or phosphor...

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IMAGE INTENSIFIERS - 10

GCHARACTERISTICS THIRD GENERATION 3 Type No. Effective Photocathode Area 13.5 mm × 10 mm Wavelength Stage Suffix Gate Photocathode of Peak of (Spectral Response Range) Function Material Response MCP (nm) Both type 1 GaAs 600 to 750 -71 (370 nm to 920 nm) are 2 avairable -71 (370 nm to 920 nm) -73 (280 nm to 820 nm) Both type are avairable Both type are avairable GaAs Enhanced Red GaAsP GaAsP Enhanced Red GaAsP Both type are avairable Both type are avairable V6833P, V7090P (Effective Photocathode Area: Wavelength Stage Suffix Gate Photocathode of Peak of (Spectral Response Range) Function...

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(These specifications shown in this table are typical value.) Photocathod Sensitivity 5 5 Luminous Radiant Quantum Efficiency Sensitivity Sensitivity (QE) (%) (µA/lm) (mA/W) Equivalent Background Input (EBI) Limiting Resolution Storage Maximum Maximum Ambient Vibration Shock Temperature (Lp/mm) (°C) 64 40 50 Equivalent Background Input (EBI) Limiting Resolution Storage Maximum Maximum Ambient Vibration Shock Temperature (Lp/mm) (°C) 64

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IMAGE INTENSIFIERS - 12

GCHARACTERISTIC GRAPHS Figure 7: MTF Third Generation SPATIAL RESOLUTION (Lp/mm) Figure 11: Shutter Ratio (color temperature: 2856 k) RELATIVE PHOSPHOR SCREEN INTENSITY Figure 10: Photocathode Illuminance vs. Phosphor Screen Luminous Emittance PHOSPHORE SCREEN LUMINOUS EMITTANCE (lm/m2) Figure 9: Equivalent Background Input (EBI) vs. Temperature SPATIAL RESOLUTION (Lp/mm) Figure 8: Luminous Gain vs. MCP Voltage (V8070 Series) 108 MCP-IN – MCP-OUT = 900 V dc MCP-OUT – PHOSPHOR SCREEN = 6000 V dc PHOTOCATHODE POTENTIAL TO MCP-IN (V)

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