Optical fabrication and testing spans an enormous range of manufacturing procedures and optical test configurations.
The manufacture of a conventional spherical lens typically begins with the generation of the optic's rough shape by grinding a glass blank. This can be done, for example, with ring tools. Next, the lens surface is polished to its final form. Typically this is done by lapping—rotating and rubbing the rough lens surface against a tool with the desired surface shape, with a mixture of abrasives and fluid in between.
Typically a carved pitch tool is used to polish the surface of a lens. The mixture of abrasive is called slurry and it is typically made from cerium or zirconium oxide in water with lubricants added to facilitate pitch tool movement without sticking to the lens. The particle size in the slurry is adjusted to get the desired shape and finish.
During polishing, the lens may be tested to confirm that the desired shape is being produced, and to ensure that the final shape has the correct form to within the allowed precision. The deviation of an optical surface from the correct shape is typically expressed in fractions of a wavelength, for some convenient wavelength of light (perhaps the wavelength at which the lens is to be used, or a visible wavelength for which a source is available). Inexpensive lenses may have deviations of form as large as several wavelengths (λ, 2λ, etc.). More typical industrial lenses would have deviations no larger than a quarter wavelength (λ/4). Precision lenses for use in applications such as lasers, interferometers, and holography have surfaces with a tenth of a wavelength (λ/10) tolerance or better. In addition to surface profile, a lens must meet requirements for surface quality (scratches, pits, specks, etc.) and accuracy of dimensions.
In scientific inquiry and academic research, fabrication is the intentional misrepresentation of research results by making up data, such as that reported in a journal article. As with other forms of scientific misconduct, it is the intent to deceive that marks fabrication as highly unethical and different from scientists deceiving themselves. In some jurisdictions, fabrication may be illegal.
Examples of activities that constitute fabrication include:
Outright synthesis of experimental data; reporting experiments that were never conducted. Sometimes referred to as "drylabbing".
"Fudging", "massaging", or outright manufacture of experimental data.
Some forms of unintentional academic incompetence or malpractice can be difficult to distinguish from intentional fabrication. Examples of this include the failure to account for measurement error, or the failure to adequately control experiments for any parameters being measured.
Fabrication can also occur in the context of undergraduate or graduate studies wherein a student fabricates a laboratory or homework assignment. Such cheating, when discovered, is usually handled within the institution, and does not become a scandal within the larger academic community (as cheating by students seldom has any academic significance).
Precision is the authorized march of Royal Military College of Canada. The RMC band performs Precision on parades for march pasts, on Ex Cadet Weekends for the parade to the Memorial Arch, and on the return, the Cadet Wing sings Tom Gelley’s words to welcome the Ex Cadets to the Parade Square.
Precision was composed in 1932 by Denise Chabot, wife of Major C. A. Chabot, a Royal Canadian Artillery officer on staff as professor of French at the College at the time. She earned the degree of Associate of the Royal Conservatory of Music and was the president of the Kingston Music Club.
Precision was inspired by "Madelon", one of the popular marching songs sung and whistled by the cadets marching on their way to the Riding School, and the favourite song of the Class of 1932. Mme Chabot improvised a variation on the song, to represent the cadence of the cadets on the march. The composition starts, “We are the gentlemen cadets of RMC We have sworn to love and serve Her Majesty…”
In statistics, the dual term variability is preferred to the use of precision. Variability is the amount of imprecision.
There can be differences in usage of the term for particular statistical models but, in common statistical usage, the precision is defined to be the reciprocal of the variance, while the precision matrix is the matrix inverse of the covariance matrix.
One particular use of the precision matrix is in the context of Bayesian analysis of the multivariate normal distribution: for example, Bernardo & Smith prefer to parameterise the multivariate normal distribution in terms of the precision matrix rather than the covariance matrix because of certain simplifications that then arise.
The term precision in this sense (“mensura praecisionis observationum”) first appeared in the works of Gauss (1809) “Theoria motus corporum coelestium in sectionibus conicis solem ambientium” (page 212). Gauss’s definition differs from the modern one by a factor of . He writes, for the density function of a normal random variable with precision h,
In this intricate dance of client acquisition and legal prowess, these services emerge as the linchpin, navigating the turbulent milieu with finesse and precision. The developing fabric of legal intake services ...Artificial Intelligence (AI) orchestrates a revolution in legal intake services, ushering in unparalleled efficiency and precision ... ....
Reduces stress and improves sleep quality Comfortable and breathable fabric Provides a cooling sensation in summer and warmth in winter Prevents bead leakage with precise stitching Evenly distributed weight for optimal comfort Compatible with duvet cover for easy maintenance ... Fabric.
Việt Nam has a rich history in fabrication and fashion. The experience of being guided through a fabric market and choosing the feel of your future favourite garments is a cultural experience in itself ... Việt Nam has a rich history in fabrication and fashion ... The precision fit when ...
Reduces stress and improves sleep quality Comfortable and breathable fabric Provides a cooling sensation in summer and warmth in winter Prevents bead leakage with precise stitching Evenly distributed weight for optimal comfort Compatible with duvet cover for easy maintenance ... Fabric. Consider the fabric that feels most comfortable against your skin.
In the intricate tapestry of the UK's workforce, a noticeable gap is emerging—one that poses a significant challenge for the future of manufacturing ... Welding, often overlooked but indispensable, forms the backbone of various industries. As the demand for precision engineering and metal fabrication rises, so does the need for adept welders ... welding. .
It enables precise control over the environment, allowing for the manipulation of matter at atomic and molecular levels ...High vacuum systems achieve vacuum levels ranging from 10^-3 to 10^-9 torr and are used in scientific research, electronics manufacturing, and semiconductor fabrication ... Precise Control.
The digital models generated through these methods can be seamlessly transferred to fabrication technologies, such as CNC (Computer Numerical Control) machines or 3D printers, for efficient and precise fabrication of architectural components ... Robotic fabrication enables efficient ...
By selecting the appropriate values for the capacitor and resistor, the time constant of the RC circuit can be adjusted, allowing precise control over the charging and discharging processes ... Since the components are fabricated together on the same chip, their electrical properties can be more precisely controlled and optimized.
The Islamic Republic of Iran, at minimum, green-lit Hamas’s terrorist attack on Israel...The Iranian regime is no stranger to widespread dissatisfaction and protests ... Protests against Iranian government institutions and leaders threaten the fabric of regime rule precisely because there is no way to oust leaders through a peaceful democratic process.
TravelVlogging. For travel vloggers, capturing the essence of a new destination is crucial ... The Infinix ZERO 4G's 2K 30FPS video recording showcases these details with exceptional precision. Your audience can appreciate the details in your makeup tutorials, the feel of fabrics in fashion hauls, and the colors in your beauty reviews ... ....
Until next season, folks ...Picture. Supplied ... "The reds follow the severity and hardening that comes with perseverance, explored through silver confections bursting onto the runway, and using sharp, cool silver fabrics with lush design and a juxtaposition of precision and softness,” read a statement from the brand.Masango by Siphosihle ... .
CENTENNIAL, Colo.--(BUSINESS WIRE)--Nov 15, 2023--. NUBURU, Inc. (“NUBURU” or the “Company”) (NYSEAmerican...Laser joining in its current state faces significant challenges rooted in energy-intensive soldering practices, resulting in inefficiencies and constraints on the precision and reliability of precise metal fabrication ... About NUBURU ... (NYSEAM ... PUB ... .
For over 65 years, J&E has provided precision machining and fabrication services to a highly diversified client base including the medical, aerospace, commercial, and agriculture industries ... precision sheet metal fabrication components, powder coat finishing, and assembly.
Additional commercial applications of the Indium Solder BumpDepositionSystem include; Indium bump bonding for fabrication of focal plane arrays, ohmic contacts for III-V and II-VI materials, precision optical coatings by ion beam and magnetron sputtering, optical filters, ...