JPH0277995A - System for diagnosing function of accident preventive detector - Google Patents

Abstract

PURPOSE:To improve the reliability of an accident preventive detector by causing each hot wire sensor to perform the detecting operation of an object to be detected while the function of another hot wire sensor is diagnosed. CONSTITUTION:When the operation mode is set to the function diagnosing mode, a heater 3a for a function diagnosis corresponding to a hot wire sensor 1a is heated and the function diagnosis is independently performed to discriminate whether or not the output of the sensor 1a is normally obtained. When the sensor 1a is diagnosed, a signal process circuit 2 discriminates the presence/ absence of an object X to be detected in the detecting area based on another hot wire sensor 1b. When the function diagnosis of the sensor 1a is completed, the heater 3b corresponding to the sensor 1b is successively heated and the function diagnosis is independently performed to discriminate whether or not the output of the sensor 1b is normally obtained. At the time of diagnosis on the sensor 1b, the signal process circuit 2 discriminates the presence/absence of the object X in the detecting area based on the output of the sensor 1a.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for diagnosing the function of a security sensor that detects heat rays emitted from a human body.

[Prior Art] Conventionally, as a function diagnosis method for a crime prevention sensor that detects heat rays emitted from the human body, a heater for function diagnosis installed in the crime prevention sensor is heated, and a heater made of a pyroelectric element or the like is used. There is a method in which a hot ray is incident on a heat ray sensor and a function diagnosis of a security sensor is performed by determining whether a normal heat ray sensor output is obtained.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional example, it takes a certain amount of time (approximately 3 seconds) to cool down the function diagnosis screener to room temperature after heating it to a predetermined temperature. During this time, the heat ray sensor will not be able to detect heat rays from the detection area, so every time you perform a functional diagnosis of the security sensor, a failure to detect condition may occur and a false alarm may occur, which may reduce the reliability of the security system. There was a problem that it was damaged.

The present invention has been made in view of the above points, and its purpose is to eliminate the risk of failure to report due to the occurrence of an undetectable state during functional diagnosis, and to reduce the reliability of the security system. An object of the present invention is to provide a method for diagnosing the function of a crime prevention sensor.

[Means for Solving the Problems] The function diagnosis method of the security sensor of the present invention includes a plurality of heat ray sensors that detect heat rays from the same detection area, and determines the presence or absence of a detected object based on the output of each heat ray sensor. A security sensor is composed of a signal processing circuit for detecting heat rays and a heater for function diagnosis provided corresponding to each heat ray sensor, and the heater generates a hot ray to check whether the heat ray sensor output can be obtained normally. The function diagnosis for each heat ray sensor can be performed independently for each heat ray sensor, and during the function diagnosis of each heat ray sensor, the other heat ray sensors can detect the detected object. The present invention is configured as described above, and determines the presence or absence of an object to be detected based on the outputs of a plurality of heat ray sensors that detect heat rays from the same detection area, and also provides a sensor corresponding to each heat ray sensor. A hot ray is generated by a heater for function diagnosis, so that the function diagnosis of each heat ray sensor can be performed independently, and during the function diagnosis of each heat ray sensor, the detection operation of the object to be detected is performed by another heat ray sensor. As a result, there is no risk of an undetectable state occurring during functional diagnosis and a false alarm, and the reliability of the security system will not be compromised.

[Embodiment] Fig. 1 shows an embodiment of the present invention, which includes a plurality of (two in the embodiment) heat ray sensors la and lb that detect heat rays from the same detection area, and the output of each heat ray sensor la and lb. a signal processing circuit 2 that determines the presence or absence of the detected object X based on;
Each heat ray sensor la.

A crime prevention sensor Y is configured with heaters 3a and 3b for function diagnosis provided corresponding to the heaters 3a and 3b, respectively.
A function diagnosis for determining whether or not the specific output of the heat ray sensors 1a and lb can be normally obtained by generating a heat ray in the heat ray sensor 1a and lb can be performed independently for each of the heat ray sensors la and lb, and each heat ray sensor la.

During the functional diagnosis of 1b, another heat ray sensor la.

In the figure, 4 is a sensor line, and the alarm signal output from the signal processing circuit 2 is sent to the sensor line 4 for security reception. and transmitted to a machine (not shown).

The operation of the embodiment will be explained below based on the flowchart of FIG. 2. Currently, the signal processing circuit 2 is checking whether the operation mode is set to the functional diagnosis mode, and in normal mode operation, which is not set to the functional diagnosis mode, the outputs of the heat ray sensors la and lb are subjected to calculation processing. Then, the presence or absence of the detected object is determined to determine whether or not to issue an alarm. In this embodiment, detection signals are obtained from both the reheating ray sensors la and lb, and an alarm signal is output when the reheating ray sensors la and lb are not detected, thereby preventing the occurrence of false alarms. Incidentally, if an alarm signal is output when a detection signal is output from either of the heat ray sensors la and lb, false alarms can be prevented.

On the other hand, when the operation mode is set to the function diagnosis mode, first, the heater 3a for function diagnosis corresponding to the heat ray sensor 1a is heated, and a function diagnosis is performed to determine whether the output of the heat ray sensor 1a can be obtained normally. conducted independently. At this time, since the function diagnosis of the heat ray sensor 1b is not performed, the signal processing circuit 2 determines the presence or absence of the detected object X in the detection area based on the output of the heat ray sensor 1b.

When the functional diagnosis of the heat ray sensor 1a is completed, the heater 3b for functional diagnosis corresponding to the heat ray sensor 1b is heated, and a functional diagnosis is independently performed to determine whether the output of the heat ray sensor 1b can be obtained normally. .

At this time, since the function diagnosis of the heat ray sensor 1a is not performed, the signal processing circuit 2 determines the presence or absence of the detected object X in the detection area based on the output of the heat ray sensor 1a.

As described above, in the present invention, each heat ray sensor la,
Heaters 3a, 3 for function diagnosis provided corresponding to lb.
A hot ray is generated in b to enable the function diagnosis of each heat ray sensor la, lb to be performed independently, and each heat ray sensor la, lb
Since the other heat ray sensors lb and la are configured to perform the detection operation of the detected object X during the functional diagnosis of This ensures that reliability is not compromised.

In addition, as mentioned above, each heat ray sensor la.

When the functional diagnosis of 1b is completed, the detection operation in the signal processing circuit 2 returns to the normal mode in which the presence or absence of the detected object X is determined based on the outputs of both the heat ray sensors la and lb.

[Effects of the Invention] The present invention is configured as described above, and determines the presence or absence of a detected object based on the outputs of a plurality of heat ray sensors that detect heat rays from the same detection area. Heat rays are generated by heaters for function diagnosis provided in each of the heat ray sensors, so that the function diagnosis of each heat ray sensor can be performed independently, and during the function diagnosis of each heat ray sensor, the detection operation of the object to be detected by other heat ray sensors is performed. This has the effect that there is no risk of failure to report due to an undetectable state occurring during functional diagnosis, and the reliability of the security system will not be impaired.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 2 is a flowchart showing the same operation. la and lb are heat ray sensors, 2 is a signal processing circuit, 3a and 3
b is a heater. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

[Claims] (1) Multiple heat ray sensors that detect heat rays from the same detection area, a signal processing circuit that determines the presence or absence of a detected object based on the output of each heat ray sensor, and functions provided for each heat ray sensor. A crime prevention sensor is configured with a diagnostic heater, and the heater generates a hot ray to enable functional diagnosis to be performed independently for each heat ray sensor to determine whether the hot ray sensor output is normally obtained. A method for diagnosing the function of a crime prevention sensor, characterized in that during the function diagnosis of each heat ray sensor, another heat ray sensor is caused to detect an object to be detected.