EP1014029A2 - Detektorschaltung - Google Patents
Detektorschaltung Download PDFInfo
- Publication number
- EP1014029A2 EP1014029A2 EP99124996A EP99124996A EP1014029A2 EP 1014029 A2 EP1014029 A2 EP 1014029A2 EP 99124996 A EP99124996 A EP 99124996A EP 99124996 A EP99124996 A EP 99124996A EP 1014029 A2 EP1014029 A2 EP 1014029A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- capacitor
- detector
- signal
- circuit
- detector circuit
- 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.)
- Granted
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C13/00—Proximity fuzes; Fuzes for remote detonation
- F42C13/02—Proximity fuzes; Fuzes for remote detonation operated by intensity of light or similar radiation
Definitions
- the invention relates to a detector circuit according to the preamble of claim 1.
- Such a detector circuit is from DE 2456162 A1 in the form of a bandpass filter known, which is operated via a preamplifier from an optronic detector element, which is an optronic sensor in a radiation-sensitive voltage divider.
- the center tap of a radiation-sensitive voltage divider in each case one amplifier is driven in order to have a plurality of detector elements the number of housing bushings through single-pole interconnection within the housing to be able to reduce.
- the detector elements are thermal Radiation-sensitive sensors.
- the generic detector circuit is intended to be a useful signal for further processing in a Provide evaluation circuit, which is preferably an ignition trigger circuit according to DE-PS 3410942 or DE-PS 3210207 with u.a. a radiation sensitive Voltage divider acts.
- the function of the radiation-sensitive voltage divider is based on the fact that at the center tap upcoming DC signal level depending on the irradiation of the detector element fluctuates, generally due to greater conductivity with more intense radiation sinks.
- This excitation-dependent level drop superimposed on a DC voltage level is referred to here as the detector signal, which is to be emitted by means of the detector circuit Useful signal is implemented.
- a disadvantage of the generic detector circuit is in particular that in the filter stage with its high-pass behavior to separate the fluctuating detector signal from the DC signal levels are particularly annoying because of long-lasting capacitive recharging processes occur when the lowest possible high-pass cut-off frequency is sought, such as with Use of this detector circuit in a search detonator sensor for target acquisition. So if for example a strong but only momentary excitation of the detector element by the recorded one Irradiation takes place (as in the case of a flash of light with an optronic detector element or when swinging away over a local conflagration with one thermal detector element), then that has in the longitudinal capacity of the high-pass filter Shifting a very large amount of charge.
- the high transfer time constant due to Low high-pass cut-off frequency means that the longitudinal capacitance is strongly charged only decelerates to the extent of the reduced excitation; while one on the strong excitation following reduced excitation because of the large charge transfer time constant of the Longitudinal capacitance and the resulting long-term overload of the signal amplifier following it is initially not evaluated at all until the coupling capacity is charged with the long time constant back to the potential of the sensor-related potential fluctuations has broken down.
- the object of the invention is a detector circuit Generic type with as little effort as possible on components to further develop that in it a high pass-related recovery time - namely after only a short time extreme excitation of at least one of its detector elements - is shortened as much as possible to have normal operation available again soon after the overexcitation has subsided.
- the opposite overshoot of the detector signal becomes more abrupt Termination of overexcitation detected by a trigger circuit to a switching distance, which branches between the longitudinal capacitance and a signal amplifier following it and above it with a short time constant the potential at the capacitor from saturation lead back to below the clipping limit of the downstream signal amplifier.
- the signal amplifier can then again operate in accordance with the current fluctuation of the Detector signals are driven and deliver a correspondingly amplified useful signal.
- the Dead time after the overexcitation has subsided is many times (in the order of magnitude) of a thousand times) less than if the sinking of the capacitor charge and thus the Input level at the signal amplifier according to the exponential function with the very large one Time constant would have to be waited for, the target low frequency is specified.
- this dead time is inventively shortened to a small fraction by decaying the overexcitation on the input side the capacitor in front of the signal amplifier quickly over a low-resistance switching path is forcibly discharged until the potential has returned to that of the voltage divider tapped DC component corresponds. It is this that is forced over the switching path Potential in practice around the virtual ground potential at the entrance of the high pass downstream operational amplifier.
- forced transfer can also be initiated under software control, which is particularly advantageous if none over a longer period of time usable useful signals have occurred because possibly a permanently high level of the sensor has led to an overload of the coupling capacitor.
- the sensor 10 of the detector circuit 11 shown in FIG. 1 essentially consists of an input-side radiation-sensitive voltage divider 12 with the physical Detector element 18 and a sensitive preamplifier 13 connected downstream Sensor 10 is, via a high pass 14 as a DC voltage lock, for AC signal amplification an operational amplifier 15 is connected downstream, the resulting from the fluctuations in the detector signal 24 useful output signal 17 controls an evaluation circuit 16.
- the radiation-sensitive voltage divider 12 essentially consists of the series connection of the detector element 18 and a trimming resistor 19. The latter is used for synchronism adjustment, if several sensors 10 or detector circuits 11 are operated in parallel are (see also DE-PS 3410942) to control the evaluation circuit 16 multi-channel.
- This DC signal level 21 changes when the detector element 18 due to radiation 22 e.g. becomes lower resistance, which means that it provides a detector signal 24.
- This fluctuation 24 superimposed on the DC signal level 21 for signal 17 to be implemented at the output of detector circuit 11 is of the order of magnitude of typically only about 1 mV.
- the preamplifier 13 follows as closely as possible behind the detector element 18 and thus practically directly at the voltage divider center tap 20 in the circuit design for a comparatively low gain factor of the order of only about Ten "so that no overdriving occurs despite the high DC signal level 21 on the input side in relation to the detector signal 24.
- the high pass 14 can simply be connected in series from a series capacitor 25 and one Resistor 26 exist, which is the series resistor in the signal amplifier 15 can act.
- CxR determines the reload time constant of the capacitor 25 and thus the lower or corner frequency in the filtering effect of this High pass filter 14.
- For the practical implementation of such a detector circuit 11 is in To aim for the lowest possible base frequency with regard to the dynamics of the radiation fluctuation, approximately in the order of 10 Hz. This requires the design of the capacitor 25 with a comparatively very high capacity, the time constant for such a to achieve a low corner frequency with a sufficiently small series resistor 26, since with the size of the resistance value, the dynamic noise power which is interfering with the useful signal 17 would increase in the useful signal 17.
- the inverting operational amplifier 28 of the signal amplifier circuit 15 has the AC voltage supply with respect to the series resistor 26 is a proportional circuit 27 on, designed for the greatest possible gain (in the order of 200) is to feed the evaluation circuit 16 with a high-amplitude useful signal 17 can.
- An additional capacitive feedback 29 causes due to their short circuit high frequencies for amplification up a frequency limit. With one on Supply voltage + U placed variable resistor 30 becomes the operating point of the Amplifier operation set.
- the detector signal 24 makes a correspondingly steep deflection (FIG. 3) relative to DC signal level 21. This is followed by a correspondingly steep and strong opposite Overshoot of the detector signal 24 when the intensive radiation ends abruptly.
- the caused in the capacitor 25 in each case high charge transhipping processes, which is to be understood as the return to the voltage value, that of the voltage divider 12 equal share delivered.
- the result of such a long reloading process is that the useful signal 17 from the signal amplifier 15 is already one decayed radiation excitation can only follow again when the transhipment in the capacitor 25 has subsided below the overload limit of the amplifier 15.
- the switching path 31 can also be the series resistor 26 bridge; because it is crucial that stationary again as soon as possible after the overexcitation Conditions prevail, which are characterized in that due to a lack of current flow over the Series resistor 26 behind the series capacitor 25, the virtual ground potential of the input of the amplifier 28 prevails. Because bridging the series resistor 26 but only that would switch through virtual ground potential, the switching path 31 works to the circuit ground towards (as drawn) more reliable because more stable.
- this switching path 31 is an electronic switch approximately in construction a field effect transistor, then provides a bias circuit 32 of the drawn Art sure by means of their diode voltage drop that at the driven gate of Field effect transistor 33 has the necessary potential for that when switched on
- the ground potential also extends behind the capacitor 25.
- the discharge path resistance in the order of magnitude of typically only around 7 ⁇ results even with very large capacitance of the series capacitor 25 has a sufficiently small recharging time constant of typically shorter than 30 ⁇ s, compared to an order of magnitude of 30 ms when charging via the higher resistance 26.
- the feedback of the potential at the capacitor 25 but cannot be initialized by the trigger circuit 35. Because even without a clear moment Overdriving can result in prolonged strong radiation on sensor 10 Charging the capacitor 25 lead, with the result that the signal amplifier 15 longer Time is overridden and therefore does not provide a useful signal 17. If in the evaluation circuit 16, In other words, in software terms, a longer absence of any useful signals 17 was found it is appropriate, e.g. a discharge signal 40 from the evaluation circuit 16 to discharge the capacitor 25 via the low-resistance path 31. This is ensured that the input level of the signal amplifier 15 again within the modulation range 39 lies, the absence of useful signals 17 is not due to a loading blockage of the Isolation capacitor 25 is due.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Amplifiers (AREA)
- Electronic Switches (AREA)
Abstract
Description
- Fig. 1
- eine übersteuerungsempfindliche Detektorschaltung mit kapazitivem Hochpaß vor ihrem Signalverstärker,
- Fig. 2
- eine Triggerschaltung zum raschen zwangsweisen Rückführen der Schaltung nach Fig. 1 aus der Übersteuerung und
- Fig. 3
- ein Spannungs-Zeit-Diagramm zur Darstellung des prinzipiellen Verhaltens der Detektorschaltung nach Fig. 1 ohne und mit Einwirkung der Triggerschaltung nach Fig. 2.
Claims (6)
- Detektorschaltung (11) mit einem strahlungsempfindlichen Sensor (10) nachgeschalteten Filter- und Verstärkerstufen (Kondensator 25, Signalverstärker 15) für ein auszugebendes Nutzsignal (17), dadurch gekennzeichnet,
daß zwischen einem Längs-Kondensator (25) und dem ihm folgenden Signalverstärker (15) eine Schaltstrecke (31) zum Entladen des Kondensators (25) mit einer Zeitkonstante vorgesehen ist, die wesentlich kürzer als die Filter-Zeitkonstante des Kondensators (25) ist. - Detektorschaltung nach Anspruch 1, dadurch gekennzeichnet,
daß die Schaltstrecke (31) über eine Triggerschaltung (35) ansteuerbar ist, welche vom Ausgang der Detektorschaltung (11) beaufschlagt ist. - Detektorschaltung nach Anspruch 1 oder 2, dadurch gekennzeichnet,
daß die Schaltstrecke (31) aus einer Auswerteschaltung (16) für das Nutzsignal (17) ansteuerbar ist, wenn ein Nutzsignal (17) über wenigstens eine vorgegebenen Zeitspanne ausbleibt. - Detektorschaltung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet,
daß die Schaltstrecke (31) über eine Triggerschaltung (35) mit einer Brückenschaltung (36) ansteuerbar ist, über deren Diagonale ein Komparator (37) liegt und die von wenigstens einer mehrerer parallel arbeitender Detektorschaltungen (11) verstimmbar ist. - Detektorschaltung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet,
daß die Schaltstrecke (31) durch ein steuerbares Halbleiterbauelement verwirklicht ist, das über eine Vorspannungsschaltung (32) für niederohmigen Durchlaßwiderstand ansteuerbar ist. - Detektorschaltung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet,
daß die Schaltstrecke (31) ein Feldeffekttransistor ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19859394 | 1998-12-22 | ||
DE19859394A DE19859394C2 (de) | 1998-12-22 | 1998-12-22 | Detektorschaltung |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1014029A2 true EP1014029A2 (de) | 2000-06-28 |
EP1014029A3 EP1014029A3 (de) | 2000-11-22 |
EP1014029B1 EP1014029B1 (de) | 2002-06-12 |
Family
ID=7892214
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99124996A Expired - Lifetime EP1014029B1 (de) | 1998-12-22 | 1999-12-15 | Detektorschaltung |
Country Status (3)
Country | Link |
---|---|
US (1) | US6300616B1 (de) |
EP (1) | EP1014029B1 (de) |
DE (2) | DE19859394C2 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6812465B2 (en) * | 2002-02-27 | 2004-11-02 | Indigo Systems Corporation | Microbolometer focal plane array methods and circuitry |
US7034301B2 (en) * | 2002-02-27 | 2006-04-25 | Indigo Systems Corporation | Microbolometer focal plane array systems and methods |
TW200911200A (en) | 2007-05-08 | 2009-03-16 | Koninkl Philips Electronics Nv | Active discharge of electrode |
US7679048B1 (en) | 2008-04-18 | 2010-03-16 | Flir Systems, Inc. | Systems and methods for selecting microbolometers within microbolometer focal plane arrays |
JP5304328B2 (ja) † | 2009-03-03 | 2013-10-02 | オムロン株式会社 | 受光検出回路 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2456162A1 (de) | 1974-11-28 | 1979-09-20 | Diehl Gmbh & Co | Optoelektronische messeinrichtung, insbesondere fuer einen geschosszuender |
EP0315855A1 (de) | 1987-11-11 | 1989-05-17 | Licentia Patent-Verwaltungs-GmbH | Strahlungsdetektor-Vorrichtung |
DE3210207C1 (de) | 1982-03-19 | 1991-10-10 | Diehl Gmbh & Co | Verfahren zur Zuendansteuerung der Gefechtsladung einer Mine und Aufnehmer fuer die Gewinnung eines Zuendsignales zum Ausueben des Verfahrens |
DE3410942C1 (de) | 1984-03-24 | 1992-04-09 | Diehl Gmbh & Co | Infrarot-Detektor |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4056061A (en) * | 1959-01-20 | 1977-11-01 | Texas Instruments Incorporated | Proximity fuse |
US3910192A (en) * | 1964-05-27 | 1975-10-07 | Us Navy | Fuze signal processing circuit |
DE2634595A1 (de) * | 1975-08-05 | 1977-03-03 | Gen Electric | Geraet zur ueberwachung hoher wechselspannungen |
US4939476A (en) * | 1988-12-27 | 1990-07-03 | Crawford Ian D | Laser Rangefinder receiver preamplifier |
US5049742A (en) * | 1989-11-16 | 1991-09-17 | Kyodo Oil Technical Research Co., Ltd. | Apparatus for detecting deterioration of engine oil |
US5049752A (en) | 1990-10-31 | 1991-09-17 | Grumman Aerospace Corporation | Scanning circuit |
-
1998
- 1998-12-22 DE DE19859394A patent/DE19859394C2/de not_active Expired - Fee Related
-
1999
- 1999-11-12 US US09/438,634 patent/US6300616B1/en not_active Expired - Fee Related
- 1999-12-15 DE DE59901714T patent/DE59901714D1/de not_active Expired - Fee Related
- 1999-12-15 EP EP99124996A patent/EP1014029B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2456162A1 (de) | 1974-11-28 | 1979-09-20 | Diehl Gmbh & Co | Optoelektronische messeinrichtung, insbesondere fuer einen geschosszuender |
DE3210207C1 (de) | 1982-03-19 | 1991-10-10 | Diehl Gmbh & Co | Verfahren zur Zuendansteuerung der Gefechtsladung einer Mine und Aufnehmer fuer die Gewinnung eines Zuendsignales zum Ausueben des Verfahrens |
DE3410942C1 (de) | 1984-03-24 | 1992-04-09 | Diehl Gmbh & Co | Infrarot-Detektor |
EP0315855A1 (de) | 1987-11-11 | 1989-05-17 | Licentia Patent-Verwaltungs-GmbH | Strahlungsdetektor-Vorrichtung |
Also Published As
Publication number | Publication date |
---|---|
US6300616B1 (en) | 2001-10-09 |
DE19859394C2 (de) | 2002-07-04 |
DE59901714D1 (de) | 2002-07-18 |
EP1014029A3 (de) | 2000-11-22 |
DE19859394A1 (de) | 2000-07-06 |
EP1014029B1 (de) | 2002-06-12 |
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