GB1525697A – Surface measurement apparatus
– Google Patents
GB1525697A – Surface measurement apparatus
– Google Patents
Surface measurement apparatus
Info
Publication number
GB1525697A
GB1525697A
GB1681375A
GB1681375A
GB1525697A
GB 1525697 A
GB1525697 A
GB 1525697A
GB 1681375 A
GB1681375 A
GB 1681375A
GB 1681375 A
GB1681375 A
GB 1681375A
GB 1525697 A
GB1525697 A
GB 1525697A
Authority
GB
United Kingdom
Prior art keywords
transducers
composite signal
transform
component
output signals
Prior art date
1975-04-23
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1681375A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rank Organization Ltd
Original Assignee
Rank Organization Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1975-04-23
Filing date
1975-04-23
Publication date
1978-09-20
1975-04-23
Application filed by Rank Organization Ltd
filed
Critical
Rank Organization Ltd
1975-04-23
Priority to GB1681375A
priority
Critical
patent/GB1525697A/en
1976-04-23
Priority to US05/679,819
priority
patent/US4084324A/en
1976-04-23
Priority to DE2617707A
priority
patent/DE2617707C2/en
1976-04-23
Priority to JP51045616A
priority
patent/JPS51149052A/en
1978-09-20
Publication of GB1525697A
publication
Critical
patent/GB1525697A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G01—MEASURING; TESTING
G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
G01B7/34—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces
G01B7/345—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces for measuring evenness
G—PHYSICS
G01—MEASURING; TESTING
G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
G—PHYSICS
G01—MEASURING; TESTING
G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
G01B7/34—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring roughness or irregularity of surfaces
Abstract
1525697 Surface measurements RANK ORGANISATION Ltd 7 April 1976 [23 April 1975 7 Jan 1976] 16813/75 and 00475/76 Heading GIN Surface measurement apparatus in which a sensor is traversed along a path in contact with or adjacent the surface 15 of a component under test utilizes a sensor comprising three transducers 12, 13, 14, each sensitive to variations of surface height and mounted in a row spaced from one another on a common support such that in use each traverses substantially the same path upon relative movement of the support and the test surface, the spacing of the support from the surface under test providing a reference datum for the transducers in generating the output signals thereof the transducer sensitivities being a, 1 and b respectively or the output signals from the transducers being amplified by respective amplifiers having gains of a, 1 and b respectively the output signals P 1 , P 2 , P 3 , from the transducers being combined to produce a composite signal S having the form S = aP 2 + bP 3 – 2P 1 which includes no component due to imperfections in the reference datum. Thus the provision of a separate reference datum is not required. In a preferred embodiment the transducers 12, 13, 14 are spaced apart by predetermined distances l 1 , l 2 where a+ b = 2 and al 1 – b1 2 = 0, To derive information concerning the test surface texture e.g. its roughness the composite signal s is analyzed to derive the amplitude and phase of the various terms of its Fourier transform. It is stated that it can be shown that the relation between the Fourier transform Fs of the composite signal and the Faurier transform F# of the true roughness signal is given by:- From this expressions for the amplitude and phase of a harmonic of wavelength # on the surface are computed. So, to derive the Fourier components of the surface roughness signal, the composite signal from the sensor is analyzed to produce the transform Fs of which the various harmonics are weighted by factors opposite in sign to the amplitude and phase of the harmonics computed from the equations: In cases where the traversing speed of the transducers is not constant the transducer support carriage (21), Fig. 6 (not shown) has a device driven by a wheel of the carriage to provide pulses representing the movement of the carriage. The embodiment of Fig. 9 uses four transducers 27, 28, 29, 30 producing output signals p 1 , p 2 , p 3 , p 4 respectively and spaced from a nominal mid position by distances l 1 , l 2 , l 3 and l 4 respectively. The transducer output signals are amplified by amplifiers (not shown) with amplification factors 1, a, b, c respectively where from which the amplification factors may be computed for a given spacing. The composite signal s is produced by combining the signals according to the expression s = p 1 + ap 2 + bp 3 + cp 4 . The analysis of the composite signal and subsequent synthesis of the appropriate components of the Fourier transform to effect the desired weighting is performed as described above. In an embodiment for determining roundness of a component 46, Fig. 11 three transducers are supported in such a way that their lines of action meet at a common point. Fig. 10 is a schematic diagram of three transducers 31, 32, 33 disposed in this way, their lines of action meeting at a point 0 spaced by distance e from the component centre 0′. The transducer signals are p 1 , p 2 , p 3 and amplifier gains are a, 1, b as before. The angles between transducers 31, 32 and 32, 33 are α, # respectively. It is stated that for the composite signal s to include no component due to the eccentricity of the sensor path relative to the component centre then s = e {(-cos# + a cos(# + α) + b cos(# – #)} where # is the angle between the line of action of the middle transducer and the line joining points 0, 0′. From this it may be shown that: A further embodiment, Fig. 13, (not shown) uses transducers, disposed as in Fig. 1, with the circuit blocks shown for determining radius of curvature of a curved surface of a test component. The block 11a represents the sensor head bearing three transducers from which the signals p 1 , p 2 , p 3 are amplified by a, 1, b respectively and combined to form a composite signal s according to s = p 2 + p 3 -p 1 where p 1 , p 2 and p 3 are the amplified output signals from the first, second and third transducers. A computer 16 computes the co-efficients of the components of the Fourier transformer of the composite signal. The computer output feeds a high pass filter 17 and from there to a synthesizer 18 which weights the coefficients of the harmonics of the transform so as to provide an output which represents the harmonics of the transform without errors due to the variations in the reference datum. The zeroth order component of the transform is fed to a divider 71 pre-set to divide its input signal by the factor (1-a-b) to provide an output to display device 72 calibrated to display radius.
GB1681375A
1975-04-23
1975-04-23
Surface measurement apparatus
Expired
GB1525697A
(en)
Priority Applications (4)
Application Number
Priority Date
Filing Date
Title
GB1681375A
GB1525697A
(en)
1975-04-23
1975-04-23
Surface measurement apparatus
US05/679,819
US4084324A
(en)
1975-04-23
1976-04-23
Measuring instrument
DE2617707A
DE2617707C2
(en)
1975-04-23
1976-04-23
Device for measuring a surface
JP51045616A
JPS51149052A
(en)
1975-04-23
1976-04-23
Method of and apparatus for measuring surface
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB1681375A
GB1525697A
(en)
1975-04-23
1975-04-23
Surface measurement apparatus
Publications (1)
Publication Number
Publication Date
GB1525697A
true
GB1525697A
(en)
1978-09-20
Family
ID=10084137
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB1681375A
Expired
GB1525697A
(en)
1975-04-23
1975-04-23
Surface measurement apparatus
Country Status (1)
Country
Link
GB
(1)
GB1525697A
(en)
1975
1975-04-23
GB
GB1681375A
patent/GB1525697A/en
not_active
Expired
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Legal Events
Date
Code
Title
Description
1979-01-10
PS
Patent sealed
1991-12-04
PCNP
Patent ceased through non-payment of renewal fee
