Zinc selenide is a commonly used optical glass material in the infrared band with a transmission band of 600nm-16μm. It has low absorption and thermal shock resistance, and is commonly used in thermal imaging systems, as well as in some visible optical systems, and can be used as a substrate for a variety of optical components. Zinc selenide (ZnSe) plano-convex (PCX) lenses are mainly used for focusing or collimating applications in the mid-wave and long-wave infrared spectra. ZnSe PCX lenses focus light into a single point and are commonly used for aiming and focusing monochromatic light sources.
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It is important to note that zinc selenide is a toxic material, so please wear gloves when using it and wash your hands afterwards.
Our company offer ZnSe plano-convex lenses in various sizes and focal lengths.
Plano-convex lens is a positive lens that is used in optical systems for beam expansion, image formation, beam collimation, focus collimation, beam collimation point source, and other applications. Plano-convex lens is convex on one side and flat on the other and has a positive focal length, and is often used for applications related to beam reduction, focal length reduction, or image magnification.
The important parameters of a plano-convex lens are: size, focal length, design wavelength, finish, face accuracy, eccentricity, substrate material and other attributes. Suitable parameters of plano-convex lenses can be selected according to specific applications.
Zinc selenide is a yellow transparent polycrystalline material with a crystalline particle size of about 70 μm and a light transmission range of 0.5-15 μm.Zinc selenide synthesized by chemical vapor deposition (CVD) is basically free of impurity absorption and has very low scattering loss.Due to the low absorption of 10.6 μm wavelength light, zinc selenide is the material of choice for making optics in high power CO2 laser systems. In addition, it is a commonly used material in various optical systems in its entire transmission band.It is also used to make total reflector, semi-reflector, beam expander, flat field lens, mid-infrared lens and far-infrared 10.6μm CO2 power laser with various plano-convex lens, convex-concave crescent cut lens, gold-plated reflector, circular polarizer, beam expander, flat field lens, etc.
CVD zinc selenide is characterized by high purity, high capability of environment and easy processing. The material has excellent uniformity and consistency and is suitable for CO2 laser and infrared thermal imaging systems.
Coating refers to coating a transparent electrolyte film or metal film on the surface of the substrate material by physical or chemical methods. The purpose is to change the reflection and transmission characteristics of the material surface to reduce or increase the reflection, beam splitting, color separation, light filtering, polarization and other requirements.We can provide various optical coatings such as anti-reflective films, high-reflective films, spectral films, and metallic films. Broadband anti-reflective films are available for UV, visible, NIR and mid-infrared wavelengths.
Zinc selenide is a substance synthesized from 5N hydrogen selenide and 5N zinc by chemical vapor deposition (CVD), and the synthesis method itself is a purification process.
Monocrystalline
●There are no visible grain boundaries or wicker-like stripes on the crystal surface when examined under naked eye daylight.
Sub-crystal
●When examined under naked-eye daylight, there are willow stripes on the surface of the crystal with an area < 1/6 (end diameter), and the willow stripes are not visible after polishing .
Polycrystalline
●When examined under naked-eye daylight, there are penetrating crystal boundary lines on the surface of the crystal, and the difference in the degree of light and darkness between the two sides of the crystal boundary lines is obvious.
●N-BK7
N-BK7 is the most commonly used optical glass for processing high quality optical components,, with excellent transmittance from visible to near-infrared wavelengths(350-nm), and has a wide range of applications in telescopes, lasers and other fields. N-BK7 is generally chosen when the additional benefits of UV fused silica (very good transmittance and low coefficient of thermal expansion in the UV band) are not required.
●UV fused silica
UV fused silica has a high transmission from the UV to NIR (185-nm). In addition, UV fused silica has better uniformity and lower coefficient of thermal expansion than H-K9L (N-BK7), making it particularly suitable for high power laser and imaging applications.
●Calcium fluoride
Due to its high transmittance and low refractive index within a wavelength of 180nm-8um, calcium fluoride is often used as windows and lenses in spectrometers and thermal imaging systems. In addition, it has good applications in excimer lasers because of its high laser damage threshold.
●Barium fluoride
Barium fluoride have high transmittance from the 200nm-11um and they are resistant to stronger high-energy radiation. At the same time, barium fluoride has excellent scintillation properties and can be made into various infrared and ultraviolet optical components. However, the disadvantage of barium fluoride is that it is less resistant to water. When exposed to water, the performance degrades significantly at 500℃, but it can be used for applications up to 800℃ in a dry environment. At the same time, barium fluoride has excellent scintillation properties and can be made into various infrared and ultraviolet optical components.It should be noted that when handling barium fluoride material, gloves must be worn at all times and hands must be washed thoroughly after handling.
●Magnesium fluoride
Magnesium fluoride is ideal for applications in the wavelength range of 200nm-6um. Compared to other materials, magnesium fluoride is particularly durable in the deep UV and far IR wavelength ranges. Magnesium fluoride is a powerful material for resistance to chemical corrosion, laser damage, mechanical shock and thermal shock. It is harder than calcium fluoride crystals, but relatively soft compared to fused silica, and has a slight hydrolysis. It has a Nucleus hardness of 415 and a refractive index of 1.38.
●Zinc selenide
Zinc selenide has high transmittance in the 600nm-16um and is commonly used in thermal imaging, infrared imaging, and medical systems. Also, due to its low absorption, zinc selenide is particularly suitable for use in high-power CO2 lasers. It should be noted that zinc selenide is a relatively soft material (Nucleus hardness 120) and is easily scratched, so it is not recommended for use in harsh environments. Extra care should be taken when holding, and cleaning, pinching or wiping with even force, and it is best to wear gloves or rubber finger covers to prevent tarnishing. Cannot be held with tweezers or other tools.
●Silicon
Silicon is suitable for use in the NIR band from 1.2-8um.Because of its low
density, silicon is particularly suitable in applications where weight
requirements are sensitive, especially in the 3-5um . Silicon has a Nucleus
hardness of , which is harder than germanium and not as fragile as
germanium.It is not suitable for transmission applications in CO2 lasers
because of its strong absorption band at 9um.
●Germanium
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Germanium is suitable for use in the near-infrared band of 2-16um and is well
suited for infrared lasers. Due to its high refractive index, minimal surface
curvature and low chromatic aberration, germanium does not usually require
correction in low power imaging systems. However, germanium is more
severely affected by temperature, and the transmittance decreases with
increasing temperature; therefore, it can only be applied below 100°C. The
density of germanium (5.33 g/cm³) is taken into account when designing
systems with strict weight requirements. Germanium lenses feature a
precision diamond lathe turned surface, a feature that makes them well suited
for a variety of infrared applications, including thermal imaging systems,
infrared beam splitters, telemetry, and in the forward-looking infrared (FLIR)
field.
●CVD ZnS
CVD ZnS is the only infrared optical material, other than diamond, that covers visible to long-wave infrared (LWIR), full wavelength and even microwave wavelengths, and is currently the most important LWIR window material. It can be used as windows and lenses for high-resolution thermal imaging systems, as well as for advanced military applications such as "tri-optical" windows and near-infrared laser/dual-color infrared composite windows.
Hello Scott,
We have not worked on a solution internally to create a narrower field of view for the TMP006. It would not be easy to achieve a 5 degree field of view without a very custom lensing solution. A simple aperture to reduce the field of view down to 5 degrees would likely reduce the signal-to-noise ratio too much to be able to achieve accurate results. Creating an aperture also requires the designer to thermally short the aperture material to the die (GND pin) of the TMP006 so the aperture does not interfere with the measurements. If the aperture is at a different temperature than the TMP006, all the TMP006 will read is the aperture temperature.
Regarding your second question, the datasheet specifies the temperature accuracy with the ambient temperature (Tdie) between 20C and 60C and the object temperature (Tobj) within (Tdie - 10C) to (Tdie+30C). So if the ambient temperature remains constant, the specification only allows for a 40C change in object temperature. The gain, offset, and calibration equations would have to be re-characterized to optimize the part for different ranges which we currently do not have plans to do.
Regards,
Collin Wells
Precision Analog
Scott;
A narrow field of view can be obtained by placing a lens in front of the active area of a sensor. In light of the wavelength responsivity of this device (4um to 8um-- this information SHOULD HAVE BEEN PUT IN THE DATA SHEET!) a lens with a material that is transparent in this range will be required.
There are materials which do this quite nicely-- Calcium Fluoride, for one (CaF2), but that is probably going to be expensive. A Fresnel lens made of a plastic material will probably be far cheaper. Although there are lenses made with high-density polyethylene, other plastics with better optical properties do exist. See this site: http://www.fresneltech.com/materials.html
Another interesting possibility arises due to the fact that this TI device is sensitive both front and back. Placing the TMP006 in the focal plane of a parabolic mirror-- either prime focus or Cassegrain-- would allow you to illuminate one side of the package with the mirror while the other is illuminated by the lens. Weird idea but it might work :)
Thanks Neil neat idea!
Other than Polyethylene, Polypropylene, CaF2, and "Poly IR" materials, other options are for the 4-8um wavelengths are: Sapphire, Silicon, Germanium, and Zinc Selenide.
However the cost of these materials besides polyethylene, polypropylene, and Poly-IR materials, may be too high to make sense for use with a solution like the TMP006.
If you are able to achieve success with a lens, we'd love to hear about it.
Best of luck,
Collin Wells
Precision Analog
Yes, correct on all fronts!
I should have attached the images below to the last post but didn't. See below for a full summary of the % of IR transmission for the materials listed in my previous post. Germaninum and Zinc Selenide pass IR wavelengths but their refraction index is too high to achieve good transmission. Therefore both Ge and ZnSe require anti-reflective (AR) coating to achieve good results in mid-IR. The TMP006 already has a silicon "lens" due to the physical construction of the device so we know it works as well. Si suffers from high index of refraction as well and we actually lose roughly half of our signal due to refraction (this is corrected for internally), so an AR coating would be required for a proper silicon lens as well.
Spectral Transmission of TMP006:
CaF2:
Ge:
Poly-Ethylene:
Poly-Propylene:
Sapphire:
Si:
ZnSe:
Regards,
Collin
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