JPS6154168B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a color temperature measurement device that measures the color temperature of a large number of temperature-measured areas in a time-sharing manner using a single color thermometer, and indicates the measured values of many of them. Regarding.

When measuring the temperature of a large number of temperature-measuring parts, it has traditionally been done to install a temperature measuring device for each temperature-measuring part, but due to the need for a large number of temperature measuring devices, This method is expensive, and there are also variations in the characteristics of each temperature measuring device, and there are problems in that each measured value is not based on a standard. In particular, when the temperature of the part to be measured is slow, it is practical to measure the temperature of many parts in a time-sharing manner using a single temperature measuring device. , the color temperature measuring device of the present invention was conceived.

As shown in FIG. 1, a large number of temperature measurement parts 11,
Optical fiber 2 with tips oriented toward 12, 13, and 14
1, 22, 23, 24 and the optical switching device 15, the color temperature is measured one by one, in a time-division manner, using the light rays radiated from each temperature-measuring portion 11, 12, 13, 14. It is equipped with an optical system that allows the light to enter the device. This optical switching device 15 is driven by a motor 17 via an intermittent feeding means 16 such as a Geneva gear, and a movable piece 18 is connected to each optical fiber 2.
The optical fibers 1, 22, 23, 24 are stopped for a long period of time, and the optical fibers 21, 22, 23, 24 are moved for a short period of time. There is.

The human light beam selected by this optical switching device 15 is guided to the photoelectric conversion element 1 by an optical system having two types of filters 25 and 26 with different passing wavelengths, and guided to the photoelectric conversion element 1 through a rotary filter 27 rotated by a motor 28. A two-phase alternating current generator 29 is connected to the motor 28 in addition to the rotary filter 27 .

On the other hand, the optical switch 15 includes a switch 19 that opens and closes in conjunction with the movable piece 18 in order to generate signals C ₁ , C ₂ , C ₃ , and C ₄ corresponding to the optical fibers being connected.
Further, a gate signal generator 5 is provided which generates a gate signal D for a certain period of time after the movable piece 18 is connected to a selected optical fiber.

The output A of the photoelectric conversion element 1, into which the light beam that has passed through the optical switching device 15 and the rotary filter 27 is incident, is guided to the first gate circuit 3 via the amplifier 2, and this first gate circuit 3 has a two-phase From the alternating current generator 29, two types of filters 25 and 26 with different passing wavelengths are connected.
One gate signal _B2 corresponding to is applied, and the output passing through this first gate circuit 3 is
It is used to control the gain of the photoelectric conversion element 1 via the automatic gain control circuit 4.

Each output of the switch 19 linked to the optical switching device 15
C ₁ , C ₂ , C ₃ , and C ₄ are connected to the first AND circuits 31 and 3, respectively, along with the output D of the gate signal generator 5.
2, 33, and 34, and each output E ₁ , E ₂ , E ₃ , and E ₄ of the first AND circuits 31, 32, 33, and 34 are paired in pairs. The signals are applied to second and third AND circuits 41 and 51, 42 and 52, 43 and 53, and 44 and 54, respectively.

The first output B ₁ from the two-phase AC power generator 29 corresponding to the filter 25 is applied to the second AND circuits 41, 42, 43, 44, and the third AND circuit 51, 52, 53, 54 is the second output from the two-phase alternator 29 corresponding to the filter 26
B ₂ is applied.

The output A of the amplifier 2 is the first
and second sample and hold circuits 61 and 7
1, 62 and 72, 63 and 73, 64 and 74, and the outputs F ₁ , F ₂ , F ₃ , F ₄ of the second AND circuits 41, 42, 43, 44 are the first sample and hold circuits. It is applied as a sampling pulse to the circuits 61, 62, 63, 64, respectively, and the output G ₁ , of the third AND circuit 51, 52, 53, 54,
G ₂ , G ₃ , and G ₄ are applied as sampling pulses to second sample-and-hold circuits 71, 72, 73, and 74, respectively.

Paired first and second sample and hold circuits 61 and 71, 62 and 72, 63 and 73,
Each output of 64 and 74 H ₁ and J ₁ , H ₂ and J ₂ , H ₃ and J ₃ ,
H ₄ and J ₄ are dividing circuits 81, 82, 8, respectively.
3, 84, and each output of each of these dividing circuits is applied to the indicators 91, 92, 93,
94 respectively.

Even if the optical switch 15 is connected to the optical fiber 21, the automatic gain control circuit 4 will operate and the output A of the amplifier 2 will not stabilize until a certain period of time T has elapsed. When the output of signal E 2 becomes stable, the gate signal generator 5 generates the output D, and the first AND circuit 31 generates the signal E ₁ only during the sampling period.

During the period in which the first AND circuit 31 is generating the output E ₁ , the outputs B ₁ and B ₂ of the two-phase alternating current generator 29 corresponding to the two types of filters 25 and 26 are generated in the second and third AND circuits. The pulses are applied as sampling pulses F ₁ and G ₁ to sample and hold circuits 61 and 71 via circuits 41 and 51 .

During the period when the sampling pulse _F1 is applied, the passing wavelength λ of the filter 25 is transmitted by the amplifier 2.
It generates an output corresponding to the intensity of the light beam of ₁ ,
The sample and hold circuit 61 samples the peak value and holds it until the next cycle. Similarly, during the period when the sampling pulse G ₁ is applied, the amplifier 2 generates an output corresponding to the intensity of the light beam with the wavelength λ ₂ passing through the filter 26, and the sample and hold circuit 71 calculates the peak value of the output. is sampled and held until the next period.

By performing such a series of operations, the optical fiber 3
A signal H 1 , whose level corresponds to the intensity of the components of wavelengths λ ₁ and λ ₂ among the light rays guided through H ₁ ,
J ₁ is a pair of two sample and hold circuits 6
1 and 71 are held for one cycle, so when these signals H ₁ and J ₁ are divided by the division circuit 81, an output corresponding to the ratio of the two, that is, an output corresponding to the color temperature is obtained. Therefore, this is indicated by the indicator 91 as the color temperature.

Above, the process of obtaining the color temperature of one object to be measured 11 by the light beam guided through one optical fiber 31 has been explained, but when the other optical fibers 32, 33, 34 The same process is applied to the light beams guided through the indicator 9.
2, 93, 94 each temperature measured object 12, 13, 14
The color temperature can be specified, and each of these specified values is sequentially updated in a time-sharing manner.

According to the color temperature measuring device of the present invention configured as described above, it is possible to measure the temperature of many parts with a single temperature measuring device, so that each measurement value is based on a common standard. Based on this method, processing or utilization of measurement data becomes convenient, and the cost of the device can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of an AND circuit color temperature measuring device, and FIG. 2 is a timing chart used to explain the operation of the device shown in FIG. 5...Gate signal generator that generates a gate signal during the stable period, 11-14...Temperature measured portion, 21
~24...Optical fiber, 15...Optical switching device, 61~
64, 71-74...sample/hold circuit,
81-84...Division circuit, 91-94...Indicator.

Claims (1)

[Scope of Claims] 1. A plurality of optical fibers that respectively guide light rays from a plurality of temperature-measured portions; an optical switch that sequentially connects one of the plurality of optical fibers to a color temperature measuring means; means for guiding the output of the color temperature measuring means to a plurality of sample-and-hold circuits in synchronization with the optical switching device; sample·
A color temperature measuring device comprising: means for applying a sampling pulse to a hold circuit;