FOV and focal length

The measuring system of Avantier MTF accommodates MTF measurements at a single wavelength or within a spectral range covering a finite band of wavelengths, providing monochromatic or polychromatic MTF values, respectively. This flexibility ensures accurate assessments of image quality across different optical systems and under varying conditions.

BK 7 is one of the most common borosilicate crown glasses used for visible and near infrared optics. Its high homogeneity, low bubble and inclusion content, and straightforward manufacturability make it a good choice for transmissive optics. BK7 is also relatively hard and shows good scratch resistance. The transmission range for BK 7 is 380–2100 nm. It is not recommended for temperature sensitive applications, such as precision mirrors.

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Moreover, Avantier MTF acknowledges the significance of pixel resolution and high resolution in modern imaging technologies. It focuses on addressing challenges related to smartphone camera optics, under-display camera technology, and lens design to deliver cutting-edge measurement technologies that meet the demands of the industry.

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The Avantier Metrology service using TriOptics MTF Test Station is a cutting-edge testing system designed to evaluate the imaging performance of optical systems. Using the Modulation Transfer Function (MTF) principle, this station objectively and quantitatively assesses the resolution and quality of lenses. By analyzing the relative image contrast divided by relative object contrast, it calculates the MTF at various spatial frequencies and field of view positions. The system employs advanced techniques like Fourier analysis, utilizing single slits, crosses, or pinholes as test targets to determine the MTF accurately. Whether in finite-finite or infinite-finite imaging conditions, the Avantier Metrology service provides crucial data for optical and systems designers, enabling them to predict and compare the performance of optical systems effectively. Please contact us if you’d like to schedule a free consultation or request for a quote on your next project.

MTF

In pursuit of providing comprehensive solutions for image quality testing, Avantier MTF also recognizes the importance of both on-axis and off-axis MTF measurements. On-axis measurement involves testing the MTF along the axis of symmetry, while off-axis measurement is carried out by moving the target in the image plane and adjusting the image analyzer accordingly. This approach ensures a thorough evaluation of optical systems, capturing performance characteristics at various spatial frequencies and cut-off frequencies.

Avantier MTF (the Modulation Transfer Function) is a new and innovative entrant in the field of MTF measurement technology, offering state-of-the-art solutions for evaluating the imaging performance of optical systems. Similar to modern MTF Testers like the ImageMaster®, Avantier MTF employs a measuring system that utilizes a single illuminated slit on an opaque background as the object for MTF testing.

UV Grade Fused Silica is synthetic amorphous silicon dioxide of extremely high purity. This non-crystalline, colorless silica glass combines a very low thermal expansion coefficient with good optical qualities, and excellent transmittance in the ultraviolet region down to 195 nm. Transmission and homogeneity exceed those of crystalline quartz without the problems of orientation and temperature instability inherent in the crystalline form. Fused silica is ideally used with high-energy lasers due to its high energy damage threshold. UV fused silica also has excellent transmission in the visible and infrared region up to approximately 2.1 µm, and a low content of inclusions with high refractive index homogeneity. Fused silica is used for both transmissive and reflective optics, especially where high laser damage threshold is required.

Modulation transfer function

The Fourier analysis of the Line Spread Function enables Avantier MTF to determine the contribution of each spatial frequency to the LSF, and the amplitude of each frequency corresponds to the contrast at that specific frequency. This comprehensive analysis of the MTF testing process allows Avantier MTF to provide accurate and reliable results for evaluating image quality and optical performance.

With a commitment to technological leadership, Avantier MTF aims to contribute significantly to the production of future mobile phone camera lenses and photolithographic optics. Its advanced MTF measurement capabilities facilitate a better understanding of the behavior of optical systems at higher spatial frequencies, providing invaluable insights into image quality and helping researchers and engineers in designing and optimizing optical systems.

To cater to various imaging systems and applications, Avantier MTF offers versatile options for its target objects, allowing users to choose between a single slit, a cross (two perpendicular slits) for simultaneous two-directional MTF measurement, or a pinhole target, which provides information about the Point Spread Function (PSF) containing complete MTF information in all image directions.

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From a mathematical standpoint, Avantier MTF uses Fourier synthesis, treating the single slit as a sum over all spatial frequencies to calculate the MTF curve. Each spatial frequency contributes to the slit with the same amplitude (=1), and through this process, Avantier MTF can assess the modulation transfer function (MTF) of the sample. However, it takes into account factors such as diffraction and aberrations, which result in broadening the slit image, represented by the Line Spread Function (LSF).