A polarizer produces linearly polarized light.  It is often convenient to orient the transmission axis of a polarizer vertically or horizontally to produce light with vertical or horizontal linear polarization.

There are different polarization mechanisms.  The most common method of producing polarized light is to use polaroid material, made from chains of organic molecules, which are anisotropic in shape.  Light transmitted is linearly polarized perpendicular to the direction of the chains.  The transmission axis is perpendicular to the chains.

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When unpolarized light is incident on a boundary between two dielectric surfaces, for example on an air-water boundary, then the reflected and transmitted components are partially polarized.  The reflected wave is 100% linearly polarized when the incident angle is equal to an angle called the Brewster angle.  For water this angle is is ~53o with respect to the normal or 37o with respect to the water surface. For are considerable angular range around the Brewster angle the reflected light is highly polarized in the horizontal direction.

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Alvium SWIR cameras support a spectral range from 400 nm to 1700 nm at high quantum efficiencies. This allows you to capture images in both the visible and SWIR spectra with  a single camera and enables users to reduce overall system costs!

With their SWaP+C properties, Alvium SWIR cameras are ideal for building cost-effective OEM systems in the field of embedded and machine vision. Thereby, industrial-grade Alvium SWIR cameras and related drivers offer you a plug-and-play feeling when setting up your system solution.

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An ideal polarizer is a material that passes only EM waves for which the electric field vector is parallel to its transmission axis.  The electric field is a vector and can be written in terms of the components parallel and perpendicular to the polarizer's transmission axis.  E = Eparallel + Eperpendicular.  An ideal polarizer passes Eparallel and absorbs Eperpendicular.If E0 is the incident field vector and the angle between E0 and the transmission axis is θ, then the magnitude of transmitted field vector is E0 cosθ and its direction is the direction of the transmission axis.  The intensity I of an electromagnetic wave is proportional to the square of the magnitude of the electric field vector.  We therefore haveItransmitted = I0 cos2θ. This is called the law of Malus.  If θ = 90o the transmitted intensity is zero.

Certain birefringent crystalline substances bend light trough an angle that depends upon the state of incident polarization.  The have an optic axis.  Unpolarized light entering a birefringent crystal not along the optic axis of the crystal is split into beams which are bend by different amounts.

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Sensor Model: Sony IMX992 SenSWIR Resolution: 2592 (H) x 2056 (V), 5.3 MPFrame Rate: 84/77/84 fpsPixel Size: 3.45 μmOptical format: Type 1/1.4Weight: 15 g (bare board), 50 g (open housing), 100 g (closed housing)

Sensor Model: Sony IMX993 SenSWIRResolution: 2080 (H) x 1544 (V), 3.2 MPFrame Rate: 131/125/131 fpsPixel Size: 3.45 μmOptical format: Type 1/1.8Weight: 15 g (bare board), 50 g (open housing), 100 g (closed housing)

Some materials turn birefringent when stressed.  By placing transparent materials between two polarizers, we can perform stress analysis tests.

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Thanks to the innovative 2nd generation Sony SenSWIR InGaAs sensors Alvium SWIR cameras deliver high resolutions up to 5.3 MP at fast frame rates. At the same time, the small pixel size of only 3.45 µm unprecedented for SWIR sensors, is ideal for capturing smallest details. In combination with a high-precision sensor alignment at production time, you can realize inspection systems supporting highest requirements regarding image quality, resolution, and precision.

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When the sun is at a low angle in the sky, the sunlight reflecting off the surface of water is nearly 100% horizontally polarized because the angle of incidence is close to the Brewster angle. Glare-reducing sunglasses are coated with a polarizer with a vertical transmission axis and therefore block the reflected light.

Polarization is a phenomenon peculiar to transverse waves.  Longitudinal waves such as sound cannot be polarized.  Light and other electromagnetic waves are transverse waves made up of mutually perpendicular, fluctuating electric and magnetic fields.  In the diagram below an EM wave is propagating in the x-direction, the electric field oscillates in the xy-plane, and the magnetic field oscillates in the xz-plane.  A line traces out the electric field vector as the wave propagates.

Optically active or circular birefringent materials rotate the direction of polarization of linearly polarized light.  The amount of rotation depends on the wavelength of the light.  Sugar molecules have a handedness (chirality) and in solution are optically active.  If we polarize white light and pass it through sugar syrup, the direction of polarization of the light emerging from the syrup will be different for the different color components.  If the light then passes through a second polarizer, its color changes with the orientation of the transmission axis of this polarizer.

Equipped with Sony's IMX992 and IMX993 SenSWIR InGaAs sensors, Alvium SWIR (short wave infrared) cameras deliver high resolution images at fast frame rates in a design offering small size, light weight, and low power consumption, including low cost (SWaP+C).

When unpolarized light passes through a polarizer, the intensity is reduced by a factor of ½.  The average of cos2θ, averages over all angles θ is ½. Itransmitted = I0all angles = ½I0.

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For a linearly polarized electromagnetic wave traveling in the x-direction, the angle the electric field makes with the y-axis is unique.

A beam of unpolarized light of intensity I0 passes through a series of ideal polarizing filters with their transmission axis turned to various angles, as shown in the figure. (a)  What is the light intensity (in terms of I0) in regions A, B, and C? (b)  If we remove the middle filter, what will be the light intensity at point C?

An unpolarized electromagnetic wave traveling in the x-direction is a superposition of many waves.  For each of these waves the electric field vector is perpendicular to the x-axis, but the angle it makes with the y-axis is different for different waves.  For unpolarized light traveling in the x-direction Ey and Ez are randomly varying on a timescale that is much shorter than that needed for observation.

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