JPS6139956Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Field of the invention This invention relates to an improvement of an optical pyrometer that can monitor the consumption of the battery used in the optical pyrometer.

(2) Prior Art An optical pyrometer is normally constructed as shown in FIG. The radiant energy from the high-temperature measurement object O is collected by the objective lens 1, the gray filter 2 is switched depending on the measurement range, and it is transmitted to the naked eye via the filament F of the pyrometer bulb 3, the red filter 4, and the eyepiece 5. It is designed to be incident on E. The pyrometer bulb 3 is connected to a battery 6, a switch 7, and a sliding resistor 8.
A power supply voltage is supplied through the circuit, and the current value at that time can be read with an ammeter 9. In other words, to make a measurement, the sliding resistor 8 is slid to change the current flowing through the filament F of the pyrometer bulb 3, and the filament F is visually checked so that the filament F and the measurement object O overlap. The brightness temperature value of the measurement object O is read from the indicated value of the ammeter 9 when the filament disappears.

In such a conventional optical pyrometer, when the battery 6 is exhausted and the battery voltage decreases, even if the sliding resistor 8 is slid, the brightness temperature of the filament F of the pyrometer bulb 3 does not rise, and the measurement becomes impossible. This led to errors.

In addition, in the case where a light pyrometer light bulb is lit by a lighting circuit A using an electronic circuit as shown in FIG. The consumption of the battery 6 was monitored from the reading of the voltage indicator when the switch 7 was turned on for each measurement.

However, with such a device, it is troublesome to check it every time a measurement is made, and the consumption of the battery 6 cannot be determined during the measurement, resulting in measurement errors. In addition, the voltage indicator M must be visible from the outside, which requires a large amount of space, a large number of parts, and a high price.

Additionally, batteries generally have a self-recovery property, and when the load is removed, the output voltage increases. This phenomenon is noticeable when the battery is exhausted to some extent.
For this reason, the battery checker may indicate that it is ready for use even if the battery is exhausted, and if you use it in this state, the battery voltage will immediately drop, and if you measure without knowing this, you will not be able to make accurate measurements. Ta.

(3) Purpose of the invention In view of the above points, the purpose of this invention is to relate to an optical pyrometer that can monitor battery consumption using a simple circuit.

(4) Embodiment of the invention FIG. 3 is a configuration explanatory diagram showing an embodiment of the invention. In the figure, 6 is a pair of power supply lines l ₁ ,
For example, two batteries of 1.5V are used as a DC power supply to supply voltage between l ₂ , a switch 7 is provided on one power line l ₁ side to turn on and off the power of battery 6, and power line l ₁ , A Zener diode ZD, a sliding resistor 8, a series-connected transistor Tr ₁ and a pyrometer bulb 3 are connected between l ₂ . R ₁ is a current regulating resistor installed in the power line l ₁ , R ₂ and R ₃ are resistors installed at both ends of the sliding resistor 8, and R ₄ and R ₅ are connected in parallel to the pyrometer bulb 3. , is a resistor that divides and extracts the applied voltage. 10 obtains a driving (operating) voltage from the power lines l ₁ and l ₂ , and a pyrometer bulb 3 from the connection point between the divided voltage of the sliding resistor 8 and the divided resistors R ₄ and R ₅ .
11 is a scale plate having a pointer 11a linked to a sliding resistor ₈ ; It is. The lighting circuit A is configured as described above.

Further, the blinking circuit B that monitors the voltage of the battery 6 is configured as follows. The terminal voltage across the battery 6 is supplied via the switch 7 to the variable resistor VR for setting the blinking voltage, and the divided voltage of this variable resistor VR is supplied via the lambda diode _D1 to the transistor Tr2 _.
is supplied to base B of A capacitor C ₁ is connected between the collector C of the transistor Tr ₂ and the anode of the lambda diode D ₁ , and a resistor R ₆ is provided between the collector C of the transistor Tr ₂ and the power line l ₁ ,
The emitter E is connected to the power supply line _l2 , and the potential of the collector C is supplied to the base B of the lighting transistor _Tr1 via the transistors _Tr3 and _Tr4 .

Next, the operation will be explained.

When using an optical pyrometer, switch 7 is closed, and the voltage made constant by Zener diode ZD is divided by resistor R ₂ , sliding resistor 8, and resistor R ₃ , and the voltage is divided from the common of sliding resistor 8. The voltage is applied to the non-inverting input terminal of the operational amplifier 10, while the voltage applied to the pyrometer bulb 3 is divided by resistors R ₄ and R ₅ and applied to the inverting input terminal of the operational amplifier 10;
Both voltages are compared and matched by an operational amplifier 10.
controlled by The position of the sliding resistor 8 corresponds to the voltage applied to the pyrometer bulb 3, and this value can be read as the temperature value of the object to be measured by the pointer 11a of the scale plate 11 linked to the sliding resistor 8.

Under normal conditions like this, if the voltage of battery 6 is high enough, the divided voltage of variable resistor VR will be equal to that of lambda diode.
However _, since the lambda diode _D1 has the property of rapidly becoming conductive below a certain voltage value, in this case, the lambda diode _D1 is cut off, and the transistor _Tr2 is also cut off.
The transistor Tr ₁ of the lighting circuit A remains on, the optical pyrometer bulb 3 continues to light, and measurement is performed.

Next, the voltage of battery 6 begins to drop, and lighting circuit A
When becomes below the voltage for normal operation, when the divided voltage divided by the variable resistor VR becomes below the predetermined level _e1 , the lambda diode _D1 becomes conductive and the transistor _Tr2 becomes conductive. , transistor
The collector C of Tr ₂ is almost at ground potential, turning off transistor Tr ₃ and turning on transistor Tr _4. The base B of transistor Tr ₁ of lighting circuit A is also almost at ground potential, transistor Tr ₁ is turned off, and the optical pyrometer is turned off. Light bulb 3 goes off.

At this time, the capacitor _C1 is charged with a voltage _e1 , and the sum of this voltage _e1 and the voltage eEC between the collector C and the emitter E of the transistor _Tr2 is applied to the anode of the lambda diode _D1 . A voltage higher than the predetermined level _e1 is applied, and the lambda diode _D1 is cut off again, the transistor _Tr2 is also turned off, and at this time the lighting circuit A is turned off.
Transistor Tr ₂ turns on and the light pyrometer bulb 3
lights up again.

At this time, the voltage applied to the anode of lambda diode D ₁ again becomes e ₁ or a lower voltage value, so lambda diode D ₁ turns on, transistor Tr ₂ also turns on, and transistor
Tr ₁ is turned off and the optical pyrometer bulb 3 is turned off.

From then on, repeat the same operation until the light pyrometer bulb 6
The light repeats blinking, and as the battery 6 continues to wear down, the blinking becomes weaker and turns off.

The user visually recognizes the flashing of the optical pyrometer bulb 3, and when the user knows that the battery is exhausted, the user stops the measurement and replaces the battery.

It should be noted that various types of lighting circuit A and blinking circuit B are conceivable in addition to the circuits described above.

(5) Summary of the invention As stated above, this invention uses a battery as a driving power source in an optical pyrometer that adjusts the brightness of the pyrometer bulb by adjusting the linear brightness of the pyrometer bulb using an electronic lighting circuit. The voltage is constantly monitored, and when the voltage drops below the normal operating voltage of the lighting circuit, the pyrometer light bulb blinks using the blinking circuit, allowing the user to know when the battery is depleted.

(6) Effects of the invention Therefore, it is possible to visually confirm and monitor whether the battery is depleted during measurement, and accurate measurements can be made while the light pyrometer bulb remains lit. Since this is possible, errors in operation and measurement are not caused, and there is no need for means such as a monitor display to show the monitoring results, making the configuration that much simpler.

[Brief explanation of the drawing]

1 and 2 are configuration explanatory diagrams showing a conventional example,
FIG. 3 is a configuration explanatory diagram showing an embodiment of this invention. A...Lighting circuit, B...Blinking circuit, 3...Pyrometer light bulb, 6...Battery, 7...Switch, 8...Sliding resistance, 10...Operation amplifier, _R1 to _R6 ...Resistance , ZD...Zener diode, _D1 ...Lambda diode, _Tr1 ~ _TR4 ...Transistor, _l1 , _l2
...Power line.

Claims (1)

[Scope of utility model registration request] In optical pyrometers that adjust the linear brightness of the pyrometer bulb and match the brightness using a lighting circuit using an electronic circuit, the voltage of the battery as a driving power source is constantly monitored to ensure that the voltage is below the voltage at which the lighting circuit operates normally. 1. An optical pyrometer comprising a flashing circuit that flashes the pyrometer bulb when the pyrometer reaches a certain temperature.