GB1479594A – Ultrasonic image pick-up tube arrangements
– Google Patents
GB1479594A – Ultrasonic image pick-up tube arrangements
– Google Patents
Ultrasonic image pick-up tube arrangements
Info
Publication number
GB1479594A
GB1479594A
GB4124673A
GB4124673A
GB1479594A
GB 1479594 A
GB1479594 A
GB 1479594A
GB 4124673 A
GB4124673 A
GB 4124673A
GB 4124673 A
GB4124673 A
GB 4124673A
GB 1479594 A
GB1479594 A
GB 1479594A
Authority
GB
United Kingdom
Prior art keywords
blanking
signals
ultrasonic
signal
tube
Prior art date
1974-09-02
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
GB4124673A
Inventor
Macdonald Green Ian
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.)
EMI Ltd
Original Assignee
EMI 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.)
1974-09-02
Filing date
1974-09-02
Publication date
1977-07-13
1974-09-02
Application filed by EMI Ltd
filed
Critical
EMI Ltd
1974-09-02
Priority to GB4124673A
priority
Critical
patent/GB1479594A/en
1977-07-13
Publication of GB1479594A
publication
Critical
patent/GB1479594A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
Abstract
1479594 Ultrasonic image pick-up arrangemerit EMI Ltd 2 Sept 1974 [1 Sept 1973] 41246/73 Heading H4F In an ultrasonic image pick-up tube arrangement spurious signals, termed “whiteout” (caused, e.g. by mechanical vibration of the tube target by other than image radiation), in the tube output signals are sensed during periods when the tube scanning beam is blanked and subtracted from the total output signal at other times. As shown in Fig. 1, the signal output of an ultrasonic pick-up tube 1 is supplied by a head amplifier 2, passing signals of the frequency of the ultrasonic radiation irradiating the object and an A.G.C. circuit 3, to an adder 4 the output of which is supplied to a blanking circuit 6. A blanking signal generator 6 produces a special blanking waveform 2(b), Fig. 2, (compare with the blanking waveform 2(a) supplied to the tube beam) in which the blanking action is suspended for a small interval (for an integral number of cycles of the ultrasonic frequency, e.g. 4 MHz). The output of the blanking circuit 6 is fed to synchronous demodulators 8, 9 which have as respective second inputs the in phase ultrasonic frequency α and the quadrature phase ultrasonic frequency # from source 7. The demodulated outputs are fed to respective pairs of sample and hold circuits 10, 11 and 12, 13. Circuits 10 and 12 are supplied with sampling pulses 2(c) occurring during the suspended blanking interval so that a sample of spurious signals present at this time is taken and circuits 11 and 13 are supplied with sampling pulses 2(d) so that a sample of signals occurring during the normal blanking portion of waveform 2(b), by definition zero, is taken as a reference. The difference between the outputs of each pair of the samples and hold circuits is integrated in respective integrators 14, 15 to provide outputs which, via respective voltage controlled amplifiers 16, 17 control the amplitude of the α and # components which are supplied to adder 4 to cancel the whiteout (spurious) signals and give a corrected signal output S. Other spurious signals, e.g. spikes due to the line fly-back are minimized by blanking the signal input to the A.G.C. circuit 3 by means of a blanking waveform of the form shown in 2(b) so that if the spikes are of greater amplitude than the largest signal the A.G.C. does not act on them and the spurious signals are then “interpreted” as “whiteout” signals and eliminated as described above. This type of spurious signal may also be minimized by making the ultrasonic frequency an odd multiple of half line frequency so that the spurious signal from the synchronous demodulators reverses in sign from line to line and may be filtered out. The Specification includes a description of the manner of operating the arrangement for optimum results by increasing the number of samples which are taken per line scan, by compromising between the rate of correction and the signal-to-noise ratio and the manner of operation when the frequency of the whiteout signals changes from the frequency of the ultrasonic transmitter due to the Doppler effect when there is relative movement between the object (secne) and the pick-up tube and associated ultrasonic transmitting source.
GB4124673A
1974-09-02
1974-09-02
Ultrasonic image pick-up tube arrangements
Expired
GB1479594A
(en)
Priority Applications (1)
Application Number
Priority Date
Filing Date
Title
GB4124673A
GB1479594A
(en)
1974-09-02
1974-09-02
Ultrasonic image pick-up tube arrangements
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
GB4124673A
GB1479594A
(en)
1974-09-02
1974-09-02
Ultrasonic image pick-up tube arrangements
Publications (1)
Publication Number
Publication Date
GB1479594A
true
GB1479594A
(en)
1977-07-13
Family
ID=10418812
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB4124673A
Expired
GB1479594A
(en)
1974-09-02
1974-09-02
Ultrasonic image pick-up tube arrangements
Country Status (1)
Country
Link
GB
(1)
GB1479594A
(en)
Cited By (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1990002946A1
(en)
*
1988-09-14
1990-03-22
Oliver Rubber Company
Method and apparatus for tire inspection
1974
1974-09-02
GB
GB4124673A
patent/GB1479594A/en
not_active
Expired
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
WO1990002946A1
(en)
*
1988-09-14
1990-03-22
Oliver Rubber Company
Method and apparatus for tire inspection
US4936138A
(en)
*
1988-09-14
1990-06-26
Oliver Rubber Company
Method and apparatus for tire inspection
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Legal Events
Date
Code
Title
Description
1977-11-23
PS
Patent sealed
1978-09-06
746
Register noted ‘licences of right’ (sect. 46/1977)
1983-04-07
PCNP
Patent ceased through non-payment of renewal fee
