JPH109953A - Infrared measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infrared measuring apparatus whose configuration is simple and which can perform a high-reliability measurement by providing a processing means by which temperature values of a plurality of temperature sensors or pseudo heat sources installed in required places within a photographing range are compared with the temperature value of an infrared imaging device. SOLUTION: Either one or more temperature sensors 41, 42 or one or more pseudo heat sources 5 at a required temperature or both are installed in required places within the photographing range of an inffared imaging device 1. Outputs of the sensors 41, 42 are converted into temperature values by a conversion means 40 so as to be supplied to a processing means 2, or temperature values of the pseudo heat sources 5 which are controlled to prescribed temperatures are supplied to the processing means 2. Then, periodically or as required, reference temperature values of the sensors 41, 42 or of the heat sources 5 and temperature values corresponding to positions of the sensors 41, 42 or of the heat sources 5 in an infrared image 30 at the device 1 are compared by the processing means 2. When they are compared, information that the output of the device 1 contains an error is reported to the outside when a considerable difference exists between both temperature values, and the maintenance operation of an infrared measuring apparatus is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared measuring device used for disaster prevention, fire detection and the like.

[0002]

2. Description of the Related Art Conventionally, in order to obtain temperature information of an object to be measured, for example, a thermography or an infrared image pickup device such as an infrared CCD camera is used to generate a thermal image by infrared rays and display the temperature value of each part. In the temperature screen,
When a portion at or above the predetermined temperature value is found, an alarm or the like can be output as an abnormality.

[0003]

However, if a thermal image is monitored for a long time using an infrared imaging device or the like, drift or the like may occur in a measurement system of the imaging device itself, or stain on a window glass may occur. This causes measurement errors, or when used outdoors or the like, changes the atmosphere, state, and condition of the measurement space due to the influence of smoke, dust, and the like, making it difficult to perform correct measurements over a long period of time.

An object of the present invention is to provide an infrared measuring apparatus capable of performing highly reliable measurement with a simple configuration in view of the above points.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an infrared imaging device for obtaining an infrared image of an object to be measured, and at least one or more temperature sensors provided at required positions within a photographing range of the infrared imaging device. Alternatively, the infrared measurement apparatus includes a pseudo heat source and processing means for comparing a temperature value of the temperature sensor or the pseudo heat source with a temperature value of the infrared imaging apparatus.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention. In FIG. 1A, 1 is a CCD
An infrared imaging device such as a camera has a shooting (imaging) range with a predetermined viewing angle A, and monitors a measurement target B such as a room. The infrared imaging device 1 converts the radiant energy incident from the measured object B into an electric signal, the output of which is processed by the built-in or external processing means 2 to generate a thermal image, and displays the measured temperature value of each part on the display device 3. Is displayed as an infrared image 30 as shown in FIG. Then, the temperature value at a certain position S in the photographing range is compared with a predetermined temperature value, and when the temperature value exceeds the predetermined temperature value, it is determined that a fire or the like has occurred, and an alarm output can be notified as abnormal.

In this case, for example, the temperature value of each part of the monitor infrared image 30 is stored in the memory of the processing means 2 before the start of the measurement, and the temperature value of each part of the monitor image and the initial value stored in the memory in advance at the time of measurement. The alarm value is determined by comparing the temperature value. By doing so, it is possible to reliably perform the alarm determination regardless of the influence of disturbance light, whether outdoors or indoors.

The object to be measured may be any building, plant equipment, or the like. When a human body is to be detected, the object moves at a predetermined speed to a screen of an initial temperature value stored in a memory in advance. The human body detection may be performed by determining the heat source.

By the way, if a thermal image is monitored for a long time, the infrared imaging apparatus 1 for obtaining an infrared image causes a drift or the like in a measurement system due to a temporal change, a mechanical shock, or the like, causing a measurement error, and the performance thereof is deteriorated. May drop. In order to perform this check, at least one or both of at least one or more temperature sensors 41 and 42 and / or one or more of the pseudo heat sources 5 having a required temperature are placed at required positions within the imaging range of the infrared imaging apparatus 1. Provide. These temperature sensors 41 and 42
Is converted into a temperature value by a conversion means 40 provided as necessary and supplied to the processing means 2, or the temperature value of the pseudo heat source 5 controlled to a predetermined temperature is processed via a temperature sensor or other means (not shown). Supplied to

Then, periodically or when necessary, the reference temperature value T0 of the temperature sensors 41, 42 or the pseudo heat source 5 is used.
The processing means 2 compares the temperature value Ti corresponding to the position of the temperature sensor 41, 42 or the pseudo heat source 5 or the like of the infrared image 30 of the infrared imaging apparatus 1. By performing this comparison, when there is a considerable difference between the two temperature values, information indicating that the output of the infrared imaging apparatus 1 has an error is notified to the outside, and maintenance, such as calibration check and replacement, is performed. Perform maintenance. Alternatively, drift compensation may be automatically performed as follows using a reference temperature value.

For example, if the difference between the temperature value T0 of the temperature sensor 41 at the position 41 'of the infrared image 30 in FIG. 1B and the temperature value Ti of the infrared imaging device 1 at this position 41' is dT, then dT = Ti-T0 (1) Since this temperature difference is used, the processing means 2 performs an automatic calibration operation of Ti + dT = Ti- (Ti-T0) = T0 (2) at predetermined time intervals. By performing this correction, correct measurement can always be performed without manual intervention. Further, when the comparison correction is performed for a plurality of locations, it is possible to perform a high-precision correction with less sensitivity unevenness.

The above-described correction method is an example, and the correction can be performed by various other methods. Also,
In the above example, the comparison was made with respect to the temperature value.

[0013]

As described above, the present invention provides an infrared imaging device for obtaining an infrared image signal of a measured object,
At least one or more temperature sensors or pseudo heat sources provided at required locations within the imaging range of the infrared imaging device, and a temperature value of the temperature sensor or the pseudo heat source is compared with an output temperature value of the infrared imaging device. And an infrared measuring device provided with a processing unit. For this reason, even if thermal imaging is monitored for a long time by the infrared imaging device, errors such as drift can be immediately known to the measurement system of the infrared imaging device itself, maintenance can be easily performed, and high performance can always be achieved. I can maintain it. Also, using the temperature difference and the like,
By automatically performing calibration compensation, stable and reliable measurement can be performed for a long time and for a long time. In addition, by performing a comparison check using temperature sensors and the like provided at a plurality of locations, changes in the spatial situation can be understood for each part, and these changes can be dealt with, the entire background of the measurement object can be corrected, and Satisfactorily the identification performance of the object to be detected can be maintained.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infrared imaging device 2 Processing means 20 Memory 3 Display means 41, 42 Temperature sensor 5 Simulated heat source A Viewing angle B Object to be measured

Claims (1)

[Claims] 1. An infrared imaging device for obtaining an infrared image of an object to be measured, at least one or more temperature sensors or pseudo heat sources provided at required locations within an imaging range of the infrared imaging device, and the temperature sensor Alternatively, an infrared measurement device comprising processing means for comparing a temperature value of the pseudo-heat source with a temperature value of the infrared imaging device.