GB1406575A - Particle detection apparatus - Google Patents
Particle detection apparatusInfo
- Publication number
- GB1406575A GB1406575A GB5064373A GB5064373A GB1406575A GB 1406575 A GB1406575 A GB 1406575A GB 5064373 A GB5064373 A GB 5064373A GB 5064373 A GB5064373 A GB 5064373A GB 1406575 A GB1406575 A GB 1406575A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- shift register
- scan
- register
- pulses
- Prior art date
- 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
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06M—COUNTING MECHANISMS; COUNTING OF OBJECTS NOT OTHERWISE PROVIDED FOR
- G06M11/00—Counting of objects distributed at random, e.g. on a surface
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
1406575 Image analyzing MINNESOTA MINING & MFG CO 31 Oct 1973 [1 Nov 1972] 50643/73 Heading G1A [Also in Division G4] A line scanning image analyzing system employs a shift register to store intercepts for one line period, the shift register being driven by a clock pulse generator which is triggered to deliver a selected number of clock pulses on receipt of a synchronizing pulse at the beginning of each line scan; in known fashion the stored signals are compared with current signals one line period later and a counter is incremented only once for each particle in the image. The image field is advanced by a motor 27 and scanned by an oscillating mirror 93 co-operating with a photo-detector 15. The signals from 15 are amplified, squared up and subjected to threshold circuits at 17, 18; the resulting pulses are increased in length and then applied to the shift register 35 and direct to an anti-coincidence circuit 48 to which is also applied the output of the shift register. At the beginning of each scan of mirror 93 a bi-stable 33 is set to release an oscillator 31 which applies stepping pulses to the register 35; when it has delivered a number of pulses equal to the number of stages of the register 35 the oscillator is inhibited by resetting of bi-stable 33. The oscillator is adjustable so the last pulse is applied to the register before the end of the scan. A bi-stable 51 is set by the leading edge of the intercept pulse from 19 and reset by the delayed pulse from the shift register. If it is not reset, indicating a new particle, a pulse generated at the trailing edge of the intercept pulse increments a counter 60. To ensure that particles of greatly varying density are counted only once the thresholds 17, 18 are lowered by a feedback circuit 20 once a particle has been identified. Since the scan is sinusoidal and therefore non-linear a compensating control is applied to the threshold circuit 18 by the mioror drive 22. Full logic circuitry is described, Figs. 4, 5, 6 (not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US302810A US3867613A (en) | 1972-11-01 | 1972-11-01 | Particle counting apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1406575A true GB1406575A (en) | 1975-09-17 |
Family
ID=23169301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5064373A Expired GB1406575A (en) | 1972-11-01 | 1973-10-31 | Particle detection apparatus |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US3867613A (en) |
| JP (1) | JPS4978585A (en) |
| AU (1) | AU470830B2 (en) |
| CA (1) | CA996770A (en) |
| FR (1) | FR2204839A1 (en) |
| GB (1) | GB1406575A (en) |
| IT (1) | IT994477B (en) |
| NL (1) | NL7314406A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3978324A (en) * | 1975-02-04 | 1976-08-31 | Hawker Siddeley Dynamics Limited | Automatic crop inventory system |
| US4207001A (en) * | 1976-05-24 | 1980-06-10 | The University Of Queensland | Particle size analyzer |
| US4181130A (en) * | 1977-11-04 | 1980-01-01 | Ivac Corporation | Drop discriminator system |
| JPH01296974A (en) * | 1988-05-23 | 1989-11-30 | Toyo Jozo Co Ltd | Colony counter |
| US7039823B2 (en) * | 2002-04-26 | 2006-05-02 | Texas Instruments Incorporated | On-chip reset circuitry and method |
| US7109475B1 (en) * | 2005-04-28 | 2006-09-19 | Thermo Finnigan Llc | Leading edge/trailing edge TOF detection |
| DE102006021487B3 (en) * | 2006-05-05 | 2007-09-06 | Parsum Gmbh | Particle amount determination method for use in particle stream, involves using evaluation unit that provides pulses for control signals used in regulating flow rate and particle size of particles stream by reducing radiation intensity |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB778288A (en) * | 1954-05-28 | 1957-07-03 | Cinema Television Ltd | Improvements in or relating to the electronic counting of objects |
| US2948470A (en) * | 1957-03-15 | 1960-08-09 | Du Mont Allen B Lab Inc | Particle counter |
| DE1084059B (en) * | 1957-05-17 | 1960-06-23 | Philips Nv | Device for particle counting |
| US3178688A (en) * | 1962-12-20 | 1965-04-13 | Control Data Corp | Character recognition by feature selection |
| US3437394A (en) * | 1966-07-26 | 1969-04-08 | Nasa | Electromagnetic mirror drive system |
| US3557352A (en) * | 1967-11-01 | 1971-01-19 | Coulter Electronics | Apparatus and method for measuring a dividing particle size of a particulate system |
-
1972
- 1972-11-01 US US302810A patent/US3867613A/en not_active Expired - Lifetime
-
1973
- 1973-10-01 CA CA182,246A patent/CA996770A/en not_active Expired
- 1973-10-19 NL NL7314406A patent/NL7314406A/xx unknown
- 1973-10-31 AU AU62049/73A patent/AU470830B2/en not_active Expired
- 1973-10-31 GB GB5064373A patent/GB1406575A/en not_active Expired
- 1973-10-31 JP JP48122683A patent/JPS4978585A/ja active Pending
- 1973-10-31 FR FR7338883A patent/FR2204839A1/fr not_active Withdrawn
- 1973-10-31 IT IT53461/73A patent/IT994477B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT994477B (en) | 1975-10-20 |
| FR2204839A1 (en) | 1974-05-24 |
| AU6204973A (en) | 1975-05-01 |
| DE2355119B2 (en) | 1977-01-27 |
| US3867613A (en) | 1975-02-18 |
| DE2355119A1 (en) | 1974-05-22 |
| NL7314406A (en) | 1974-05-03 |
| CA996770A (en) | 1976-09-14 |
| AU470830B2 (en) | 1976-04-01 |
| JPS4978585A (en) | 1974-07-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |