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용어 정리

Back Flange Distance

The distance from the front of the camera's lens mounting flange to the sensor plane (image distance).

  See also CS-Mount , C-Mount

Back Focal Length (BFL)

광학 렌즈의 맨 끝에 위치한 광학면(optical surface)부터 상이 맺히는 면(image plane)까지의 거리를 측정한 값.

Back Light Compensation

An automatic function in cameras that gives higher photometric weight to objects in the center of the field of view than to those in the periphery. It increases local contrast to help avoid silhouetting.

Backlash

The amount of play (lost motion) between a set of moveable parts when changing the direction of travel.

Ball Bearing Slide

A type of positioning component comprised of a stationary base with a mobile carriage riding on top. Two rows of hardened steel balls on both sides of the base provide the smooth, accurate, low friction sliding motion between the stationary base and the top slide.

Ball Bearing Stage

A type of positioning component comprised of a precision linear ball slide which serves as a linear bearing and guide, and a drive mechanism which accurately moves and positions the slide top along the linear axis. They provide controlled, precise point-to-point positioning along a linear axis.

Ball Lens

A perfectly spherical optical component often used for improving signal coupling between fibers, emitters and detectors.

  See also Optical Fiber , Sphericity

Bandwidth

Also referred to as passband or bandpass, a wavelength range used to denote a specific part of the spectrum that passes incident energy through a filter. The first order is always at the design wavelength of the filter.

Bayer Filter

이미징 센서 위에 위치하는 color filter array로서 알고리즘 판독 시 컬러 이미지를 생산할 수 있게 해줍니다.

BBAR Coating

광대역 비반사 코팅(Broad Band Anti-Reflection coating)으로서, 넓은 파장 범위에 걸쳐 반사를 감소시켜줍니다.

Beam Diameter

The calculated distance between two exactly opposed points on a beam at a chosen fraction of peak power (typically 1/e2). It is also defined as the diameter of a circular aperture that will pass a specified percentage (usually 90%) of the total beam energy.

Beam Divergence

전파하는 빛의 단면적이 증가하는 것으로, 이러한 빛은 완벽하게 시준 되지 않습니다.

Beam Expander

A component commonly used with lasers to increase the beam diameter. One advantage is that expanding a beam will decrease divergence by the expansion factor. The decreased divergence is a major advantage for long distance applications despite the initial increase in beam diameter. For example, a 1mm laser beam expanded 10X will be 10mm in diameter and will have one tenth the divergence of the original beam.

Beam Width

The angular width of a beam. With respect to a conical beam of light, it is the vertex angle of the cone. The beam width is a measure of the rate of divergence or convergence of a light beam.

Beamsplitter

An optical component designed to separate collimated light into a specific ratio of transmissions. Examples include a variety of cube beamsplitters and plate beamsplitters.

Bend Radius

In an optical fiber, the minimum radius the fiber can be bent before introducing damages to either the core or the cladding.

  See also Optical Fiber , Cladding

Bevel

A slanted edge (chamfer) ground into the side of a lens, mirror, prism, or window; it is used to prevent chipping or sharp edges.

Bezel

A rim designed to hold a lens or other component. Many lasers and laser diode modules have an optional mounting bezel to allow them to accept 1"-32 TPI components such as line generators or beam expanders. Mounting Bezels can also adapt the laser for use with C-Mount Integrated Mounting Components.

Binning

이미지 센서 상의 인접 픽셀을 하나의 대형 유효 픽셀로 전환하는 signal의 역학적 합(sum)으로서, sensitivity는 증가시켜주고 resolution은 낮춰줍니다.

  See also Pixel

Birefringence

The phenomenon of double refraction in crystalline materials. Birefringent materials have slightly different indices of refraction for light that is polarized in different orientations. They will separate incident unpolarized light into its parallel and orthogonal components.

Blaze Angle

The angle between the longer leg of the sawtooth profile of a grating and the plane of its surface (as if it were polished flat). The wavelength of peak efficiency is generally referred to as the blaze wavelength. The efficiency of a grating into a desired order can be maximized by altering the blaze angle.

Blaze Wavelength

The wavelength of peak grating efficiency based upon the blaze angle. The maximum efficiency occurs when the incident angle from the blaze normal and diffracted rays from the blaze normal are equal (Littrow configuration). Using the grating equation, it is easy to determine the appropriate blaze angle for a specific peak efficiency (blaze wavelength) or determine the blaze wavelength from the blaze angle.

Blocking

The amount of light that is rejected, not passed, by a filter outside the passband. Expressed as the ratio of total energy transmitted outside the passband to the total energy transmitted within the passband. Blocking values are given over a specified wavelength range.

Blocking Range

Also referred to as stopband, a wavelength interval used to denote a spectral region of energy that is not transmitted by a filter. It is typically specified in terms of Optical Density (OD).

Blooming

CCD의 과포화된 픽셀이 인접 픽셀들로 확산되는 현상으로 휘도가 높은 대형 스팟(점)/스트리크(줄무늬)가 이미지에 나타나게 됩니다. 노출 시간을 줄이거나 조명의 밝기를 감소시키면 이러한 blooming을 방지할 수 있습니다.

Board-Level Camera

PC 보드에 장착되어 있는 센서로 이루어진 카메라의 한 종류로서, 기기의 특정 끝단에 연결되어 있지 않습니다. 사용자 통합 용도로 설계됨.

Bolt Circle (BC)

The circular line containing the center of holes about a common center in mechanical components such as bases and mounts.

Bore Sighting

Beam alignment for a laser is a mechanical specification that measures how well the optical axis coincides with the mechanical axis of the laser (usually expressed as an angle). It is often critical to know the alignment of the beam output to the mechanical housing of a laser for alignment or sighting applications.

Borescope (산업용 내시경)

일반적으로 길고 좁은 튜브 형태의 광학 기기로서 빈 공간이나 닿기 어려운 기계 부품의 내부를 검사할 수 있게 해줍니다.

  See also Fiberscope

Breakdown Voltage (BDV)

The point at which the detector begins to behave as a conductor. Operating a photodiode at or above its breakdown voltage will damage the device.

  See also Photodiode , Amplifiers

Brightfield Illumination

렌즈로 모이는 빛의 대부분이 피사체에서 반사되도록 하는 조명 기법. 표면에 결함이 있는 부분들은 high-contrast dark spot으로 보이게 됩니다.

Buffer Material

In reference to optical fibers, extra material to protect the core and cladding material within the component.

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