GB1421337A – Apparatus for detecting variations in the magnitudes of physical quantities
– Google Patents
GB1421337A – Apparatus for detecting variations in the magnitudes of physical quantities
– Google Patents
Apparatus for detecting variations in the magnitudes of physical quantities
Info
Publication number
GB1421337A
GB1421337A
GB5269072A
GB5269072A
GB1421337A
GB 1421337 A
GB1421337 A
GB 1421337A
GB 5269072 A
GB5269072 A
GB 5269072A
GB 5269072 A
GB5269072 A
GB 5269072A
GB 1421337 A
GB1421337 A
GB 1421337A
Authority
GB
United Kingdom
Prior art keywords
changes
detector
potential
temperature
transistor
Prior art date
1971-11-15
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
GB5269072A
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.)
Individual
Original Assignee
Individual
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.)
1971-11-15
Filing date
1972-11-15
Publication date
1976-01-14
1971-11-15
Priority claimed from FR7140728A
external-priority
patent/FR2161126A5/fr
1972-11-15
Application filed by Individual
filed
Critical
Individual
1976-01-14
Publication of GB1421337A
publication
Critical
patent/GB1421337A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
H03K3/26—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback
H03K3/28—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback
H03K3/281—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator
H03K3/286—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of bipolar transistors with internal or external positive feedback using means other than a transformer for feedback using at least two transistors so coupled that the input of one is derived from the output of another, e.g. multivibrator bistable
H03K3/2893—Bistables with hysteresis, e.g. Schmitt trigger
G—PHYSICS
G01—MEASURING; TESTING
G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
G01K3/00—Thermometers giving results other than momentary value of temperature
G01K3/08—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values
G01K3/10—Thermometers giving results other than momentary value of temperature giving differences of values; giving differentiated values in respect of time, e.g. reacting only to a quick change of temperature
G—PHYSICS
G08—SIGNALLING
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B17/00—Fire alarms; Alarms responsive to explosion
G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03K—PULSE TECHNIQUE
H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
H03K17/30—Modifications for providing a predetermined threshold before switching
Abstract
1421337 Measuring electrically R GUILLEUX 15 Nov 1972 [15 Nov 1971 31 Dec 1971] 52690/72 Headings G1N and G1U. Apparatus for detecting changes of a sensed quantity e.g. temperature comprises a sensing element 1 in the form of a temperature-sensitive resistor or a chain of diodes, an amplifying transistor 4 receiving potential variations due to the sensed temperature changes and providing corresponding potential changes to a detector device AD2 and via RC circuit 9, 10 to a high input impedance active element in the form of an F.E.T. 12 from which an output voltage is fed to a threshold detector AD1 and a voltage is fed back by a negative feedback path F-B to the base of transistor 4 whereby the detector AD2 will receive signals indicative of rate of change of the sensed temperature while detector AD1 senses the crossing of a predetermined threshold by the sensed temperature. In an alternative embodiment Fig. 2 the sensing element is an ionization chamber 1a including a radio-active source 1b from which the output potential is connected via the baseemitter path of transistor 15 to an amplifier in the form of F.E.T. 16 and thence to point H to which an alarm device is connected to detect rapid changes. The output potential is fed also to F.E.T. 12 via zener 17, to provide a voltage offset, and R-C delay 9, 10 the output voltage from this F.E.T. being fed back to the base of F.E.T. 16 to compensate slow changes of output potential from the ionization chamber.
GB5269072A
1971-11-15
1972-11-15
Apparatus for detecting variations in the magnitudes of physical quantities
Expired
GB1421337A
(en)
Applications Claiming Priority (2)
Application Number
Priority Date
Filing Date
Title
FR7140728A
FR2161126A5
(en)
1971-11-15
1971-11-15
FR7147781A
FR2166628A6
(en)
1971-11-15
1971-12-31
Publications (1)
Publication Number
Publication Date
GB1421337A
true
GB1421337A
(en)
1976-01-14
Family
ID=26216718
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB5269072A
Expired
GB1421337A
(en)
1971-11-15
1972-11-15
Apparatus for detecting variations in the magnitudes of physical quantities
Country Status (9)
Country
Link
US
(1)
US3813565A
(en)
JP
(1)
JPS4868287A
(en)
BE
(1)
BE791365A
(en)
CA
(1)
CA987760A
(en)
CH
(1)
CH567246A5
(en)
DE
(1)
DE2256009A1
(en)
FR
(1)
FR2166628A6
(en)
GB
(1)
GB1421337A
(en)
IT
(1)
IT970464B
(en)
Families Citing this family (7)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS5525625B2
(en)
*
1974-05-13
1980-07-07
DE2635640A1
(en)
*
1975-08-11
1977-03-03
Wormald Int
HEAT DETECTOR DEVICE
EP0092145B1
(en)
*
1982-04-21
1988-06-22
Kabushiki Kaisha Toshiba
Transistor circuit
DE3710871A1
(en)
*
1987-04-01
1988-10-20
Standard Elektrik Lorenz Ag
CIRCUIT FOR SHAPING A MEASURING SIGNAL VOLTAGE IN A RECTANGULAR SIGNAL
KR100854463B1
(en)
2007-05-21
2008-08-27
주식회사 하이닉스반도체
Temperature sensor circuit and semiconductor memory device
JP6218404B2
(en)
*
2013-03-18
2017-10-25
エスアイアイ・セミコンダクタ株式会社
Light receiving circuit
CN105976551B
(en)
*
2016-06-22
2018-05-15
中铁二局集团勘测设计院有限责任公司
A kind of fire alarm system based on BIM
Family Cites Families (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3296546A
(en)
*
1964-08-31
1967-01-03
Jr William J Schneider
Transistor circuit constructions for active type band pass filters
US3501711A
(en)
*
1968-11-12
1970-03-17
Textron Inc
Zero-voltage driven-cable amplifier
US3654468A
(en)
*
1970-03-11
1972-04-04
Industrial Nucleonics Corp
Radiation measurement system with mosfet electrometer circuit which is protected against voltage transients
0
BE
BE791365D
patent/BE791365A/en
unknown
1971
1971-12-31
FR
FR7147781A
patent/FR2166628A6/fr
not_active
Expired
1972
1972-10-24
CH
CH1552972A
patent/CH567246A5/xx
not_active
IP Right Cessation
1972-11-13
US
US00305680A
patent/US3813565A/en
not_active
Expired – Lifetime
1972-11-14
CA
CA156,395A
patent/CA987760A/en
not_active
Expired
1972-11-14
IT
IT31619/72A
patent/IT970464B/en
active
1972-11-15
DE
DE2256009A
patent/DE2256009A1/en
active
Pending
1972-11-15
JP
JP47114650A
patent/JPS4868287A/ja
active
Pending
1972-11-15
GB
GB5269072A
patent/GB1421337A/en
not_active
Expired
Also Published As
Publication number
Publication date
CH567246A5
(en)
1975-09-30
CA987760A
(en)
1976-04-20
FR2166628A6
(en)
1973-08-17
JPS4868287A
(en)
1973-09-18
IT970464B
(en)
1974-04-10
BE791365A
(en)
1973-03-01
DE2256009A1
(en)
1973-05-17
US3813565A
(en)
1974-05-28
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Legal Events
Date
Code
Title
Description
1976-05-26
PS
Patent sealed [section 19, patents act 1949]
1980-07-09
PCNP
Patent ceased through non-payment of renewal fee
