IR Windows-Infrared Windows Assemblies for Thermal Imaging Inspection

Inspection is necessary for high power and high voltage electric installations to avoid the possible accident, the thermal imagine is found to be the optimal and effective way for this application. In some countries, thermal imagine inspections is compulsory for accident insurance. And in some industrial equipment likethe high temperature metallurgic oven, it is necessary to use the thermal imagine to watch its temperature inside. An infrared windows assembly is needed to be installed on the housing of the electric and industrial equipment as the viewport windows for thermal image camera.

Features

Applications
High power and high voltage electric installations, switch cabinet;
High temperature metallurgic oven;
Mineral and petroleum industry.

Design and standard
The windows assembly consists of metal flange, crystals windows and metal protective cover;
The protective cover is fixed by two small magnet nubs;
The whole windows is fixed on the cabinet house by the flange, no screw is needed;
Various types of infrared crystals is available: CaF2; BaF2; Germanium; Sapphire; Silicon; ZnS; ZnSe;
Confirm to the dust tight standard IP67 of NF EN6052.

Materials Used 
Flange Metal
Housing or Cover Metal Materials
Optics CaF2, BaF2, Ge, Sapphire, silicon, ZnSe, ZnS windows
Cover fixing Fixed by Magnet nub
Water and dust ingress IP67 of NF EN60529
Typical Dimensions 
Models Body Diameter Crystals Diameter Viewing Diameter Assembly Thickness
SHIRW-60 84 mm 60mm 55mm 22mm
SHIRW-75 99 mm 75mm 70mm 22mm
SHIRW-100 124 mm 100mm 95mm 22mm

Application notes
Installation steps
Step 1: Calculate and decide the position where the windows would be installed according to the view angle of the thermal imagine camera;
Step 2: Drill a hole according to the size of the windows assemblies;
Step 3: Install the whole windows assemblies;
Step 4: Open the protective cover and make the testing of the inspection.
Select the suitable crystals materials for your applications:
Several factors you should take into consideration during the selection of crystals materials: Wavelength range, environment (temperature, humidity and vibration ect.) and cost. Here is the specification of the materials for your reference.

 

Hangzhou Shalom EO (or Hangzhou Shalom Electro-optics Technology Co., Ltd.)

Hangzhou Shalom EO (or Hangzhou Shalom Electro-optics Technology Co., Ltd.) is a supplier of crystals, optics and components used in lasers, thermal imaging and scintillation applications since 2010. Most products are custom-made for your special needs.

The products are widely used in the laser systems and instruments, thermal imaging cameras and applications, X-ray equipment, nuclear ray detecting instruments, medical and biological equipment, automation and precision instruments in field of industry, military, scientific research and aerospace.
Hangzhou Shalom scintillation crystals
Here are the products of Shalom EO:
Laser components
Laser crystals (Nd: YAG, Nd: YVO4, Er: YAG, Cr: YAG, CTH: YAG, diffusion bonding crystals, Ti: Sapphire, etc.); Laser optics; Pockels cells and crystals; passive Q-switched crystals; Laser polarizers and wave plates.

Thermal imaging optics
IR lenses for uncooled and cooled thermal imaging cameras, IR windows (Ge, Si, ZnSe, ZnS, CaF2, BaF2), IR optics;
Hangzhou Shalom thermal imaging
Scintillators
Scintillation crystals (NaI Tl, CsI Tl, LYSO Ce, BGO, Ce: YAG, CdWO4, LaBr3 Ce, CeBr3, LaCl3 Ce, etc.), plastic scintillators, Tl) scintillators, NaI (Tl) detectors and NaI (Tl) probes.

Optics, wafers and crystals
Sapphire optics, SAW wafers and crystals, optical grade LiNbO3, LiTaO3, crystalline substrates, optics, filters, filters / waveguides for IPL equipment.

Crystal Optical Research

The study of the propagation of light, and associated phenomena, in crystalline solids. For a simple cubic crystal the atomicarrangement is such that in each direction through the crystal the crystal presents the same optical appearance. The atomsin anisotropic crystals are closer together in some planes through the material than in others. In anisotropic crystals theoptical characteristics are different in different directions. In classical physics the progress of an electromagnetic wavethrough a material involves the periodic displacement of electrons. In anisotropic substances the forces resisting thesedisplacements depend on the displacement direction. Thus the velocity of a light wave is different in different directions andfor different states of polarization. The absorption of the wave may also be different in different directions. See Dichroism, Trichroism

In an isotropic medium the light from a point source spreads out in a spherical shell. The light from a point source embeddedin an anisotropic crystal spreads out in two wave surfaces, one of which travels at a faster rate than the other. Thepolarization of the light varies from point to point over each wave surface, and in any particular direction from the source thepolarization of the two surfaces is opposite. The characteristics of these surfaces can be determined experimentally bymaking measurements on a given crystal.

In the most general case of a transparent anisotropic medium, the dielectric constant is different along each of threeorthogonal axes. This means that when the light vector is oriented along each direction, the velocity of light is different. Onemethod for calculating the behavior of a transparent anisotropic material is through the use of the index ellipsoid, also calledthe reciprocal ellipsoid, optical indicatrix, or ellipsoid of wave normals. This is the surface obtained by plotting the value ofthe refractive index in each principal direction for a linearly polarized light vector lying in that direction (see illustration). Thedifferent indices of refraction, or wave velocities associated with a given propagation direction, are then given by sectionsthrough the origin of the coordinates in which the index ellipsoid is drawn. These sections are ellipses, and the major andminor axes of the ellipse represent the fast and slow axes for light proceeding along the normal to the plane of the ellipse.The length of the axes represents the refractive indices for the fast and slow wave, respectively. The most asymmetric typeof ellipsoid has three unequal axes. It is a general rule in crystallography that no property of a crystal will have lesssymmetry than the class in which the crystal belongs.

Optics,Wafers and Crystals

Characteristics of plastic scintillator

Plastic scintillators belong to organic scintillators, but not organic crystal scintillators. It can be used for the detection of alpha, beta, gamma, fast neutrons, protons, cosmic rays and fission fragments. It is easy to transparent body into very large, easy processing into various shapes, with no deliquescence, stable performance, radiation resistance, short decay time and flashing advantages of low price, is a kind of scintillator is widely used today.

Characteristic
A, simple in production, low in price, easy to process into various shapes, such as column, piece, ring, rectangle, well shape, tube, film, filaments, particles and so on.

B, high transparency, good light transmission performance, can be made into large volume scintillator.

C, scintillation attenuation time is short, suitable for nanosecond time measurement and high intensity radiation measurement.

D, stable performance, high mechanical strength, vibration resistance, impact resistance, moisture resistance, no need for encapsulation, light saving 8~10a luminescence efficiency has no obvious change.

E, radiation resistance in various scintillator first, can be used for high radiation field emission, high exposure rate.

F, softening temperature is low, can not be used under high temperature conditions.

G, soluble in aromatic ketones and solvent, ethanol, dilute acid, dilute alkali and very little impact on it.

H, poor energy resolution, generally only for strength measurement

Optical and Laser Components

Optical and Laser Components

1. Flowtubes, Monoblocks and Specular Reflectors for Lamp- and Diode-based Pump Chambers.

Flowtubes and Monoblocks are an essential component of the flashlamp-pumped pump chambers; they carry out the following functions:

– Provide flow-channel for cooling liquid;

– Absorb (filter-out) undesired UV-radiation, reducing heat load, thermal lensing effect and protesting the active medium from long-term solarization;

– Provide internal support for BaSO4 reflectors;

– Blocking lateral stimulated emission, which can depopulate the laser rod and significantly reduce amount of the extracted energy in Q-switched mode. For the Q-switched Nd:YAG Laser Samarium-doped Glass is the material of choice, because it attenuates lateral depumping effects, thus avoiding super luminescence phenomena and absorbing undesired UV radiation.

Cerium Glass and Europium Quartz Glass are also interesting doping materials, because they absorb undesired UV-radiation and can additionally re-emit this energy in the useful spectral range. For free-running lasers, Duran and Quartz Glass are the materials of choice for fabricating the flowtubes, while undoped-YAG and Sapphire can also be used when harsh conditions warrant.

Flowtubes and monoblocks are machined out of a block of glass with highly polished interior and exterior surfaces. The channels containing the laser rod and flashlamps are deep-bored with tight control of dimensions and tolerances on parallelism and perpendicularity. In case of Sm- or Eu-doped glass, the monoblocks are subjected to ion-exchange strengthening in accordance with instructions of glass manufacturer.

All shapes and configurations of monoblocks are available including multi-channel cylindrical, ellipsoid, shotgun, etc. sections with flat or indented end-surfaces for reliable sealing. Please contact us with your specific requirements.

The monoblocks can be used as part of diffuse pump chambers with BaSO4 reflectors. In addition, the polished exterior cylindrical or elliptical surfaces can be coated with Cu/Ni-protected Silver or Gold coating to form the high efficiency Specular Reflector, with some standard configurations available on a short notice.

Presence of strong thermo-optical effects in high power diode pumped lasers presents a challenge in obtaining high output power with low-order modes. In various Nd:YAG laser configurations like rod, slab or disk lasers thermally-induced refractive index changes lead to lensing, aberrations and birefringence. For power scaling of diode pumped solid state lasers the uniform pumping configuration and effective thermal management are required.

For better pumping and cooling management of diode-pumped solid-state lasers, our preferred vendor has developed a range of state of the art Sapphire and Fused Silica reflector flowtubes for axial uniform pumping. The barrel surface of flowtubes is coated by Cu/Ni-protected, highly reflective Gold layer. For uniform distribution of laser diodes pumping radiation within laser rod, multiple configurations of flowtubes have been developed. Due to high manufacturing precision combined with innovative know-how, these reflectors demonstrated reduced thermally-induced effects of lensing and aberration, and improved output power and optical-to-optical efficiency of the laser.

IR Lenses-Thermal Imaging Cameras

IR Lenses are used to collect, focus, or collimate light in the near-infrared, short-wave infrared, mid-wave infrared, or long-wave infrared spectra. IR Lenses are optical lenses that use specific substrates or anti-reflection coatings to maximize performance for applications operating above 700nm including thermal imaging, FLIR, or spectroscopy. The infrared spectrum refers to 700 – 16000nm wavelengths. When divided into smaller spectra, NIR refers to 700 – 900nm, SWIR is 900 – 2300nm, MWIR is 3000 – 5000nm, and LWIR includes 8000 – 12000nm wavelengths.

Edmund Optics offers a large variety of IR Lenses including singlet lenses, achromatic lenses, aspheric lenses, or focusing objectives for high performance across a large portion of the infrared spectrum. IR Achromatic Lenses are ideal for use in a variety of industrial, life sciences, or defense applications including FTIR spectroscopy or for use with tunable QCL lasers. Zinc Selenide IR Aspheric Lenses feature diffraction limited designs that are ideal for focusing the output of CO2 lasers. Additional substrates include germanium, sapphire, silicon, zinc selenide, or zinc sulfide. Anti-reflection coating options include VIS-NIR, NIR I, NIR II, Telecom-NIR, or SWIR.

Thermal Imaging-IR Lenses

Round Thin Film Laser Polarizers

  • Provide the achievement of strictly linear polarization of laser radiaton
  • Utilize the polarization wich occurs on reflection from a plane surface
  • Rs/Tp:>99.5/95.0% for standard thin film polarizers
  • Rs/Tp:>99.5/99.0% for high transmittance thin film laser polarizers
  • Ts<0.2%, Rp<0.2% for ultra high transmission thin film polarizers
  • Tp>98%, Ts<0.1% for thin film polarizers with high extinction ratio
  • High damage threshold reaching 10 J/cm2
  • Extinction ratio 200:1 (for standard, high and ultra high transmission thin film polarizers), 1000:1 (for thin film laser  polarizers with high extinction ratio)

Thin Film Laser Polarizers separate the s- and p-polarization components. They are designed for use in high energy lasers. Due to high damage threshold, reaching 10 J/cm2 @ 1064 nm 8 ns, Thin Film Polarizers are used as an alternative to Glan Laser Polarizing Prisms or Cube Polarizing Beamsplitters.

Typical applications are intracavity Q-switch hold-off polarizer or extracavity attenuator for Nd:YAG lasers.

Thin Film Polarizers can be used at an > 40° angle of incidence, but polarization is most efficient and appears in a broad wavelength range at 56° AOI (Brewster angle). Typical polarization ratio Tp/Ts is 200:1.

Standard size is up to Ø50 mm (2”), while max. available dimensions are 100×200 mm. For optimal transmission a Thin Film Polarizer should be mounted in an appropriate holder for angular adjustment. For Rectangular Thin Film Polarizers, visit here.

This article comes from eksma edit released