JPS5833133A - Thermometer - Google Patents

Abstract

PURPOSE:To perform the measurement of temperature in a short time without the reduction in precision, by determining temperature of an object to be measured by forecasting the rising pattern of the temperature. CONSTITUTION:The sample value of detected temperature by a temperature-sensitive body 1 through an A/D converter 2 is compared with contents of memories 4-6, 7-9 in a group which store temperature, corresponding to the given time of the rising pattern of a given temperature, at each given timing through the working of coincidence circuits 10 via a timing signal generating circuit 3. Temperatures, which coincide with each other resulting from said comparison, are stored in memories 11-13 and 14-16 corresponding to the group, and the temperature rising pattern is forecasted in a short time to display temperature, corresponding to the forecasted pattern, in a temperature display unit 19. This eliminates the need to wait until an instruction numeral is brought to an unchanging state, and enables to perform a measurement of temperature in a short time without reduction in precision.

Description

[Detailed description of the invention] This invention relates to a thermometer.

(1) When measuring the temperature of an object to be measured, a conventional thermometer is designed such that the indicated value (ie, the saturation value) when the temperature no longer rises indicates the temperature of the object to be measured.

Therefore, when measuring the temperature of an object to be measured using a conventional thermometer, the measurement state must be maintained until the indicated value no longer increases, and measurement takes a relatively long time.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above. Utilizing the fact that temperature is uniquely determined, it is possible to predict the rising pattern of the indicated value within a relatively short period of time without waiting until the indicated value no longer increases, and respond to this rising pattern. The object of the present invention is to provide a thermometer that uses the temperature of the object to be measured as the temperature of the object to be measured.

FIG. 1 is a graph diagram for explaining the invention in detail, with time on the horizontal axis and temperature on the vertical axis, and examples of rising patterns of indicated values when sensing each temperature. vinegar. For example, when a certain temperature sensing element is brought into contact with an object to be measured at a temperature of 100°C, the indicated value increases along a certain curved trajectory as shown by the thick line, and finally reaches a value of 100°C. This locus, that is, the temperature rise turn, remains the same unless the temperature of the object to be measured changes because, for example, the coefficient of expansion of the capacitance of the temperature sensing element with respect to heat is fixed.

When measuring the temperature of a measured object by first sensing the temperature at 100°C and sampling and measuring the rising indicated value at regular time intervals, the rising indicated value will be the same as the one measured first. If you sample and measure at the same time interval and each sample value matches the corresponding sample value at a temperature of 100°C, there is no need to wait for the final indicated value, and the indicated value based on the temperature of the object to be measured will be the final value. target 10
It is predicted that the temperature will reach 0°C.

In Figure 1, if to is the time when the indicated value starts to rise, then
Even if measurements are not made up to time t0, if measurements are taken up to, for example, +5, the final instruction value can be predicted, and the time from +5 to 1t11 can be shortened.

FIG. 2 is a circuit diagram showing an embodiment of the present invention, in which (1) is a temperature sensing element, and (2) is an analog-to-digital converter that converts the indicated value from the temperature sensing element (1) into a digital signal. , (3) is a timing signal generator that generates a time signal at regular time intervals, and (4), (5), and (6) form one group and are sensitive to a predetermined temperature, for example, 50°C. Temperature rise pattern with respect to 50°C, which is converted into a digital signal by the converter (2) using sample values at fixed time intervals based on the time signal from the signal generator (3) of the increasing indicated value when A memory for storing the digital value of (7),
(8) and (9) also form one group; for example, when the temperature is sensed at 100°C, the converter uses sample values at fixed time intervals based on the time signal from the signal generator (3) of the increasing indicated value. This is a memory that stores what has been converted into a digital signal by (2), that is, the digital value of the temperature rise pattern for 100°C. Second
Figure 1 shows an example in which two groups of sample values are stored, one when the temperature is sensed at 50°C and the other when the temperature is sensed at 100°C, that is, two types of temperature rise patterns are stored. λ is configured to store respective temperature rise patterns when sensing temperatures closer to each other such as 50°C, 60°C, 70°C, and so on. OQ is memory (4), (5), (6),
The sample values stored in (7), (8), and (9) and the indicated value that increases when the temperature to be measured is detected at fixed time intervals based on the time signal from the timing signal generator (3). A matching circuit, α]) , U , (13, Q 脣), which checks the coincidence of each sample value with that which is being converted into a digital signal by the converter (2).

Negative →, αQ is the memory for each matching (b) path αQ confirming the match and storing the error, α′? ) Fi memory < 11).

(6), AND gate that takes the AND of all the outputs of negative 1, Kanhamomemo IJ (14, (C), AND gate that takes the AND of all the outputs of 06, (to) is the AND gate αη, a This is a temperature display that displays the temperature value based on the output from
0°C is displayed.

The value indicated by the thermosensor (1) is converted into a digital signal by the converter (2), and the time signal from the signal generator (3), which is emitted at fixed time intervals, is sent to the matching circuit corresponding to that time. The matching circuit α0 checks whether the signal from the converter (2) matches the signal stored in the memo 4+, (5), +6), and determines if they match. If so, the corresponding memory 01)
.

), stored in 03.

Memo +) (7), (8), (9) A similar check is performed on the stored signals, and if they match, the corresponding memory 0, α! 9. (1fHC is stored.

AND gate 0 which represents the AND of all outputs of memory (111, H, Qj spanning α→, (to), α expansion
A value determined by the output of η or 08 is displayed on the temperature display 0 scratch.

As described above, the present invention has the advantage that the temperature of the object to be measured can be measured with relatively high accuracy and in a short time.

[Brief explanation of the drawing]

Figure 1 is a 797 diagram that explains and explains the principle of this invention.
FIG. 2 is a circuit diagram showing an embodiment of the present invention. In the figure, (1) is a temperature sensor, (2) is an analog-to-digital converter, (3) is a timing signal generator, and (4!'
, (51. (6), (7”l, (8), (9) F'
i memory, HQ Vi matching circuit, 0υ, 04°α3,
04, (to), α*#-i memory, αη, Q9Fi AND gate, α scratch is a temperature indicator. Agent Shin Kuzuno −

Claims (1)

[Claims] A temperature sensing body outputs a physical quantity corresponding to the temperature sensed as an analog signal, an analog-to-digital converter converts the analog signal into a digital signal at a predetermined sampling period, and the temperature sensing body A memory that stores each temperature rise pattern when the temperature is sensed as a digital value at each predetermined sampling period, and an output of the analog-to-digital converter when the temperature sensing element senses the temperature to be measured. A thermometer comprising means for detecting which pattern among the temperature rise patterns stored in the memory matches a pattern.