DE102006019941A1 - Monitoring device for detection of persons, animals or articles, has deviating temperature against environment, particularly in area of doors, has passive infrared rays sensor unit with PIR sensor for detecting infrared-radiation - Google Patents

Abstract

The device has deviating temperature against the environment, particularly in the area of doors, has a passive infrared rays (PIR) sensor unit (20) with a PIR sensor (21,22,23,24) for detecting a infrared-radiation (80) emitted from the person (100), animals or articles. A thermo source (31,32,33,34) is arranged in the monitoring of the PIR-sensor for appliance-internal testing of the PIR-sensors. An active intensity tracer (52,54) is present for examining a free vision area of the PIR sensor unit. An independent claim is also included for a method for the proof of persons, animals or articles.

Description

The The present invention in a first aspect relates to a device for the detection of persons, animals or objects that have a divergent Temperature opposite the environment, especially in the area of doors, after Preamble of claim 1.

In In a second aspect, the invention relates to a method for the detection of persons, animals or objects that have a divergent Temperature opposite the environment, especially in the area of doors, after the preamble of claim 10.

A generic device for detection of persons, animals or objects has a PIR sensor unit having at least one PIR sensor for detecting one of the person, the Animal or object emitted infrared radiation and a Optical assembly for directing the infrared radiation to the PIR sensor unit on.

at a generic method for the detection of persons, animals or objects, one of the person with the animal or the object emitted infrared radiation detected at least one PIR sensor.

The use of PIR sensors, ie passive infrared sensors, which detect the infrared radiation emitted by the objects to be detected and do not have their own infrared source, is basically, for example DE 298 11 221 U1 known.

PIR sensors, the usual in a wavelength range from about 4 to 20 microns are used to recognize persons and animals, because the temperature difference necessary for the detection to the environment is available. This is generally a temperature difference of 1 Kelvin is sufficient. Temperature differences of about 1 Kelvin occur already on the human body. For example, the eyes are common a few Kelvin warmer as the rest Body.

In However, this technique is currently being used in safety-related areas not used as a reliable Testing the PIR sensors not possible yet was. It should also be noted that due to the physical mode of action the PIR sensors a resting person is not recognized because the PIR sensors only on heat sources react that change in amplitude or position. Such Sensors are called dynamic sensors.

task The invention is a monitoring device to create whose functional condition can be reliably tested. In addition, should a method is given, with which one for use in safety-related Sufficient reliability achieved by self-tests.

These Task is in a first aspect by the monitoring device the features of claim 1 and in a second aspect the method with the features of claim 10 solved.

The monitoring device The above-mentioned type according to the invention further developed in that in the vicinity of the PIR sensors at least one thermal source for device-internal testing the PIR sensors is arranged and that an active intensity button to check a free one Viewing range of the PIR sensor unit is present.

preferred embodiments the device according to the invention and advantageous variants of the method according to the invention are the subject the dependent claims.

When The first basic idea of the invention can be considered to be internal to the device Testing the PIR sensors in their environment a targeted controllable to arrange fast thermal source. This way you can use structurally very simple means extremely reliable functional tests performed the PIR sensors become.

One Another core idea of the invention is the fact that a Field of view of the PIR sensor unit is checked with an active intensity button. This will ensure that an area in front of the monitoring device indeed is free and thus a person actually detected by the detector becomes. For example, gluing the optical surfaces with Bubble gum or other cover of the optical assembly, the Failure of the PIR sensor lead would, reliable be recognized.

When A significant advantage of the invention is to be considered that thereby the use of cost-effective PIR sensors also for Security relevant areas opened because of the device's internal tests as well as the monitoring the field of view is an extremely high Functional safety is achieved. This way, for PIR sensors completely new applications opened up. In particular, the PIR sensors due to their technical properties used for tasks be solved with active sensors only very expensive.

By the interaction of the device internal Tests and the factual check, whether the field of vision for the PIR sensor unit actually free is, is also a particularly high security against manipulation and reliability achieved the sensors.

These Benefits will as well achieved with structurally simple and therefore cost-effective means. Furthermore is the device according to the invention also in operation due to the low compared to active systems Electricity consumption very cost-effective, which is a significant advantage compared to active systems represents significant improvement.

The PIR sensors can for example, be pyroelectric sensors.

The Optics module can basically include any type of optical components that are suitable, the Direct infrared radiation to the PIR sensor unit. For example For example, the optical assembly may be a mirror assembly. For example, here six to eight mirrors be arranged semicircular. Also the use of multiple facet mirrors and prisms for beam deflection is possible. When using a multiple-facet mirror can from the signals the PIR sensors that due to the mostly used there electronic bridge circuits can also be regarded and designated as balanced light wagons can, in principle also on ei ne movement direction of the monitored Object to be closed.

at a particularly preferred variant of the device according to the invention For example, the optical assembly is a lens assembly having a plurality of Lenses. Each for that of the monitoring device to be monitored Area desired properties, for example, a change an opening angle the surveillance area, can be easily reached with the help of lenses. As lenses can be beneficial inexpensive Plastic lenses and in particular embossed polyethylene films used become. Such polyethylene or PE films are with the desired optical properties available as standard. To the lowest possible Radiation background due to scattered radiation at the location of the PIR sensors To obtain transparent PE films are preferably used.

In addition, can be useful the lenses will be Fresnel lenses. The optical paths within the Lens material is then compared to conventional lenses considerably shortened and accordingly Absorption losses in the material can be significantly reduced.

in principle are any combinations of the respective optical components possible. For example, the lens assembly can also be partially replaced by a Mirror assembly to be replaced.

With PIR sensors are due to the technical effect principle temporal changes of the incident infrared light detected. It means that a temporally constant irradiation, for example of one not moving person from a person resting opposite this person PIR sensor can not be detected. To recognize also of It is therefore appropriate for non-stationary proof objects if the PIR sensors or the PIR sensor unit on a movable Part are arranged. For example, the PIR sensor unit is at a particularly preferred variant of the invention for mounting provided a door. Basically this is the door leaf or the door leaf any door, for example, a revolving door, act. The monitoring device For example, at a hinge edge or a secondary closing edge of a Door arranged become. It is particularly advantageous in this context that the PIR sensors due to their technical characteristics disturbing parts, such as a wall, not evidence.

The PIR sensor unit can, depending on the task a basically arbitrary Number of PIR sensors, with a single PIR sensor in principle is sufficient. For example, an entire CCD array can also be provided. However, in particularly preferred embodiments, the PIR sensor unit has two or four PIR sensors on. With a suitable optical assembly can with such a PIR sensor unit the to be monitored Areas can be adjusted very variably to the problem. For example, can each lens of a lens assembly places a 2 × 2 PIR sensor array on a monitor field depict. For example, you can wide-angle, narrow-angle, long-range or short-range monitoring configurations will be realized.

In principle, a thermal source, which is arranged in the region of the PIR sensor unit, can be sufficient for testing the PIR sensors inside the device. Particularly preferred, however, a separate thermal source is provided for each PIR sensor, so that each PIR sensor can be tested individually. As thermal sources, preferably small electrical resistances, in particular SMD resistors, are used. These components, which are available in addition to the low cost, due to their low thermal mass can deliver an extremely sharp, that is with steep edge rising and falling again infrared radiation signal. The device-internal tests of the PIR sensors can be carried out in a very defined way. Due to the small size of the SMD resistors kön In addition, they are positioned very close to the respective PIR sensors, which further increases the reliability of the device-internal test.

When active intensity button In principle, any form of intensity intensifier can be used. In a structurally simple variant of the invention, with the Nevertheless, from a security point of view an excellent Reliability of the To achieve a test procedure, is the active intensity button with at least one transmitter and at least one receiver, in particular as a light barrier, trained. It can in principle also visible light are used. Appropriately, but also here an infrared light source with one wavelength smaller than 1.1 μm. These wavelengths are well below the range of typical PIR sensors 4 μm to 20 μm, so that a mutual interference of the intensity button and the PIR sensors are not possible is. To rule out such a mutual interference, can Furthermore the signal of the active intensity button provided with a time structure, for example, be pulsed. The active intensity button can then be unproblematic in a favorable position between the PIR sensor unit and the optical assembly are arranged.

To the Evaluating the signals of the PIR sensor unit, the intensity button and for controlling the thermal sources and the intensity button is appropriate one Evaluation and control unit provided. In addition to the signal control and signal evaluation of necessary components, this evaluation and drive unit, in particular an amplifier for the PIR sensor unit, a driver for the thermal sources, a driver for the test transmitter of the active intensity button and an amplifier for the test receiver of the active intensity button include. Appropriately, can Such an evaluation and control unit also has corresponding and output interfaces. With such an evaluation and drive unit can if necessary, further evaluations, for example with regard to a Any direction of movement of the object to be monitored, carried out.

In procedurally it can also be expedient for a determined to the status of the free field of view in front of the PIR sensor unit belonging typical radiation pattern for the intensity button to carry out a teach-in process. Preferably, this training can be repeated at regular intervals. On This way it is ensured that quick changes by the monitoring device be recognized that slow changes however tracked and will not lead to the display of a malfunction.

Further Advantages and characteristics of the invention are described below Reference to the attached Schematic figures explained. Hereby shows:

1 in a schematic view of an embodiment of the monitoring device according to the invention;

2 in a schematic view of an application for the monitoring device according to the invention.

This in 1 schematically illustrated example of a monitoring device according to the invention 10 , Has as essential components a PIR sensor unit 20 , an optical assembly 40 , an intensity button with a radiation source 52 and a detector 54 as well as an evaluation and control unit 60 on. The PIR sensor unit 20 includes a total of four PIR sensors 21 . 22 . 23 . 24 , in the immediate vicinity of each a thermal source 31 . 32 . 33 . 34 is arranged. By a temporary heat radiation of these thermal sources 31 . 32 . 33 . 34 , which can be referred to as a thermal source assembly, becomes an in-device testing of the PIR sensor unit 30 carried out.

The optical assembly 40 In the example shown is a lens assembly with a total of three lenses 41 . 42 . 43 in particular Fresnel lenses made of embossed polyethylene films. The schematically illustrated lenses 41 . 42 . 43 may also be sprayed Fresnel lenses.

The function of the monitoring device 10 is described below.

One of a person 100 emitted passive infrared radiation 80 is from the lenses 41 . 42 . 43 the optical assembly 40 bundled and on the PIR sensors 21 . 22 . 23 . 24 the PIR sensor unit 20 directed. Each of these PIR sensors 21 . 22 . 23 . 24 converts the incident infrared radiation intensity into a voltage representing the strength of the received passive infrared radiation. The one from the PIR sensors 21 . 22 . 23 . 24 output voltage is the evaluation and control unit 60 supplied and from a PIR amplifier present there 62 amplified, evaluated and the result is via an output 64 provided for further processing.

Every single one of the PIR sensors 21 . 22 . 23 . 24 can via a arranged in the immediate vicinity of the PIR sensors fast thermal source 31 . 32 . 33 . 34 be tested. Such a test is also carried out by the evaluation and control unit 60 initiated. This is in the evaluation and control unit 60 a driver 66 for the thermal sources 31 . 32 . 33 . 34 intended. A fast thermal source can be realized, for example, via a small resistor, which is activated at times.

The components described so far can detect external objects and the fast thermal sources 31 . 32 . 33 . 34 a device-internal sensor test can be initiated.

A clear light path from the inside of the device to the nearer area in front of the optical assembly 40 is checked via an active intensity button, which comes from the transmitter 52 and the associated receiver 54 consists. transmitter 52 and receiver 54 are also transmitted via the evaluation and control unit 60 operated and evaluated, for which an amplifier 68 for the recipient 54 and a driver 69 for the transmitter 52 is provided.

If the transmitter 52 which is also referred to as a test transmitter, the lenses 41 . 42 . 43 the optical assembly 40 irradiated with free light path, results at the receiver 54 , which is also referred to as a test receiver, a typical receive amplitude value from the evaluation and drive unit 60 measured and stored. For this purpose, advantageously, a teach-in process can be performed. An impermissible change in the stored reception amplitude signals a completely or partially covered optical module 40 so that an existing malfunction can be detected in this way. The intervals of the device tests can either be made externally via a test input or internally via the evaluation and control unit 60 be initiated.

An application example of a monitoring device according to the invention 10 is in 2 shown. In a through hole 92 a wall 94 There is a door there 90 arranged pivotally. A monitoring device according to the invention 10 is on this door 90 , whose pivotal movement by a double arrow 96 is indicated, mounted. From the monitoring device 10 becomes a surveillance area 16 whose angular opening is indicated by dashed lines 14 is shown monitored. Because of the arrangement of the monitoring device 10 on the movable door leaf 90 can also be a person standing in front of the door and not moving there 100 with the PIR sensors of the monitoring device according to the invention 10 be detected. This would be in a fixed mounting of the monitoring device 10 For example, on the door frame, not possible.

With The present invention provides a testable sensor with an arrangement provided by PIR sensors and corresponding test equipment, the can also be used in safety-related areas. This goal is achieved by using both the device's internal sensor modules as well as the optical path in the detection range of the sensor so tested be that in addition to the failure of sensor components also a manipulation, for example through sensor cover, reliably detected becomes.

at the device according to the invention is an arrangement of one or more PIR sensors with a Optical assembly, which may consist of one or more lenses, internally tested by that near The PIR sensors arranged thermal sources for a short time infrared radiation emit. With the help of this temporary heat radiation is a device internal Testing the PIR radiation sensors allows. In addition, especially at the same time, the free field of view of the sensor is tested by the fact that the free optical Way from the inside of the sensor to the nearer Sensor environment over one or more additional optical Intensity button consisting of a transmitter, a corresponding receiver and a corresponding one Evaluation circuit, is checked. This review can be done via external or internal device Test requests are started.

The Monitoring device according to the invention can be particularly advantageous for person detection in the door area mounted on a movable door leaf become. Due to the relative movement between the opening Door and a person who is also completely can stand still, this person can be reliably detected by the monitoring device according to the invention become.

Claims (12)

Monitoring device for detecting persons, animals or objects that have a different temperature from the environment, in particular in the area of doors, with a PIR sensor unit ( 20 ) with at least one PIR sensor ( 21 . 22 . 23 . 24 ) to prove one of the person ( 100 ), the animal or the object emitted infrared radiation ( 80 ) and with an optical assembly ( 40 ) for directing the infrared radiation ( 80 ) to the PIR sensor unit ( 20 ), characterized in that in the vicinity of the PIR sensors ( 21 . 22 . 23 . 24 ) at least one thermal source ( 31 . 32 . 33 . 34 ) for device-internal testing of the PIR sensors ( 21 . 22 . 23 . 24 ) and that an active intensity button ( 52 . 54 ) for checking a free field of view of the PIR sensor unit ( 20 ) is available. Monitoring device according to claim 1, characterized in that the optical assembly ( 40 ) a lens assembly having a plurality of Lenses ( 41 . 42 . 43 ) is. Monitoring device according to claim 2, characterized in that the lenses ( 41 . 42 . 43 ) are formed in an embossed, in particular transparent, PE film. Monitoring device according to one of claims 2 or 3, characterized in that the lenses ( 41 . 42 . 43 ) Fresnel lenses are. monitoring device according to claim 1, characterized in that the optical assembly a Mirror assembly is. Monitoring device according to one of claims 1 to 5, characterized in that the PIR sensor unit ( 20 ) on a movable part, in particular a door ( 90 ), is mounted. Monitoring device according to one of claims 1 to 6, characterized in that the PIR sensor unit ( 20 ) a plurality of PIR sensors ( 21 . 22 . 23 . 24 ), in particular four PIR sensors. Monitoring device according to one of claims 1 to 7, characterized in that the thermal sources ( 31 . 32 . 33 . 34 ) electrical resistances, in particular SMD resistors, are. Monitoring device according to one of claims 1 to 8, characterized in that the intensity button ( 52 . 54 ) is a button that has at least one transmitter ( 52 ) and at least one recipient ( 54 ) having. Method for detecting persons, animals or objects having a different temperature from the environment, in particular in the area of doors, in particular using the monitoring device according to one of claims 1 to 9, in which one of the person ( 100 ), the animal or the object emitted infrared radiation ( 80 ) with at least one PIR sensor ( 21 . 22 . 23 . 24 ), characterized in that the PIR sensors ( 21 . 22 . 23 . 24 ) with thermal sources ( 31 . 32 . 33 . 34 ) are tested internally and that a viewing area in front of the PIR sensors ( 21 . 22 . 23 . 24 ) with an active intensity button ( 52 . 54 ) is monitored. Method according to claim 10, characterized in that the PIR sensors ( 21 . 22 . 23 . 24 ) for detecting even stationary detection objects on a movable part, in particular a door leaf ( 90 ), to be ordered. Method according to one of claims 10 or 11, characterized in that for the active intensity button ( 52 . 54 ) a teach-in process is performed.