JPS59122929A - Effective hygrometer - Google Patents

Abstract

PURPOSE:To obtain effective humidity at a suitable time, by performing a specified operation with regard to the value of measured humidity memory and fixed coefficients, and displaying the effective humidity. CONSTITUTION:The output of a humidity sensor 1 is controlled by the pulse signal of a control clock 3 and converted into humidity in the range of 0-100% by an AD converter 2. Data comprising 24 values for 24hr for 15 days are stored in memories M0-M14. The sum of the data in each of the memories M0-M14 is obtained and multiplied by corresponding fixed coefficients K0-K14. The results are added and an effective mass He is obtained and displayed on a display recorder 4. Therefore the effective humidity can be determined at any time.

Description

[Detailed Description of the Invention] Although the current humidity can be determined using a hygrometer, it is known that the effects of humidity, such as the risk of fire, are actually influenced by past humidity. It has become common practice to evaluate this as effective humidity. For example, large fires often occur when the air is very dry and the wind is strong. Furthermore, when examining the relationship between large fires and dry air, the drying of the wood itself becomes more of a problem than the drying of the air. The drying of wood has more to do with past air drying than with the current air drying itself. Humidity is used as a measure of air dryness. Therefore, on the same day, /day before. , consider the effective humidity that takes into account the humidity of two days ago, etc., and use it as a guide to determine the degree of dryness of the wood, ie.

You can know the danger rate of fire. What is the effective humidity?

This is the basic data necessary to issue abnormal dryness advisories and fire warnings. For example, in some cities, a fire warning is issued when the effective humidity is below 6θ, the minimum humidity is below qθ, and the maximum wind speed is 7rrys or above, or the wind is expected to blow at an average wind speed of /θm/s or above for 7 hours or more. .

In this way, considering the effective humidity is very effective in estimating the risk of fire. However, in order to know this, it is necessary to understand the changes in humidity up to the present moment and perform calculations, so until now there has been no instrument that can directly display the effective humidity by communicating it with the current humidity measurement value. There was an inconvenience that the current measurement value was always presented with a delay.

The purpose of the present invention is to solve the above-mentioned problems and to make it possible to know the effective humidity in a timely manner. A that receives the electrical signal and converts the electrical signal into a humidity value.
/D converter, an appropriate number of humidity memories that store humidity values at each measurement time, and a coefficient memory that stores a fixed coefficient corresponding to each measurement time, and converts the value of the humidity memory and the fixed coefficient into a predetermined value. This is an effective hygrometer characterized by being able to display the effective humidity at the current measurement time by calculating based on an arithmetic expression. The arithmetic expression used to determine the effective humidity in the present invention that achieves the above object and its concept will be explained.

First, the effective humidity He is determined by the following formula.

He = (/-r) (8g+rH1+r2H2+
・++ +r”Hn) (1) Here, r is a constant, and in a wood fire, θ, 7. In a forest fire, θ, j are used, and H
o is the average humidity of the current day, H is the average humidity 7 days ago, H2 is the average humidity 2 days ago, and Hn is the average humidity n days ago. n
is any number.

Now, considering a wood fire, let r be θ and 7, and use 2Q average humidity of each hour on the hour as the daily average humidity.

Let's calculate the humidity at each hour, (where i is θ, /,, 2...
・), then the practical formula for determining the effective humidity of a wood fire pit can be changed from equation (1). ho is the humidity at a certain hour, hl is the humidity at the hour 7 hours before, h2 is the humidity at the hour 2 hours before, and h7 is the humidity at the hour 7 hours before.

θ3 He=-g (h0+h□+h2+ ,,, +
h23) θ3×θ7 + 2 da (h24+h25+h26+, -10 h
47) θ3Xθ72 + 7 (h4s 10 ham + hs. + ... 10 h7
1) + --- θ3×θ714 2tl (hass+hssy+ hssa+-+b
359) (2) If the humidity at each hour is known from equation (2), the effective humidity He at a certain hour can be calculated. (2
) The first term on the right side of the equation is determined by the humidity of the current day, the second term is determined by /day before, the third term is determined by two days ago, and the 1j term is determined by the humidity at each hour on the hour before /day before sunset. Moreover, since the coefficients applied to each term gradually decrease, the influence on the effective humidity becomes smaller as the value increases in the past, so there is no need to consider an infinite number of terms. For example, if we consider 75 days including the current day, the error in the effective humidity will be smaller than the humidity θ by 5%, and there will be no practical problem. Furthermore, considering 20 days including the current day, the error in effective humidity is:
Humidity θ, / becomes smaller. Therefore, equation (2)
The effective humidity He can be calculated from the calculation.

The present invention will be explained below using examples. The effective hygrometer illustrated in the drawing includes a humidity sensing section 1, an A/D (analog/digital) converter 2, a control clock 3 that controls the operation of the A/[) converter 2, and a measurement point (correct time). Humidity memory for 75 days that stores the humidity values of )'-M6 i Ml
t...M14 and a coefficient memo IJ-ko storing fixed coefficients corresponding to each measurement time point, 1...k14,
It consists of an effective humidity indicator recorder 4 and a humidity indicator recorder 5 at each measurement time.

The humidity seat 1 used was one that constantly outputs a signal voltage of, for example, θ to /■ through an electric circuit due to the expansion and contraction of hair in response to fluctuations in humidity. Other methods that can be used include a method of detecting and calculating each temperature of a rolling bulb and a wet bulb using a platinum wire resistance temperature sensor, or a method of calculating humidity by a combination of dew point temperature measurement and temperature measurement.

In addition, the control clock 3 emits a pulse signal when making a correction, and the A/D
The instruction recorder 5, which operates the converter 2, indicates and simultaneously prints the effective humidity and the current humidity (on the hour).

Now, memo IJ + M. is the humidity h0 to h23 at each hour on the hour on the current day, and Memory M□ is the humidity h24 to h47 at each hour on the hour seven days ago. Memo IJ M2 is the humidity b at each hour two days ago.
4B to h7□, and memo IJ-M□4 is the humidity of each hour on the hour 79 days ago from h336 to h35. 21 each
Assume that you remember each item individually. i.e. ho, b 工, h
2...h3. .

is the humidity at the hour 369 hours before the current hour, with a total of 3
6θ pieces of data (-time x/j days) are arranged in chronological order, starting with the newest data and 7 hours with the oldest data. k
o, k□, 2...k□4 are fixed coefficients, k0=
= 0. J /J'l, J = θ, 3×θ, 7/
, 2g.

k2=θ, 3×θ, 72/, 24t...k14=θ
, 3xθ, 7172&.

The analog output that changes according to the humidity fluctuation of the humidity seat part 1 is
It is controlled by a pulse signal from a control clock 3, and during correction, it is converted into humidity θ to /θθ by an A/D converter 2 and sent to the memory M0. In memory M0, new data is entered in ho.5. The data of bo is sent to hl. More hl
The data in h2 is sent one by one, and the data in h23 is transferred from memory IJ-MO to b24 in M2.
One new piece of data is entered in each memo 1 node, and the oldest data, 2q hours of which have elapsed there, are sent to the next memory M1. Therefore, each memory always contains 2. ri pieces of data (ho~23.h24~
h47...) are stored, their sum is calculated using both equations (2), and a fixed coefficient kO is added to the sum according to each memory.

By multiplying kx, kz...k14 and summing these values, the effective humidity He can be obtained. Then, this instruction is recorded in the instruction recorder 4. On the other hand, the humidity at the hour is recorded in the indication recorder 5.

The above explanation is for the case where the constant r is 0.7, that is, a wood fire, but even in the case of a forest fire, the constant r is set to θ, S, and both equations (
All you have to do is change the coefficients for each term in 2).

In the case of a forest fire, if the past days including the current day are considered, the error in the effective humidity becomes smaller by the humidity θ, DA11, and there is no practical problem. Furthermore, considering the past 70 days including the current day, the error in the effective humidity is 0. / becomes smaller than chi. Therefore, by using g memories M, -M and simply replacing the values of the fixed coefficients in the coefficient memories, the effective humidity for a forest fire can be determined in exactly the same way as described above.

Therefore, according to the present invention, it is possible to obtain the epoch-making effect of being able to know the effective humidity in a timely manner (there is no reason why it is necessary to measure only at the time of correction as in the embodiment) and immediately. Since the actual state of fluctuations in air can be accurately grasped, it becomes possible to issue abnormal dryness advisories and fire warnings in response to meteorological changes such as abnormal weather. Conventionally, calculating the effective humidity using equation (1) requires complicated calculations, which may lead to problems in not losing the timing for issuing alarms. The present invention has the effect of solving these problems and making it possible to perform useful forecasts.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of an effective hygrometer according to the present invention. 1. Humidity window section, 2. A/[) converter, 4.5. Indication recorder, M. Humidity memo IJ, k. Coefficient memory.

Claims (1)

[Claims] A humidity sensor that measures humidity and outputs it as an electrical signal, an A/D converter that receives a signal that determines a measurement point and converts the electrical signal into a humidity value, and an appropriate number of units that store the humidity value at each measurement point. Equipped with a humidity memory and a coefficient memo IJ- storing a fixed coefficient corresponding to each measurement time, the effective humidity at the current measurement time can be calculated by calculating the value in the humidity memory and the fixed coefficient based on a predetermined calculation formula. An effective hygrometer characterized by being able to display.