HOFME optical measuring machines are conceived to minimize those risks, improving efficiency and productivity directly on the production floor.

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Overall, with the use of liquid lenses, one achieves more freedom due to the variability of the working distance and the possibility of very fast and precise focus adjustment.

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If the distance of the object to the liquid lens changes, the liquid lens technology allows the object to be tracked in space by permanent and instantaneous focusing. The object is thus in focus at any working distance.

Illuminance (E) is defined as the luminous flux (Φ) incident on a surface (A) (see formula 1). The luminous flux (Φ) emitted by a light source in this direction is the product of luminous intensity (I) and the solid angle (Ω)(see formula 2). The solid angle (Ω) can be determined from the quotient of the illuminated surface (A) and the square of the distance (r) to the light source (see formula 3).

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There, the barcode reader is usually permanently installed and the objects to be measured move quickly under the reader. An example of this are packages, which can have different sizes. In order to be able to read the barcodes on the packages, it is essential that the images of the codes are focused very quickly. Only sharp images can be evaluated reliably during production.

The photometric law of distance describes the relationship between the illuminance and the distance of the measuring plane to the light source. Illuminance recedes with the square of the distance from the light source.A1 = Ω x r2A2 = Ω x (2 x r2)2 = 4 x R x r2 = 4 x A1

The photometric law of distance states that the illuminance decreases with the square of the distance between the light source and the illuminated surface. This means: if the distance between the light source and illuminated surface is doubled, four times the luminous intensity is needed for the same illuminance.

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OPT's newly developed liquid lens features a precision design with no moving parts, is small and compact, and can be used in miniaturized or space-constrained automation equipment.

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202263 — Focal length is the distance measured in millimeters, between the optical center of the lens and the camera sensor, where the light information is recorded.

To meet customers´ needs for improving quality and efficiency, OPT's self-developed liquid lens has been newly launched. Under combined applications with smart code readers and industrial cameras, it exhibits outstanding performance, achieving instantaneous focusing and offering more flexibility in working distance. They are thus ideally suited for the 3C industry (computers, communications and consumer electronics), logistics and many other industries.

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The model for liquid lenses are biological eyes, such as those of humans. In a fluid-filled chamber, an elastic lens is deformed by muscle force (ciliary muscle) to achieve focusing.

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Most applications for liquid lenses are found where codes need to be read quickly, but the codes may be present at different working distances. This can be the case in logistics and especially in applications on conveyor belts.

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Conventional autofocus lenses are considerably slower and the wear on the mechanics is considerable. For this reason, they are reluctantly used in machine vision.

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An example of a vision inspection system is Cognex In-Sight, widely used for product inspections, defect detection, and quality control in manufacturing and ...

The Diffused Dome Light provides intense, evenly diffused illumination. Ideal for highly specular applications, curved objects, metalic material (aluminum, ...

The most significant advantage of liquid lenses is the fast focusing without mechanical wear. Working distances or focal lengths can be reliably changed within a few milliseconds. The control is electrical.

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Not only barcode readers and intelligent cameras can be equipped with liquid lenses, but also conventional industrial cameras.

Another advantage of liquid lenses is that they can be particularly compact. This means that code readers and intelligent cameras can be made even smaller.

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OPT's liquid lenses use the principle of two-phase liquid lens technology. Two immiscible liquids (an aqueous salt solution and a non-conductive oil) with different refractive indices are contained in a chamber. If an electrical voltage is now applied, the shape and curvature of a liquid is influenced and thus also the focal length of the entire liquid lens.

In applications where several images are taken in quick succession as test shots with different settings, the use of liquid lenses can lead to faster results. In addition, the number of images captured can be significantly reduced.

It can be easily and flexibly installed and commissioned, thus best meeting the requirements of complex machine vision applications.

If, in a first step, the luminous flux from formula 1 is replaced by the product of luminous intensity and solid angle, and then the solid angle is replaced by the quotient of the illuminated area and the square of the distance, the illuminance is obtained as a function of the distance to the light source (see formula 4).

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