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Sorting Different Plastic Materials at High Speed

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Sorting Different Plastic Materials at High Speed 2019 03 COVER STORY PAGE 2 Sorting Different Plastic Materials at High Speed OPTO-SEMINCONDUCTOR PRODUCTS PAGE 16 ELECTRON TUBE PRODUCTS PAGE 22 SYSTEM PRODUCTS PAGE 23 Hyperspectral imaging for Low energy X-ray source that can High-speed, high-resolution digital identification of plastic materials be easily operated by a PC CMOS camera with low noise Cover Story InGaAs area image sensor for hyperspectral cameras Changing the Recycling of Plastic Infrared image sensor capable of detecting up to 2.55 μm (world’s longest*) * InGaAs area image sensors (according to our research) In May 2019, an amendment to the Basal Convention Hyperspectral imaging that improves the “screening accuracy” concerning regulations on the transporting and treatment of plastic of toxic waste across national borders was passed by an In addition to China (last year’s largest recipient) banning the reception of agreement among around 180 countries. plastic waste, the enactment of a regulation on exporting recycle resources to developing countries has increased the importance of recycling plastic waste. The main point of the agreement was to include the exporting and importing of plastic waste in the scope of the regulations. The key to effective plastic recycling is the identification of materials. Current- It drew a great deal of attention because the responsibility ly, a lot of the plastic waste is cut into little pieces with a shredder and then of developed countries, which relied on developing countries separated by materials. The screening method for this process that is receiv ing in the treatment of plastic waste, was made clear. a lot of attention recently is “hyperspectral imaging”, which distinguishes differences in plastics using infrared light. Hyper spectral imaging is a method Reduction of plastic waste is a pressing issue for the entire by which pixel-level spectrum information is acquired simultaneously with human race. Hamamatsu infrared image sensors will be at the image of the target object. It is a useful method to identify and classify the forefront of tackling this issue. materials that are difficult to distinguish by eyesight. A hyperspectral camera is used to acquire hyperspectral images. Like normal line cameras, scanning is performed by moving the target object (or camera). The input light passes through a slit, is dispersed along the Y-axis direction by a prism/grating, and is measured by an area image sensor. Because a unique spectrum can be obtained in the infrared wavelength range, depending on the plastic material, using a hyperspectral camera with a built-in infrared area image sensor allows highly accurate identification. Principle Hyperspectral camera Stored spectral information along X the Y-axis InGaAs area image Y sensor Prism /grating Disperses the input light along the Y-axis Wavelength Slit 2 News 2019 Vol. 3 NEW CURRENT PRODUCT G14674-0808W G13393-0808W 507 fps max. 228 fps max. Detecting infrared light up to 2.55 µm allows identification of resin. To meet these market demands, Hamamatsu developed and plastics coated with flame-retardant resin released the G14674-0808W featuring a cutoff wavelength of 2.55 μm, Hamamatsu has so far been producing InGaAs area image sensors which is the world’s longest in InGaAs area image sensors. In addition that can detect infrared light up to 1.7 μm, but in this spectral range, to making the InGaAs photodiode capable of handling longer wave- identification of plastic that includes flame-retardant resin was difficult. lengths, the readout circuit was also improved to achieve lower dark Therefore, there were demands for sensors that could detect wave- current and higher speed. The integration of this product into a hyper- lengths up to about 2.4 μm, which exhibit differences in spectrum spectral camera expands the range of recyclable materials that can be waveforms depending on the presence/absence of flame-retardant screened and encourages recycling rate improvement. Main features Low dark current An improved circuit that brings the voltage difference applied across the Cutoff wavelength: 2.55 μm anode and cathode of the photosensitive area closer to zero was adopted Hamamatsu has successfully reduced the amount of defects that to reduce the dark current that occurs in the photosensitive area. occur in the photo sensitive area by optimizing the composition ratio of InAs and GaAs in the InGaAs photo sensitive area and improving Spectral response the process used to produce the photosensitive area. As a result, we were able to realize InGaAs area image sensors that can detect Tchip = 15 deg. C. Tchip = -20 deg. C. (Typ.(Typ.)) 1.2 infrared light up to 2.55 μm. The product lineup also includes G14672-0808W G14674-0808W 1.0 1.69 / 1.85 / 2.15 μm cutoff wavelength types. G14671-0808W G14673-0808W 0.8 High-speed readout 0.6 (Typ.) Narrower transistor gate length was achieved by designing and 1.2 X G14672-0808W G14674-0808W manufacturing original optimized circuits (ROIC*) in Hamamatsu. 0.4 Y 1.0 ) G14671-0808W G14673-0808W Photosensitivity (A/W) We were able to shorten the electrical signal transmission path. 0.2 0.8 As a result, a frame rate of 507 fps max., which is more than 0.6 0 double that of the current product, was achieved. 0.8 1.01.2 1.41.6 1.8 2.02.2 2.42.6 2.8 0.4 Wavelength (μm) Photosensitivity (A/W *Readout Integrated Circuit 0.2 0 0.8 1.01.2 1.41.6 1.8 2.02.2 2.42.6 2.8 Wavelength (μm) Additional applications expected with the capability of handling of handling longer wavelengths, there is growing expectations for this longer wavelengths technique to be used in applications such as the degradation diagnosis Hyperspectral imaging is used in food, pharmaceutical, chemical, and of concrete structures and identification of tablets, which were difficult various other fields, not just in the identification of plastic.T he possi- in the past. Hamamatsu will continue to pursue the development of long- bili­­ties are limitless. With the development of image sensors capable wave length detection and develop products that meet customer needs. Example of plastic screening by hyperspectral imaging Visible image Spectral distribution Hyperspectral image 1 0.9 PVC 0.8 Acrylic 0.7 PET 0.6 PS 0.5 0.4 PVC Acrylic PET PS PVC Acrylic PET PS 0.3 Reflectance ratio (In collaboration with Spectral Application Research Laboratory Inc.) 0.2 0.1 Capture images along with wavelength 0 Extract characteristics by spectral information within the near infrared 1.31.5 1.7 1.92.1 distribution analysis and identify region (1.3 μm to 2.2 μm) Wavelength (µm) materials via image processing News 2019 Vol. 3 3 Content Medical Life ScienceDrug DiscoveryMeasurementAnalytical Semicond. Prod.Optical CommsSecurity Industry ND InspectionAcademic Research OPTO-SEMICONDUCTOR PRODUCTS 16 InGaAs Area Image Sensors G14671 to G14674-0808W 17 MPPC® (Multi-Pixel Photon Counter) S14160 Series 18 Si Photodiodes S12915 Series 19 Si Photodiodes S12742-220/-254/-275 20 InAsSb Photovoltaic Detector P13894-011CN 21 Infrared Detector Module with Preamp C12494-011LH ELECTRON TUBE PRODUCTS 22 Soft X-ray Source L13050 SYSTEMS PRODUCTS 23 ORCA®-Lightning Digital CMOS Camera C14120-20P LASER PRODUCTS 24 LD Irradiation Light Source SPOLD® L14140-21M 25 LD Irradiation Light Source SPOLD® L14140-11/-21/-31 COVER STORY APPLICATION REPORT 2 Changing the Recycling of Plastic 12 Applications of High Resolution Digital Cameras in Solar Tower Plants 14 Real-time Monitoring of Thermal Laser Processes COMpaNY NEWS 5 Hamamatsu Corporation’s 50th Anniversary Celebration SERVICE 6 Energetiq Celebrates Grand Opening of New Manufacturing Facility and 22 Global Exhibitions 2019 and 2020 Corporate Headquarters 23 Hamamatsu Photonics K.K. Sales Offices 8 Laser-Driven Light Sources for Ellipsometry IN FOCUS 10 High Stability, Long Life, High Intensity Pulsed Light Source Support Solutions to the 2020 SOx Regulation Problem Faced by the Maritime Shipping Industry 4 News 2019 Vol. 2 Company News 5 YEARS HAMAMATSU COrp. Hamamatsu Corporation’s 50th Anniversary Celebration Akira Hiruma, President and CEO of Hamamatsu Photonics K.K., and Craig Walling, Race car competition event to benefit Bridgewater-Raritan Middle School children. President of Hamamatsu Corporation, watch as retirees Mac Sawaki and Carol Simola, and our newest employee Brandon Gorakhnauth, break the sake barrel. Employees as well as retirees gathered to celebrate Hamamatsu messages of encouragement were donated to Bridgewater-Raritan Cor poration’s 50th anniversary event during the company’s National Middle School to encourage children to develop STEM skills. The event Business Meeting in early September 2019. There was no better way culminated with a representative from the school thanking Hamamatsu to commemorate our 50th anniversary than with the for the meaningful donation and raising awareness Japanese tradi tion of Kagami Biraki. for STEM with local students. Instead of being taught Kagami Biraki is a ceremony which literally translates by someone, see it with your As our 50th anniversary celebration ended, we look to “opening the mirror”, and serves as a symbol for “own eyes, listen to it with your forward to continuing our research and development opening or breaking into the future. This 300-year- through collaborations with colleagues and univer si ties own ears, understand it with old traditional ceremony is still performed in Japan at to create cutting edge technologies and inno vations significant events worthy of being celebrated to wish your own heart. that will provide exceptional quality and service to good health and fortune in the future. What we do not know and our customers. what we cannot do is After the breaking of the sake barrel, employees At Hamamatsu Photonics, we not only dream of con- an infinite dimension we toasted with sake, marking the transition to a new tri buting to our society through the use of light; we stage as we forge our path to the next 50 years must now explore.
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