Petzvaln.

Brit.

/ˈpɛtsvɑːl/,

/ˈpɛtsv(ə)l/, U.S.

/ˈpɛtsˌvɑl/,

/ˈpɛtsv(ə)l/

Origin: From a proper name. Etymon: proper name Petzval.

Etymology: < the name of József M. Petzval (1807–91), Hungarian mathematician.

Optics and Photography.

Used attributively with reference to various concepts related to a lens system designed by Petzval; spec. Petzval condition n. the condition for freedom from astigmatism of a compound lens, that the sum of the ratios of the power of each element to its refractive index be zero. Petzval lens n. a lens consisting of two widely spaced colour-corrected compound lenses whose negative elements are on the inner sides. Petzval sum n. a number representing the degree of curvature of the field of a compound lens, derived from the refractive indices and surface radii of its elements.

ΚΠ

1878 W. de W. Abney Treat. Photogr. xxix. 202 The lenses of a Petzval portrait combination.

1892 J. T. Taylor Optics Photogr. Index 243/2 Petzval lenses for lantern.

1909 G. L. Johnson Photogr. Optics ii. 138 If rays proceeding from any position on a flat object plane meet again at a point anywhere in the image plane, every part of the image on the axial side of this point will lie approximately in a flat plane, provided the Petzval condition is fulfilled.

1934 R. Kingslake in Jrnl. Optical Soc. Amer. 24 76/1 This dotted curve is the ‘Petzval surface’ and represents the curvature of the field as computed by paraxial formulae, in the absence of any astigmatism.

1939 R. Kingslake in K. Henney & B. Dudley Handbk. Photogr. iii. 37 The Petzval lens contained four single lenses and six glass-air surfaces and covered a field of 25° at an aperture of f/3.4.

1943 A. Cox Optics 112 The greater the Petzval sum the more strongly curved is the cap of the sphere and the smaller its radius.

1986 Photogr. Nov. 9/1 Their position relative to the lens diaphragm changes: this may regulate Petzval field curvature and other monochromatic aberrations.

1996 Microelectronic Engin. 30 180/1 The convex and concave mirrors..have almost the same radius of curvature (500 mm) to satisfy the Petzval condition.

1999 ISPRS Jrnl. Photogrammetry & Remote Sensing 54 117/1 Petzval lens: a high speed, narrow FOV lens composed of two achromatic lenses positioned about an aperture stop; named after the Austrian optician Josef Petvald.

2002 Jrnl. Optical Soc. Amer. A. 19 1398 The procedure also readily identified solutions in which the Petzval sum is zero.

This is a new entry (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	petzval
释义	Petzvaln. Brit. /ˈpɛtsvɑːl/, /ˈpɛtsv(ə)l/, U.S. /ˈpɛtsˌvɑl/, /ˈpɛtsv(ə)l/ Origin: From a proper name. Etymon: proper name Petzval. Etymology: < the name of József M. Petzval (1807–91), Hungarian mathematician. Optics and Photography. Used attributively with reference to various concepts related to a lens system designed by Petzval; spec. Petzval condition n. the condition for freedom from astigmatism of a compound lens, that the sum of the ratios of the power of each element to its refractive index be zero. Petzval lens n. a lens consisting of two widely spaced colour-corrected compound lenses whose negative elements are on the inner sides. Petzval sum n. a number representing the degree of curvature of the field of a compound lens, derived from the refractive indices and surface radii of its elements. ΚΠ 1878 W. de W. Abney Treat. Photogr. xxix. 202 The lenses of a Petzval portrait combination. 1892 J. T. Taylor Optics Photogr. Index 243/2 Petzval lenses for lantern. 1909 G. L. Johnson Photogr. Optics ii. 138 If rays proceeding from any position on a flat object plane meet again at a point anywhere in the image plane, every part of the image on the axial side of this point will lie approximately in a flat plane, provided the Petzval condition is fulfilled. 1934 R. Kingslake in Jrnl. Optical Soc. Amer. 24 76/1 This dotted curve is the ‘Petzval surface’ and represents the curvature of the field as computed by paraxial formulae, in the absence of any astigmatism. 1939 R. Kingslake in K. Henney & B. Dudley Handbk. Photogr. iii. 37 The Petzval lens contained four single lenses and six glass-air surfaces and covered a field of 25° at an aperture of f/3.4. 1943 A. Cox Optics 112 The greater the Petzval sum the more strongly curved is the cap of the sphere and the smaller its radius. 1986 Photogr. Nov. 9/1 Their position relative to the lens diaphragm changes: this may regulate Petzval field curvature and other monochromatic aberrations. 1996 Microelectronic Engin. 30 180/1 The convex and concave mirrors..have almost the same radius of curvature (500 mm) to satisfy the Petzval condition. 1999 ISPRS Jrnl. Photogrammetry & Remote Sensing 54 117/1 Petzval lens: a high speed, narrow FOV lens composed of two achromatic lenses positioned about an aperture stop; named after the Austrian optician Josef Petvald. 2002 Jrnl. Optical Soc. Amer. A. 19 1398 The procedure also readily identified solutions in which the Petzval sum is zero. This is a new entry (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1878
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