JP4589735B2 - Radiation temperature sensor - Google Patents

Description

The present invention relates to a radiation temperature sensor that measures the temperature of an object by detecting infrared energy emitted from the object.

The radiation temperature sensor measures the actual temperature of the measurement object by detecting the infrared energy radiated from the measurement object and correcting the infrared energy with the emissivity of the measurement object (for example, a patent) Reference 1). Since such a radiation temperature sensor can measure temperature without contact with the measurement object, it can accurately measure the temperature even for an object with poor thermal conductivity or an object with a small heat capacity. In addition, the temperature of the moving object and the rotating body can be measured at high speed and with high accuracy. Therefore, the radiation temperature sensor is used for temperature management of various objects, for example, in factory automation (FA).
JP-A-8-278203

  However, since the emissivity differs depending on the object, it is necessary to set the emissivity for each measurement object. Therefore, the operator must remember the emissivity of the measurement object or always carry the emissivity table during temperature measurement. Therefore, it takes time to measure the temperature, and the working efficiency is lowered.

An object of the present invention is to provide a radiation temperature sensor in which temperature measurement work is made efficient.

The radiation temperature sensor according to the present invention is capable of setting a threshold value corresponding to the set emissivity by setting infrared detecting means for detecting infrared energy from the measuring object and the emissivity of the measuring object. Setting means; storage means for storing a plurality of combinations of emissivities and threshold values set by the setting means; emissivity of combinations selected by an external input among the plurality of combinations stored in the storage means; and infrared rays calculation means for calculating the temperature of the measurement object on the basis of the infrared energy detected by the detecting means, and a temperature output unit for outputting the temperature calculated by the calculation means, the threshold of the selected combination by the external input out and values, based on the infrared energy detected by the infrared detection means, a determining means for detecting the state of the measurement object, the result of the determination by the determining means And a determination result output unit which is capable setting a plurality of combination of emissivity and threshold by setting means for one measurement object.

In the radiation temperature sensor according to the present invention, infrared energy from the measurement object is detected by the infrared detection means. The emissivity of the measurement object is set by the setting means, and a threshold value can be set in correspondence with the set emissivity. A plurality of combinations of emissivities and threshold values set by the setting means are stored in the storage means. And emissivity of the combination selected by the external input of the plurality of combinations stored in the storage means, on the basis of the infrared energy detected by the infrared detection means, the temperature of the measurement object is calculated by calculation means . The calculated temperature is output by the temperature output unit. Further, the detection state of the measurement object is determined by the determination unit based on the threshold value of the combination selected by the external input and the infrared energy detected by the infrared detection unit . The determination result is output by the determination result output unit. A plurality of combinations of emissivities and threshold values can be set for one measurement object by setting means .

In this case, the temperature of the measurement object is calculated based on the emissivity of the combination selected by the external input . Therefore, the user does not need to remember the emissivity of various objects, and does not need to carry an emissivity table or the like during temperature measurement. As a result, the temperature measurement work is made efficient.

In addition, since the detection state of the measurement object is determined based on the combination threshold value selected by the external input and the infrared energy detected by the infrared detection means , the radiation temperature sensor detects the presence or change of the object. It can also be used as a detecting device.

Furthermore, since the determination result is output by the determination result output unit, the user can easily recognize the determination result .

The radiation temperature sensor may include a changing unit that receives a change in the emissivity or the threshold set by the setting unit.

  The calculating means calculates a plurality of temperatures based on a plurality of combinations of emissivities stored in the storage means and the infrared energy detected by the infrared detecting means, and the radiation temperature sensor is a plurality of temperatures calculated by the calculating means. A plurality of temperature output units that respectively output the temperatures may be provided.

  In this case, since the plurality of temperatures based on the plurality of emissivities are output by the plurality of temperature output units, the user can use an appropriate temperature corresponding to the measurement object among the plurality of temperatures. Therefore, even if the measurement object changes, the accurate temperature of the measurement object can be obtained without the user changing the emissivity. In addition, the user does not need to remember the emissivity of various objects, and does not need to carry an emissivity table or the like at the time of temperature measurement. As a result, the temperature measurement work is made efficient.

  Each of the plurality of combinations includes a plurality of emissivities and a plurality of threshold values, and the calculating means includes a plurality of emissivities of combinations selected by an external input among the plurality of combinations stored in the storage means, and infrared rays A plurality of temperatures may be calculated based on the infrared energy detected by the detection unit, and the radiation temperature sensor may include a plurality of temperature output units that respectively output the plurality of temperatures calculated by the calculation unit.

  In this case, since the plurality of temperatures based on the plurality of emissivities are output by the plurality of temperature output units, the user can use an appropriate temperature corresponding to the measurement object among the plurality of temperatures. Therefore, even if the measurement object changes, the accurate temperature of the measurement object can be obtained without the user changing the emissivity. In addition, the user does not need to remember the emissivity of various objects, and does not need to carry an emissivity table or the like at the time of temperature measurement. As a result, the temperature measurement work is made efficient.

  According to the present invention, the user does not need to remember the emissivity of various objects, and does not need to carry an emissivity table or the like during temperature measurement. Thereby, temperature measurement work is made efficient.

Hereinafter, a radiation temperature sensor according to an embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram of a radiation temperature sensor according to the first embodiment of the present invention. As shown in FIG. 1, the radiation temperature sensor 100 according to the present embodiment includes a head portion 100A and a main body portion 100B.

  The head portion 100A and the main body portion 100B are connected to each other by a cable 80.

  FIG. 2 is an external perspective view of the head unit 100A of FIG.

  Each component of the head portion 100A is built in a substantially rectangular parallelepiped head casing K. The head casing K has an upper surface KU, a lower surface KD, a front surface KF, a back surface KB, and side surfaces KS1 and KS2.

  In the description of FIG. 2, the direction perpendicular to the side surfaces KS1 and KS2 is referred to as the X direction, the direction perpendicular to the front surface KF and the rear surface KB is referred to as the Y direction, and the direction perpendicular to the upper surface KU and the lower surface KD is referred to as the Z direction. .

  In FIG. 2, an infrared condensing unit KH and laser emitting units K60 and K70 are provided on the front surface KF of the head casing K, display lamps 36a, 36b and 36c made of light emitting diodes are provided on the upper surface KU, and cable connection is made to the rear surface KB. Part KJ is provided. By providing the indicator lamps 36a, 36b, 36c on the upper surface KU, the user can easily recognize the lighting and blinking status of the indicator lamps 36a, 36b, 36c. Laser diodes 60 and 70, which will be described later, are provided in the laser output units K60 and K70, respectively.

  In the infrared condensing unit KH, infrared rays radiated from the measurement object are captured. Laser light generated by the laser diodes 60 and 70 is emitted from the laser emitting portions K60 and K70 toward the measurement location. Thereby, the user can easily recognize the measurement location of the measurement object.

  A cable 80 is connected to the cable connecting portion KJ. The cable 80 is connected to the main body 100B as described above.

  3 is a block diagram of the head unit 100A of FIG. 1, and FIG. 4 is a block diagram of the main body unit 100B of FIG.

  As shown in FIG. 3, the head unit 100 </ b> A includes a thermopile 10, a preamplifier substrate 20, a main substrate 30, a power supply substrate 40, and two laser diodes 60 and 70.

  The thermopile 10 includes an infrared light receiving unit 11 and a thermistor 12. A first signal amplifying unit 21 and a second signal amplifying unit 22 are mounted on the preamplifier substrate 20. The main board 30 includes a third signal amplifying unit 31, analog-digital conversion circuits (hereinafter abbreviated as AD conversion circuits) 32, 33, a CPU (central processing unit) 34, a storage unit 35, an indicator lamp 36a, 36b and 36c and a laser drive circuit 37 are mounted.

  A power supply circuit 41, a communication circuit 42, and a laser drive circuit 43 are mounted on the power supply board 40. A cable 80 including a power supply line and a signal line is connected to the power supply board 40.

  In the thermopile 10, the infrared light receiving unit 11 detects infrared energy emitted from the measurement object. The thermistor 12 detects the internal temperature of the thermopile 10.

  In the preamplifier substrate 20, the first signal amplifier 21 amplifies the output signal of the infrared light receiver 11. The second signal amplifier 22 amplifies the output signal of the thermistor 12.

  In the main substrate 30, the third signal amplification unit 31 amplifies the output signal of the first signal amplification unit 21. The AD conversion circuit 32 converts the output signal of the first signal amplifying unit 21 into a digital signal, and gives the digital signal to the CPU 34 as the detected temperature value of the measurement object.

  The AD conversion circuit 33 converts the output signal of the second signal amplifying unit 22 into a digital signal, and provides the digital signal to the CPU 34 as the internal temperature value of the thermopile 10.

  The storage unit 35 stores information about the thermopile 10 and the like. The information regarding the thermopile 10 includes, for example, the gain and offset value of the infrared light receiving unit 11, the gain and offset value of the thermistor 12, and the measured temperature range and temperature scale of the thermopile.

  The detected temperature value given from the AD conversion circuit 32 and the internal temperature value given from the AD conversion circuit 33 are given to the CPU 34. Then, the CPU 34 gives the detected temperature value and the internal temperature value to the main body 100B through the communication circuit 42 and the cable 80.

  Further, the CPU 34 feedback-controls the gain of the third signal amplifying unit 31 based on the level of the output signal of the AD conversion circuit 32.

  Further, the CPU 34 controls the operations of the indicator lamps 36 a, 36 b, 36 c, the laser drive circuit 37 and the laser drive circuit 43 of the power supply substrate 40.

  The indicator lamps 36a, 36b, and 36c display on / off states of detection signals corresponding to banks B1 to B3, which will be described later, under the control of the CPU 34. Thereby, the user can easily confirm the state of the detection signal. The laser drive circuit 37 drives the laser diode 60 under the control of the CPU 34.

  In the power supply board 40, the power supply circuit 41 supplies power supplied from the main body 100B through the cable 80 to each component of the head 100A.

  Both the communication circuit 42 and the laser drive circuit 43 are connected to the CPU 34 of the main board 30 via the relay board 50.

  As described above, the communication circuit 42 performs communication between the CPU 34 and the main body 100B via the cable 80. The laser drive circuit 43 drives the laser diode 70 under the control of the CPU 34. Laser light emitted from the laser diodes 60 and 70 is applied to the measurement location of the measurement object.

  As shown in FIG. 4, the main body unit 100 </ b> B includes a power supply circuit 91, a communication circuit 92, a CPU 93, a display unit 94, a storage unit 95, an operation setting unit 96, and an external input / output circuit 97.

  A cable 80 is connected to the power supply circuit 91 and the communication circuit 92. The power supply circuit 91 includes a power supply source such as a battery, and supplies the power to each component of the main body 100B and the head 100A. The communication circuit 92 performs communication between the CPU 93 and the head unit 100A via the cable 80.

  The storage unit 95 stores an arithmetic expression for the CPU 93 to calculate the temperature of the measurement object.

  The storage unit 95 includes a plurality of storage areas (hereinafter referred to as banks) B1, B2, and B3. In each of the banks B1 to B3 of the storage unit 95, an emissivity and a threshold value are stored. In the present embodiment, the first emissivity and the first threshold value are stored in bank B1, the second emissivity and the second threshold value are stored in bank B2, and the third emissivity is stored in bank B3. Emissivity and a third threshold value are stored. The user can set and change these emissivities and threshold values by operating the operation setting unit 96. The set emissivity and threshold value are stored in the selected bank of the storage unit 95.

  The CPU 93 controls the operation of each component of the main body 100B. Further, the CPU 93 calculates the temperature value of the measurement object based on the detected temperature value and the internal temperature value given from the head unit 100 </ b> A and the emissivity given from the storage unit 95. Here, the emissivity given from the storage unit 95 to the CPU 93 is determined by the user operating the operation setting unit 96 and selecting a bank according to the measurement object. Thereby, the CPU 93 can measure the actual temperature of the measurement object (hereinafter referred to as an actual temperature value). Note that the bank may be selected by a digital signal DI input from the outside via the external input / output circuit 97.

  Further, the CPU 93 displays the calculated actual temperature value as a numerical value on the display unit 94 and outputs the analog signal AO and the digital signal DO from the external input / output circuit 97 to the outside through the output terminals Pa and Pb. In this case, the user can easily check the temperature of the measurement object by the display unit 94.

  Further, the CPU 93 compares the calculated actual temperature value with the threshold value stored in the selected bank, and outputs the comparison result from the external input / output circuit 97 as the detection signal DET via the output terminal Pc. And the state of the detection signal DET is displayed on the display unit 94. Further, the CPU 93 gives a detection signal DET to the CPU 34 of FIG. The CPU 34 controls lighting or extinguishing of the indicator lamps 36a, 36b, 36c based on the given detection signal DET. The user can easily recognize the state of the detection signal DET by the display unit 94 and the indicator lamps 36a, 36b, and 36c.

  For example, the detection signal is turned on (for example, high level) when the actual temperature value is higher than the threshold value, and is turned off (for example, low level) when the actual temperature value is equal to or less than the threshold value.

In this way, the radiation temperature sensor 100 according to the present embodiment displays and outputs the actual temperature value of the measurement object, and determines whether the actual temperature value is higher than the threshold value (ON state) Or off state) can be displayed and output.

  As described above, in the present embodiment, when the temperature is measured, the user selects a bank according to the measurement object, and the temperature of the measurement object is based on the emissivity stored in the bank. Is measured. Therefore, the user does not need to remember the emissivity of various objects, and does not need to carry an emissivity table at the time of temperature measurement. Thereby, temperature measurement work is made efficient.

Each bank stores a threshold value together with the emissivity, and a detection signal DET is output based on the threshold value. Therefore, the radiation temperature sensor according to the present embodiment can also be used as a detection device that detects the presence or absence or change of an object.

  In addition, since the emissivity and threshold value stored in each bank can be arbitrarily changed by the user, it is possible to measure and detect any object.

  In addition to the emissivity and threshold value, the storage unit 95 may store other parameters such as adjustment sensitivity, response time, sensor gain, display unit, and output range according to the measurement object. Thereby, the temperature measurement work is further improved in efficiency.

  Further, the emissivity and the threshold value may be stored in different banks. In this case, the emissivity and the threshold value can be arbitrarily selected and combined. For example, when it is desired to change only the threshold value during temperature measurement, the user only needs to switch the bank in which the threshold value is stored.

  In the present embodiment, the emissivity and the threshold value are stored in the banks B1 to B3, respectively. However, the number of banks for storing the emissivity and the threshold value is not limited to three, but two or The emissivity and the threshold value may be stored in each of four or more banks.

(Second Embodiment)
It differs from the radiation temperature sensor radiation temperature sensor according to the second embodiment according to the first embodiment in the following points.

FIG. 5 is a block diagram of the main body 100B of the radiation temperature sensor according to the second embodiment.

In the radiation temperature sensor according to the second embodiment, the CPU 93 detects the detected temperature value and the internal temperature value given from the head unit 100A of FIG. 3 and the first to third emissivities stored in the storage unit 95. The first to third temperature values are calculated based on the above. Further, the CPU 93 outputs the first temperature value from the external input / output circuit 97 to the outside as the first analog signal AO1 and the first digital signal DO1 via the output terminals P1 and P4, and the second temperature value. Is output as the second analog signal AO2 and the second digital signal DO2 through the output terminals P2 and P5, and the third temperature value is output as the third analog signal AO3 and the third digital signal DO3. Output to the outside via P3 and P6.

  The CPU 93 also compares the first temperature value with the first threshold value, compares the second temperature value with the second threshold value, and compares the third temperature value with the third threshold value. The comparison result is output from the external input / output circuit 97 as the first detection signal DET1, the second detection signal DET2, and the third detection signal DET3 via the output terminals P7 to P9. .

  As described above, in the present embodiment, a plurality of analog signals AO1 to AO3 and a plurality of digital signals DO1 to DO3 based on a plurality of emissivities are output by a plurality of output terminals P1 to P6. Can use an appropriate output signal corresponding to the measurement object among the plurality of output signals. Therefore, even if the measurement object changes, the accurate temperature of the measurement object can be obtained without the user changing the emissivity.

  In addition, since a plurality of detection signals DET1 to DET3 using a plurality of threshold values are output from the plurality of output terminals P7 to P9, the user can select an appropriate one of the plurality of detection signals DET1 to DET3 according to the measurement object. Simple detection signals can be used. Therefore, even if the measurement object changes, an accurate detection state of the measurement object can be obtained without the user changing the threshold value.

  As a result, the temperature measurement work is made efficient.

(Third embodiment)
The radiation temperature sensor according to the third embodiment is different from the radiation temperature sensor according to the second embodiment in the following points.

FIG. 6 is a diagram for explaining the outline of the storage unit 95 of the radiation temperature sensor according to the third embodiment.

In the radiation temperature sensor according to the third embodiment, the storage unit 95 includes a plurality of banks B4, B5, and B6. The bank B4 includes first to third emissivities and first to third threshold values. Is stored in the bank B5, and the fourth to sixth emissivities and the fourth to sixth threshold values are stored in the bank B5, and the seventh to ninth emissivities and the seventh to ninth threshold values are stored in the bank B6. Is memorized.

  The emissivity and threshold value given to the CPU 93 are determined by the user selecting a bank. For example, when the user selects bank B4, the CPU 93 is provided with the first to third emissivities and the first to third threshold values.

  Further, based on the first, fourth, or seventh emissivity and the first, fourth, or seventh threshold, the first analog signal AO1, the first digital signal DO1, and the first detection signal DET1. Is output and based on the second, fifth or eighth emissivity and the second, fifth or eighth threshold, the second analog signal AO2, the second digital signal DO2 and the second detection The signal DET2 is output and based on the third, sixth or ninth emissivity and the third, sixth or ninth threshold value, the third analog signal AO3, the third digital signal DO3 and the third Detection signal DET3 is output.

  As described above, in this embodiment, the user can change the emissivity and the threshold corresponding to each output signal by switching the bank, so that more objects can be measured. become.

(Correspondence between each component of claim and each part of embodiment)
In the above embodiment, the thermopile 10 corresponds to infrared detection means, the storage unit 95 corresponds to storage means, the banks B1 to B6 correspond to storage areas, and the operation setting unit 96 or the digital signal DI serves as setting means. The CPU 93 corresponds to the calculation means and the determination means, the display lamps 36a, 36b, 36c, the display section 94 and the output terminals Pc, P7 to P9 correspond to the determination result output section, and the display section 94 and the output terminals Pa, Pb, P1 to P6 correspond to the temperature output unit, and the operation setting unit 96 corresponds to the changing means .

  The present invention can be used to detect a temperature change of an object based on infrared energy radiated from the object.

It is a block diagram of a radiation temperature sensor concerning a 1st embodiment of the present invention. It is an external appearance perspective view of the head part of FIG. It is a block diagram of the head part of FIG. It is a block diagram of the main-body part of FIG. It is a block diagram of the main-body part of the radiation temperature sensor which concerns on 2nd Embodiment. It is a figure for demonstrating the outline of the memory | storage part of the radiation temperature sensor which concerns on 3rd Embodiment.

10 Thermopile 11 Infrared receiver 11
12 Thermistor 34,93 CPU
35, 95 Storage unit 36a, 36b, 36c Indicator lamp 94 Display unit 96 Operation setting unit 97 External input / output circuit 100 Radiation temperature sensor 100A Head unit 100B Main unit AO, AO1-AO3 Analog signal B1-B6 Bank DO, DO1-DO3 , DI Digital signal DET, DET1 to DET3 Detection signal Pa, Pb, Pc, P1 to P9 Output terminal

Claims (4)

Infrared detecting means for detecting infrared energy from the measurement object;
Setting means capable of setting the emissivity of the measurement object and setting a threshold corresponding to the set emissivity;
Storage means for storing a plurality of combinations of emissivities and threshold values set by the setting means;
Calculating means for calculating the emissivity of the combination selected by the external input of the plurality of combinations stored in the storage means, the temperature of the object to be measured based on the infrared energy detected by the infrared detection means and,
A temperature output unit for outputting the calculated temperature by pre-Symbol calculating means,
A determination unit for determining a detection state of the measurement object based on a threshold value of the combination selected by the external input and the infrared energy detected by the infrared detection unit;
And a determination result output unit for outputting a determination result of said determination means,
A radiation temperature sensor , wherein a plurality of combinations of emissivity and threshold value can be set by the setting means for one measurement object . The radiation temperature sensor according to claim 1, further comprising a changing unit that receives a change in the emissivity or the threshold set by the setting unit . The calculation means calculates a plurality of temperatures based on a plurality of combinations of emissivities stored in the storage means and infrared energy detected by the infrared detection means,
The radiation temperature sensor according to claim 1 , further comprising a plurality of the temperature output units that respectively output a plurality of temperatures calculated by the calculation unit . Each of the plurality of combinations includes a plurality of emissivities and a plurality of thresholds;
The calculation means calculates a plurality of temperatures based on a plurality of emissivities of combinations selected by an external input among a plurality of combinations stored in the storage means and infrared energy detected by the infrared detection means. And
The radiation temperature sensor according to claim 1 , further comprising a plurality of the temperature output units that respectively output a plurality of temperatures calculated by the calculation unit .

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