JPS5852531A - Color pyrometer - Google Patents

Abstract

PURPOSE:To digitally display a temperature of a substance whose temperature is measured, by obtaining a ratio of electric signals corresponding to intensity of light beams having 2 differece wavelength, in a light beam radiated from the substance whose temperature is measured, by use of a V/F converter and a counting circuit. CONSTITUTION:A light beam radiated from a substance T whose temperature is measured is made to pass through 2 kinds of filters f1, f2 whose passing wavelength is different, is amplified H through a photoelectric converting element D, and after that, is inputted to the first and second V/F converters V1, V2 through a separator K and smoothing circuits E1, E2, and is converted to frequency. Also, this color pyrometer is provided with the first counting circuit U1 for generating an output whenever outputs of both these converters V1, V2 are counted by a specified number, the second counting circuit U2 for counting an output of the second V/F converter V2, and an indicator I for displaying the counting contents of this counting circuit U2.

Description

[Detailed Description of the Invention] This invention applies the fact that the energy radiated from a black body at a certain temperature varies depending on the wavelength according to Winn-Blank's law. Regarding color temperature, which determines temperature, in particular, it is configured to digitally display one color temperature by performing a division operation to obtain the ratio of the intensity of radiant energy of two different wavelengths using a counting circuit.

As shown in Part 1, the light receiving lens (N) 1 that focuses the light rays (energy) radiated from the temperature measurement object (T) has two types of filters (f,) with different passing wavelengths.

(f2) and an optical system including a rotary filter (F) rotated by a motor (M), and the light rays that have passed through these optical systems are incident, and the incident light is present.

Furthermore, a two-phase alternating current generator (G) generates a two-phase alternating current switching signal synchronized with the rotation of the one-rotation filter (F), and this switching signal is used to switch the output (0) of the amplifier (H) into two. A separator () that separates the light rays that have passed through the seed filters (f,) and (f2) into two output ways (A,) and (B) corresponding to the intensity
K) and each output (A) separated by 1.

A smoothing circuit (E
, ), (E,) and these two smoothing circuits (■su, (E,)
2) is equipped with a /F converter (V, ), f12) that converts the DC level of each output into a frequency, respectively.

The output of the first "/F converter ff,) is connected to the input of the first counting circuit (Ul). This first tt
When the number circuit (U,) counts a certain number of pulses until overflow occurs, an output is generated from the overflow terminal (0), and the count value returns to zero.

The output of the second o V/F converter (2) is connected to the input of the second counting circuit (U,). The count output of this second counting circuit (U2) is connected to a latch circuit (L) that holds the count value.

The overflow output (0) of the first counting circuit (Ut) is connected to the trigger terminal of a monostable multivibrator (J), and the output of this monostable multivibrator (J) is connected to the second counting circuit (U2). It is connected to the clear terminal ((3L)) and the enable terminal (2) of the latch circuit (L).

This latch circuit (L) is a decimal converter (Do
) to the numeric display (I).

Next, the operation of the color thermometer of the present invention configured as above will be explained.

A rotating filter (
F) and enters the photoelectric conversion element (D) into the amplifier (H).
Since the output is amplified by the waveform shown in Figure 2 (3VC), it is sent to the separator (K) and then connected to the two-phase alternating current generator (
Two types of filters (r,) using the switching signal from G)
, the peak value a corresponding to the intensity of the ray passing through (f,)
, b into two outputs (Fig. 2 A, B) and smoothed by smoothing circuits (B, ) and (Bt), respectively, the DC voltages al and bl proportional to the peak values a and b are respectively /F converters (■1) (■t) convert them into signals with frequencies aIf and bIf proportional to DC voltages a' and b'.

The output of the first ■/F converter (■,) is counted by the first counting circuit (Ul) that counts a fixed number, and every time a fixed number is counted, multiple outputs are output from the overflow terminal (0). arise. The period (z) at which this overflow fi((O) produces multiple outputs is inversely proportional to the DC voltage a that is the output of the smoothing circuit (El).

The output of the second tv V/F converter (■2) is
The first counting circuit (Ul) generates a geobar flow output (0).
2), and the overflow output (0
), the count value of the second counting circuit (U, ) is held in the latch circuit (L).

The second counting circuit (U,) is cleared.

The count value of this second counting circuit (U,) is calculated by the smoothing circuit (B
,) is proportional to the DC voltage S which is the output of
Proportional. In other words, this is proportional to the DC voltage 1, inversely proportional to the DC voltage 1, and corresponds to the ratio b/ of the two, that is, the two types of filters (f,) and (f,)
It corresponds to the color temperature, which is the ratio of the intensity of the light rays that pass through it.

In this way, the second counting circuit (U,) corresponding to 9 degrees of inclusivity
The count value is held in a latch circuit (L).

Numerical display (I) via decimal converter (DO)
is displayed.

As explained above, according to the color thermometer of this invention,
The ratio of electrical signals corresponding to the intensities of two different wavelengths of light rays radiated from the object to be measured (T) is:
The temperature can be obtained using a V/F converter and a counting circuit, and the ratio can be converted into the color temperature of the object to be measured and displayed digitally.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram showing an embodiment of the color thermometer of the present invention, and Fig. 2 is a waveform diagram used to explain the operation of the device shown in Fig. 1. It is. T...Temperature-measuring object fl*'2...Two types of filters with different passing wavelengths D...Photoelectric conversion element K.・・・・・・・・・Separator V,,V2・・・・・・・・・・■/F converter U,,U
2・・・・・・・・・Counting circuit L・・・・・・Latch circuit■・・・・・・Numeric display

Claims (1)

[Scope of Claims] Means for converting the intensities of light rays of two different wavelengths among the light rays radiated from the object to be temperature measured into first and second electrical signals. first and second V/F converters that convert the two signals converted by the means into frequencies, respectively; a first counting circuit that generates an output when the output of the first /F converter is counted by a certain number; a second counting circuit that counts the output of the second V/F converter over the period in which the first counting circuit generates an output; a display device that displays the counting contents of the second counting circuit; A color thermometer comprising: