JP2002071604A - Method for measuring humidity change - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for measuring humidity change capable of measuring the amount of change in detected humidity easily and accurately in various conditions. SOLUTION: With respect to a temperature sensor to be used, the values of sensor output at changing temperature in a measurement environment are found as map humidity. Map humidity at temperature Tn at a present time point is designated as Dm[Tn], map humidity at temperature Tn-x at a past time point as Dm[Tn-x], detected humidity at the present time point as Dn, and detected humidity at the past time pint as Dn-x. Assumed humidity Dt is found from Dt=Dn-x+(Dm[Tn]-Dm[Tn-x]). A correction humidity increment Din, which is an increment in actually detected humidity Dn at the past time point and at the present time point, is found from Din=|Dt-Dn|.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a change in humidity using a humidity sensor for correcting a change in temperature.

[0002]

2. Description of the Related Art Conventionally, when detecting the amount of water vapor contained in the atmosphere or the amount of water vapor in a closed space such as in a sealed container as relative humidity, various hygrometers or humidity sensors can be used. .

[0003]

However, for example, when measuring a change in humidity at a specific detection site which is not an enclosed space, such as measurement of the amount of sweat in a patient, the conventional hygrometer or the conventional hygrometer is used. Using a humidity sensor has the following problems. That is, the detected humidity of a specific detection site is affected by a change in temperature or the like in an environment around the detection site. In particular, the influence is large due to a change in the relative humidity due to a change in the amount of saturated steam at each temperature as the temperature changes. That is, the detected humidity of the detection site becomes a value affected by the change in the relative humidity.

[0004] Therefore, when measuring the detected humidity at the detection site, it is necessary to keep the temperature and humidity in the surrounding environment where the measurement is made constant. Therefore, measurement is performed by supplying a dry gas having a certain temperature and humidity to the detection site.
However, in this method, it is necessary to always supply a dry gas to perform the measurement, and the environment in which the measurement is performed is limited. Also, in this method, no consideration is given to the instrument error of the humidity sensor itself.
The detected humidity becomes a value including this error.

[0005] As another method, two humidity sensors are used, one of which measures the detected humidity of a detection site, and the other of which measures the humidity of the surrounding environment. A method of calculating the actual detected humidity while always taking into account the change in humidity is considered. However, in this method, not only two humidity sensors are required, but also a difference in temperature characteristics between the two humidity sensors needs to be adjusted, and this operation is difficult.

The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a method for measuring a change in humidity which can easily and accurately measure a change in humidity under various environments. Things.

[0007]

According to the first aspect of the present invention, a method of
Measures the change in detected humidity between the point and the current point
Measurement of the humidity sensor used
Map the sensor output value due to temperature changes in the environment
Temperature T_nThe above
Up humidity to Dm [T_n], Temperature T in the past_nxTo
The above map humidity in Dm [T_nx] And
The detected humidity at the present time is D_n, Above the past point
The detected humidity is D _nxAnd the assumed humidity Dt, Dt =
D_nx+ (Dm [T_n] -Dm [T_nx])
Therefore, the actual time between the past and the present
Corrected humidity change amount Dr, which is the change amount of detected humidity_nTo Dr
_n= D_n−Dt
In the measuring method.

The most remarkable point in the present invention is that, for a humidity sensor to be used, a sensor output value accompanying a temperature change in an environment around the detection site is obtained as a map humidity, and the actual humidity value is calculated from the assumed humidity Dt. it is to obtain the correction amount of humidity change Dr _n is a change amount of the detected humidity.

The detected humidity, the sensor output value,
The map humidity, the assumed humidity, and the corrected humidity change amount can all be expressed as relative humidity [%]. Further, the humidity sensor according to the present invention is not a hygrometer used to measure the relative humidity [%] representing the amount of water vapor contained in the atmosphere, but separately measures the relative humidity [%] of a specific detection site. Sensor used for measurement.

Next, the operation and effect of the present invention will be described.
In the present invention, before measuring the humidity of the detection site,
For a humidity sensor to be used, a sensor output value associated with a change in temperature under a measurement environment is obtained in advance as a map humidity. More specifically, the map humidity is obtained by leaving a humidity sensor in an environment containing a predetermined amount of moisture, changing the temperature in the environment, and recording the changed temperature and the sensor output value at the temperature. Create by doing. Note that the map humidity includes factors such as changes in relative humidity due to changes in the amount of saturated water vapor at each temperature due to temperature changes in the measurement environment, and changes due to temperature characteristics of the humidity sensor itself and instrument errors. It is thought that there is.

Then, the detected humidity at the detection site is measured. At this time, if there is a temperature change in the environment around the detection site, the detected humidity is affected by the change in the relative humidity and the change in the humidity sensor itself, and has a value with an error. Therefore, in the present invention, first, the values of the map humidity at the respective temperatures at the past time and the present time are read, and the difference between the map humidity at the present time and the past time is added to the detected humidity at the past time.

Specifically, the detected humidity D at a past time point
to _n-x map humidity of the difference _{(Dm [T n] -Dm [} T
_nx ]) to obtain an assumed humidity Dt. This assumed humidity Dt is assumed to be measured as a change in humidity relative to a temperature change at the present time if the detected humidity at the detection site does not change when the temperature changes from the past time to the present time. Indicates possible humidity.

[0013] Then, the correction amount of humidity change Dr _n is a change amount of the actual detection humidity at the past time and the current,
Obtaining a difference between the detected humidity D _n and the assumption humidity Dt of time. In this way, when there is a change in temperature up to the present time from the past time, to correct the amount of change in the map humidity with changes in temperature, changes in the actual detected humidity as a correction amount of humidity change Dr _n The quantity can be determined. Therefore, the amount of change in humidity can be accurately measured without being affected by a change in temperature.

[0014] Incidentally, as if the value of Dr _n is when it is negative, the actual detected humidity is increased, whereas, Dr
_When the value of _n is positive, it can be detected as a case where the actual detected humidity decreases. Further, needless to say, if there is no temperature change between the past time and the current detection assumption humidity Dt is the past time humidity D _n-x becomes _{(Dt = D n-x)} , the correction amount of humidity change Dr _n is a difference between the detected humidity _{D n-x} of the past time and the detected humidity _{D n} at the present time _{(Dr n = D n -D n} -x).

The above-mentioned map humidity is created using a humidity sensor used for measuring the detected humidity. Therefore, it is not necessary to prepare a humidity sensor other than the humidity sensor for measuring the detected humidity when creating the map humidity. Also, when measuring the detected humidity, the measurement can be performed with one humidity sensor. Therefore, it is not necessary to adjust the temperature characteristics between the two humidity sensors as in the related art, and the amount of change in humidity can be easily measured.

Further, in the present invention, the change in relative humidity in the environment around the detection site due to the temperature change is corrected to determine the actual change in detected humidity. Therefore, the measurement can be performed without using a dry gas having a constant temperature and humidity as in the related art. Therefore, the environment in which the measurement is performed is almost unlimited,
Measurement can be performed in various environments.

It is considered that the map humidity is a value including the temperature characteristics of the humidity sensor itself and an instrument error. Therefore, at the time of measurement, it is possible to obtain the actual amount of change in the detected humidity by correcting the temperature characteristics of the humidity sensor itself and errors due to instrument errors. Further, if the map humidity is created for each humidity sensor, it is possible to correct the temperature characteristic and the instrument error with respect to the temperature of each body, and it is possible to measure the change amount of the detected humidity more accurately. .

Further, the amount of change in the detected humidity can be calculated by converting the amount of change in the detected humidity into the absolute humidity at the detection site to be detected. Therefore, it is possible to accurately detect the amount of change in moisture without being affected by a change in temperature. The past point in time may be a point in time that is a predetermined time elapsed from the current point in time, and may be changed at predetermined intervals, or may be updated at predetermined time intervals at the beginning of the measurement. May be performed, or may be the same as the time when the measurement is started at the beginning until the measurement is completed.

As described above, according to the present invention, it is possible to provide a humidity change measuring method capable of easily and accurately measuring a humidity change amount under various environments. The method of measuring the change in humidity described above can be used in various detection sites such as, for example, detection of humidity of various gases in a factory, detection of humidity of various specific portions in a room, and detection of humidity in a human body and a plant. it can.

Next, the invention described in claim 2 is based on the past
Measures the change in detected humidity between the point and the current point
Measurement of the humidity sensor used
Map the sensor output value due to temperature changes in the environment
Temperature T_nThe above
Up humidity to Dm [T_n], The detection humidity is zero
Temperature T at the time of leaving_nxThe above map humidity at Dm
[T_nx] And the detected humidity at the present time is
D_n, The detected humidity at the past time is D _nxage
Therefore, the assumed humidity Dt is given by Dt = D_nx+ (Dm [T_n]
−Dm [T_nx]), The past time and the above
The supplementary value, which is the actual increase in the detected humidity
Positive humidity increase amount Di_nTo Di_n= | Dt-D_n|
And measuring the humidity change.

Next, the function and effect of the present invention will be described.
Also in the present invention, the map humidity and the assumed humidity Dt can be created or obtained in the same manner as in the above invention. Then, the corrected humidity increase amount Din which is the actual increase amount of the detected humidity between the past time point and the present time is _expressed by:
Obtaining an absolute value of the difference between the detected humidity D _n assumptions humidity Dt and the current. That is, in the present invention, the time point detected humidity is zero as the past time point, determining a correction humidity increase Di _n of current. Therefore, by converting the corrected humidity increment Di _n in the variation of the absolute humidity, it is possible to calculate the amount of change in moisture.

The amount of change in water can be integrated to calculate the amount of water actually generated.
Therefore, in the method of measuring a change in humidity according to the present invention, the amount of change in detected humidity can be easily and accurately measured under various environments without being affected by a change in temperature in the same manner as in the above invention.

Next, as in the third aspect of the present invention, the temperature and the map humidity in a range where the sensor output value cannot be measured are approximated by a gradient of the sensor output value with respect to the temperature in the measured range. Approximately determined map humidity can be used. Thereby, the creation of the map humidity can be simplified.

Next, it is preferable that the above-mentioned method for measuring a change in humidity is used for measuring a change in the amount of perspiration. Thus, it is possible to accurately measure a change in the amount of sweating in the human body. Such measurement of the change in the amount of sweating is performed, for example, when detecting the sweating state of a patient in a hospital, or in various human body environments such as sleep, work, and exercise in a healthy person, the natural environment and the human body environment. For example, it can be used to detect changes in the amount of sweating of the human body under various conditions.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A method for measuring a change in humidity according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 (a), (b)
As shown in the measurement method of the humidity changes in this example, the particular detection site for detecting the humidity, measuring the change in detected humidity D _n of the and the current past time. When performing the measurement,
Advance obtained as maps humidity Dm [T _n] a sensor output value with changes in temperature T _n in the measurement environment.

Next, after starting the measurement of the detected humidity _{D n,}
At the present time being measured, as it follows determine the actual detected humidity D _n is an increase amount of the correction humidity increase Di _n between the past time and the current. That is, first, the map humidity Dm temperature _{[T n]} is, calculated in - humidity than the corresponding map, the map humidity Dm at a temperature _{T n} at the present time
_[T n], and reads the map humidity Dm _{[T n-x]} at the temperature _{T n-x} of the past time. Then, the detected humidity _{D n} at the present time which was measured, and using the detected humidity _{D n -x} the past time, the assumption humidity _{Dt, Dt = D n-x} +
_{(Dm [T n] -Dm [} T n -x]) determined from the correction humidity increment Di _n, Di _n = | determined from | _{Dt-D n.}

The details will be described below. As shown in FIG. 2A, the method of measuring a change in humidity in this example is used, for example, when measuring a change in the amount of sweating of the human body 2 as a patient. The sweating amount detection device 1 has a humidity sensor 12 composed of a humidity detecting capsule 121 and a humidity sensor main body 122, a thermometer 13, an arithmetic unit 14, and a display 15 for displaying the sweating amount.

The humidity detecting capsule 121 is attached to the skin of the human body 2 and detects the sweat 21 generated from the human body 2. The ventilation gas is supplied to the humidity detection capsule 121 at a constant flow rate.
Detecting a change in the detected humidity D _n in blowing gas discharged from the humidity detecting the capsule 121. Humidity sensor body 122
It is connected to the processing unit 14 transmits the data of the detected humidity D _n to the arithmetic unit 14. The thermometer 13, the detection unit 131 is connected to the processing unit 14 is arranged closer to the vicinity of the humidity detecting capsule 121, it transmits the data of the temperature T _n detected in the arithmetic unit 14.

The arithmetic unit 14 stores a temperature-humidity correspondence map indicating the correspondence between the map humidity and the temperature, and can be rewritten as needed.
Further, the arithmetic unit 14, arithmetic expression is constructed for determining the assumptions humidity Dt and correction humidity increment Di _n or the like by a computer program. And the arithmetic unit 14
The temperature - humidity correspondence map, the temperature T transmitted from the detected humidity D _n and temperature gauge 13 is transmitted from the humidity sensor 12
The _n, seek the actual amount of increase in detected humidity D _n correction humidity increment Di _n. Then, the correction humidity increase the amount of Di _n
Is converted into the amount of increase in water to determine the amount of perspiration.

Further, the arithmetic unit 14 is connected with a display unit 15, the display unit 15, the correction humidity increment Di _n
Is displayed.
Note that, as shown in FIG. 2B, the arithmetic unit 14 and the display 15 may be integrally formed with the humidity sensor main body 122.

Next, a method of creating a temperature-humidity correspondence map will be described. As shown in FIG. 1 (a), in this example, before the measurement of the detected humidity D _n of the detection site, in advance, the humidity sensor 12 to be used, the sensor output due to the change in temperature T _n of the measurement environment Map the value to the map humidity Dm [T
_[n ] is created in advance. The temperature - humidity corresponding map and left a humidity sensor 12 in an environment containing a predetermined amount of water, and the temperature T _n in which the temperature T _n of the environment is changed, then the change,
The sensor output value at temperature T _n is created by recording.

The map humidity Dm [Tn] in the range where the temperature _Tn and the sensor output value cannot be measured (the range of T1 and T3 in FIG. 1A) is the range _where the measurement was performed (FIG. 1A )
Both ends a of the map humidity Dm [T _n ] of the range T2 in the middle)
1, it is possible to approximate map humidity Dma obtained an approximation than the slope [T _n] for the temperature of the sensor output value at a3. It should be noted that the approximate map humidity Dma _[T n]
Is the correction changes in humidity increment Di _n check with the, use the value of the correction humidity increment Di _n, obtained using a map humidity Dm _{[T n],} an approximate map humidity Dma _{[T n]} be corrected when the significant difference is seen between the value of the correction humidity increment Di _n determined Te is preferred.

The map humidity Dm [T_n]
Environmental temperature T_nTemperature T_nSaturated water vapor
Changes in relative humidity due to changes in volume and humidity sensors
Factors such as temperature characteristics of 12 itself and changes due to instrument errors
It may be included. In addition, temperature-humidity
The map is based on the temperature T_n
And map humidity Dm [T_n] Is preferable.
No. In this case, a more accurate temperature-humidity map
Can be created. In this case, the map
Degree Dm [T_n], And the map humidity Dm [T_nx]
Current detection humidity D _nAnd the detected humidity D in the past
_nxFrom the temperature-humidity correspondence map with
Reading is preferred.

[0034] Next, a method for obtaining the correction humidity increment Di _n by perspiration in living 2. Set and the temperature of the perspiration amount detecting device 1 - after the creation of the humidity correspondence map is performed, the temperature T _n in the environment surrounding the detected humidity D _n and the detection site is the amount of perspiration change in the detection site
Start measurement. This measurement is performed at a predetermined sampling cycle. Further, the detected humidity D _n is assumed because it uses when determining the humidity Dt and correction humidity increment Di _n, successively stored to the arithmetic unit 14 after the measurement. During the measurement, when a change in temperature T _n is in the environment surrounding the detection site, the detected humidity D _n is influenced by changes and the humidity sensor 12 itself changes in the relative humidity, with error Value.

Therefore, first, in the arithmetic unit 14,
Temperature - from humidity correspondence map, maps humidity Dm at a temperature _{T n} at the present time _[T n], and the temperature T of the past time
reading the map humidity Dm _{[T n-x]} in _n-x (see Figure 1 (a)). Note that, in this example, the past point in time is initially set as the point in time when the measurement is started, and is updated every hour. Next, the detected humidity D _nx at the past time is
Map humidity of the difference _{(Dm [T n] -Dm [} T n-x])
Is added to obtain the assumed humidity Dt (see FIG. 1B). This assumption humidity Dt is when the temperature T _n is changed from a previous time up to the present time, If there is no change in the detected humidity D _n at the detection site, at the present time, humidity to changes in the temperature T _n Shows the humidity that can be assumed to be measured as a change.

[0036] Then, the correction humidity increment Di _n is an increase amount of actual moisture in and the current past time is determined as the difference between the detected humidity D _n and the assumption humidity Dt of time. In this way, when there is a change in the temperature T _n in the past time up to the current time, to correct the amount of change in the map humidity Dm [T _n] due to the change in temperature T _n, increase of the actual detected humidity as correction humidity increase Di _n can be obtained. Therefore, without being affected by the change in temperature T _n, it is possible to measure the variation of the correct humidity.

The correction humidity increase amount Di will be exemplified below.
A method for obtaining _n will be described. (Case 1) First, the temperature T _nx at the past time is T
_{n-x = 25.02 [℃]} , the detected humidity D of past time
_{n-x is,} D n-x = 9.99 in [%], the temperature _{T n} of the current _time, T n = 25.04 [° C.], the detected humidity D of the current
_{n is} the case where D n = 9.99 [%], obtaining a correction humidity increment Di _n. It is assumed that the temperature-humidity correspondence map is created as shown in Table 1.

[0038]

[Table 1]

[0039] From Table _1, Dm when _{T n-x} is _{25.02 [℃] [T n-} x] is 9.98, _{T n} is 2
Dm [T _n ] at 5.04 [° C.] is 9.94. _{Thus, Dt = D n-x +} (Dm [T n] -Dm
Than _{[T n-x]),} Dt = 9.99 + (9.94-
_{9.98) = 9.95, Di n =} | than, | _{Dt-D n}
Di _n = | 9.95-9.99 | = 0.04 a [%]. In this case, the temperature T _n is rising toward the present time, the case and the D _n-x and D _n are the same. Apparently is no change in the detected humidity D _n, actual correction humidity increment Di _n is determined as being 0.04% increase.

(Case 2) Next, the temperature T at the past point
_nxIs T_nx= 25.02 [° C], past time
Detection humidity D_nxIs D_nx= 9.99 [%]
Temperature T at the time_nIs T_n= 25.00 [° C], current
Detection humidity D_nIs D_n= 9.99 [%]
And the corrected humidity increase amount Di_nAsk for. Dt = D_nx
+ (Dm [T_n] -Dm [T_nx]), Dt =
9.99+ (10.00-9.98) = 10.01, D
i_n= | Dt-D_n|, Di _n= | 10.01-
9.99 | = 0.02 [%]. In this case,
Temperature T_nIs decreasing, but D_nxAnd D_n
Are the same. Apparently detected humidity D_nTo
Although there is no change, the actual correction humidity increase amount Di_nIs 0.02
[%] Demanded as increasing.

(Case 3) Next, the temperature T at the past point
_{n-x is, T n-x = 25.02 [} ℃], the detected humidity _{D n-x} of the past time _is in D n-x = 9.99 [% ], the temperature _{T n} of the current, T _n = 25.04 [℃], detected humidity _{D n} at the present time _is, the case is D n = 9.92 [%], obtaining a correction humidity increment Di _n. Dt _{= D n-x}
+ From _{(Dm [T n] -Dm [} T n-x]), Dt =
9.99+ (9.94-9.98) = 9.95, Di n
= | _{From, Di n = | | Dt-} D n 9.95-9.92
| = 0.03 [%]. In this case, the temperature T _n is increased toward the present time is when the detected humidity D _n is decreased. In this case, actual correction humidity increment Di _n
Is determined as increasing by 0.03 [%].

(Case 4) Next, the temperature T at the past point
_nxIs T_nx= 25.02 [° C], past time
Detection humidity D_nxIs D_nx= 9.98 [%]
Temperature T at the time_nIs T_n= 25.00 [° C], current
Detection humidity D_nIs D_n= 10.00 [%]
The corrected humidity increase Di_nAsk for. Dt = D
_nx+ (Dm [T_n] -Dm [T_nx]), D
t = 9.98 + (10.00-9.98) = 10.0
0, Di_n= | Dt-D_n|, Di _n= | 10.0
0-10.00 | = 0 [%]. In this case,
Temperature T_nDecreases and the detected humidity D_nIncreases
If you are. In this case, apparently the detected humidity
D_nHas increased, but the actual corrected humidity increase Di_nIs
Asked for not changing.

The graphically illustrates the change in correction humidity increment Di _n as described above. That is, the range of T4 in FIG. 1B is when sweating is performed, and the corrected humidity increase amount D
i _n is obtained as a positive value. Also, FIG.
T5 range of (b) is when the sweating is not performed, at first glance, as it appears to the detected humidity is decreasing, indeed almost 0 [%] is corrected humidity increment Di _n is It has been demanded.

Next, further detail for changes in the correction humidity increment Di _n. As shown in FIG. 3 (a), if the temperature T _n in the environment surrounding the detection site is increased, the detected humidity D _n, in the range in FIG T6, actual correction humidity increment Di _n is , for values of the detected humidity D _n, greater amount of sweating can be detected as being performed. Further, the range in the drawing T7, but will exhibit a lower value than when the detected humidity D _n is not performed sweating, actual correction humidity increment Di _n are sweating is not substantially performed Can be detected as

[0045] As shown in FIG. 3 (b), if the temperature T _n in the environment surrounding the detection site is lowered, the detected humidity D _n, in the range in FIG T8, actual correction humidity increase Di _n, relative to the value of the detected humidity D _n, small amount of sweating can be detected as being performed. Also,
In the range in the figure T9, detected humidity D _n as it will exhibit yet value as if perspiration is being performed, the actual correction humidity increment Di _n are sweating is not substantially performed Can be detected.

The correction humidity increment Di _n is an increase in detected humidity D _n obtained as described above, by converting the amount of change in the absolute humidity at the detection site for detecting is the increasing amount of water The amount of perspiration can be calculated. In other words, the amount of perspiration ^{_{A n [g / (m 3}} · min)] is the flow rate of the air gas that is supplied to the humidity detection capsule 121 Q [m
³ / s], and the internal volume of the humidity detection capsule 121 is S
^[M 3], the saturated water vapor amount at the temperature _{T n} of the current H
If [g / m ³ ], it is obtained by the following equation.

[0047] That ^{_{is, A n [g / (m}} 3 · min)] =
(Q [m ³ / s] / S [m ³ ]) × (S [m ³ ] / 1
^{[M 3]) × H [} g / m 3] × Di n [%] / 100,
Omitted ^{_{to, A n [g / (m}} 3 · min)] = Q × H × D
i _n / 100. This gives
Without being affected by the change in temperature T _n, it is possible to detect the change in the precise amount of sweat. In this example, the saturated water vapor amount H is determined by the humidity detection capsule 12.
The inside of 1 was read as 1 atm. In contrast, 1
If the pressure is not the atmospheric pressure, it is read as the saturated water amount H at the atmospheric pressure.

[0048] In this example, the temperature - humidity correspondence map is created using the humidity sensor 12 used to measure the detected humidity D _n. Therefore, the temperature - when creating a humidity corresponding map, there is no need to prepare a humidity sensor other than the humidity sensor 12 for measuring the detected humidity D _n. Further, even when the measurement of the detected humidity D _n, it is possible to measure a humidity sensor 12 of the one. Therefore, it is not necessary to adjust the temperature characteristics between the two humidity sensors as in the related art, and the increase in humidity can be easily measured.

[0049] In the present embodiment, by correcting the change in relative humidity in the environment of a periphery of the detection site with changes in temperature T _n, seeking the increase of the actual humidity. Therefore, the measurement can be performed without using a dry gas having a constant temperature and humidity as in the related art. Therefore, the environment in which the measurement is performed is almost unlimited,
Measurement can be performed in various environments.

It is considered that the temperature-humidity correspondence map has a value including the temperature characteristic of the humidity sensor 12 itself and an instrument error. Therefore, at the time of measurement, the temperature characteristic of the humidity sensor 12 itself and an error due to an instrument error can be corrected, and the actual increase in humidity can be obtained. Further, if the temperature-humidity correspondence map is created for each humidity sensor 12, it is possible to correct the temperature characteristic and the instrument error with respect to the temperature of each body, and to measure the humidity increase more accurately. be able to.

Note that the past time point is a time point that is a predetermined time elapsed from the current time point, and may be changed at predetermined time intervals, or that the above measurement is initially started at the time when the measurement is started. It may be the same until completed.

Embodiment 2 The method of measuring the humidity change in this embodiment is based on the above-mentioned assumed humidity Dt.
, The corrected humidity change amount Dr _n which is the change amount of the actual detected humidity D _n between the past time point and the current time point.
The _obtained from Dr _{n =} D _n -Dt. Incidentally, when the value of Dr _n is negative, as if the actually detected humidity D _n is increased, whereas, when the value of Dr _n is positive, the actually detected as if the detected humidity D _n is decreased can do. Other configurations are the same as those in the first embodiment.

The correction humidity change amount Dr is exemplified below.
A method for obtaining _n will be described. (Case 1) First, the temperature T _nx at the past time is T
_{n-x = 25.02 [℃]} , the detected humidity D of past time
_{n-x is,} D n-x = 9.99 in [%], the temperature _{T n} of the current _time, T n = 25.04 [° C.], the detected humidity D of the current
_{n is} the case where D n = 9.99 [%], obtaining a correction amount of humidity change Dr _n. It is assumed that the temperature-humidity correspondence map is created as shown in Table 1.

As shown in Table 1, T_nxOf 25.02 [° C]
Dm [T_nx] Is 9.98 [%], and T_n
Is 25.04 [° C.]_nIs 9.94
[%]. Therefore, Dt = D_nx+ (Dm
[T_n] -Dm [T_nx]), Dt = 9.99 +
(9.94-9.98) = 9.95, Dr_n= D_n-D
From t, Dr _n= 9.99-9.95 = + 0.04
[%]. In this case, the temperature T_nBut
It is rising, but D_nxAnd D_nIs the same as
is there. Apparently detected humidity D_nDoes not change, but the actual
Corrected humidity change amount Dr_nHas increased by 0.04%
Is required.

(Case 2) Next, the temperature T at the past point
_{n-x is, T n-x = 25.02 [} ℃], the detected humidity _{D n-x} of the past time _is in D n-x = 9.99 [% ], the temperature _{T n} of the current, T _n = 25.00 [℃], detected humidity _{D n} at the present time _is, the case is D n = 9.99 [%], obtaining a correction amount of humidity change Dr _n. Dt _{= D n-x}
+ From _{(Dm [T n] -Dm [} T n-x]), Dt =
9.99+ (10.00-9.98) = 10.01, D
than _{r n = D n -Dt, Dr} n = 9.99-10.01
= −0.02 [%]. In this case, the temperature T _n is decreased toward the present time, the case and the D _n-x and D _n are the same. Apparently is no change in the detected humidity D _n, the actual correction amount of humidity change Dr _n is determined as being 0.02% decrease.

(Case 3) Next, the temperature T at the past point
_{n-x is, T n-x = 25.02 [} ℃], the detected humidity _{D n-x} of the past time _is in D n-x = 9.99 [% ], the temperature _{T n} of the current, T _n = 25.04 [℃], detected humidity _{D n} at the present time _is, the case is D n = 9.92 [%], obtaining a correction amount of humidity change Dr _n. Dt _{= D n-x}
+ From _{(Dm [T n] -Dm [} T n-x]), Dt =
9.99+ (9.94-9.98) = 9.95, Dr n
= From _{D n -Dt, Dr n = 9.92-9.95} = -
0.03 [%]. In this case, the temperature T _n is increased toward the present time is when the detected humidity D _n is decreased. In this case, actual correction amount of humidity change Dr _n is determined as being 0.03% decrease.

(Case 4) Next, the temperature T at the past point
_{n-x is, T n-x = 25.02 [} ℃], the detected humidity _{D n-x} of the past time _is in D n-x = 9.98 [% ], the temperature _{T n} of the current, T _{In the case where n} = 25.00 [° C.] and the current detected humidity D _n is D _n = 10.00 [%], the corrected humidity change amount Dr _n is obtained. Dt = D
_n-x + than _{(Dm [T n] -Dm [} T n-x]), D
t = 9.98 + (10.00-9.98) = 10.0
_0, than _{Dr n = D n -Dt, Dr} n = 10.00-1
0.00 = 0 [%]. In this case, the temperature T _n decreases toward the present time is when the detected humidity D _n has increased. In this case, apparently although the detected humidity D _n are increasing, is determined as not the actual correction amount of humidity change Dr _n changes.

[0058] In this embodiment, as described above, it is possible to determine the actual correction amount of humidity change Dr _n plus and minus. Therefore, in particular, the corrected humidity change amount Dr
_n is effective when calculating the relative humidity of the detection site.
In addition, the same functions and effects as those of the first embodiment can be obtained.

[0059]

As described above, according to the present invention, it is possible to provide a humidity change measuring method capable of easily and accurately measuring a detected humidity change amount in various environments.

[Brief description of the drawings]

FIG. 1A is a graph illustrating a temperature-humidity correspondence map, and FIG. 1B is a graph illustrating a method of detecting a change in humidity, according to the first embodiment.

FIGS. 2A and 2B are configuration diagrams illustrating (a) a perspiration amount detection device and (b) a configuration diagram illustrating another perspiration amount detection device in the first embodiment.

FIGS. 3A and 3B are graphs for explaining a correction humidity increase amount according to the first embodiment, wherein FIG. 3A is a graph for explaining a case where the temperature rises and FIG.

[Explanation of symbols]

 1. . . 11. Sweating amount detector, . . Humidity sensor, 121. . . 122. humidity detection capsule, . . 12. Humidity sensor body, . . Thermometer, 14. . . Arithmetic unit, 15. . . Display, 2. . . human body,

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kiyotaka Fujii 6-Toyota-cho, Toyota-shi, Aichi F-term in Kyoyo Seisakusho Co., Ltd. (reference) 2G040 AA04 BA23 BB04 CA02 CB02 CB03 DA02 GA07 HA16 2G045 AA40 CB09 CB12 DB22 GC30 JA02 2G046 AA09 BJ02 CA02 DC02 DC18 EB07 2G060 AA01 AB02 AE19 AE33 HC02 HC13 HC18 KA04

Claims (4)

[Claims] 1. Detection sites at past time and present time
Method to measure the change in detected humidity
Temperature sensor with temperature change in measurement environment
The sensor output value is determined as map humidity, and the current
Temperature T_nThe above map humidity at Dm [T_n],past
Temperature T at the time_nxThe above map humidity at Dm
[T_nx] And the detected humidity at the present time is
D_n, The detected humidity at the past time is D _nxage
Therefore, the assumed humidity Dt is given by Dt = D_nx+ (Dm [T_n]
−Dm [T_nx]), The past time and the above
The supplementary value is the actual amount of change in the detected humidity
Positive humidity change amount Dr_nTo Dr_n= D_n-Calculate from Dt
A method for measuring a change in humidity, characterized in that: 2. Detection sites at a past time and a present time
Method to measure the change in detected humidity
Temperature sensor with temperature change in measurement environment
The sensor output value is determined as map humidity, and the current
Temperature T_nThe above map humidity at Dm [T_n],the above
Temperature T at a past time when the detected humidity is zero_nxSmell
The above map humidity to Dm [T_nx] And the above
The detected humidity at present is D_n, The above-mentioned inspection
D out humidity _nxIs assumed humidity Dt, Dt = D
_nx+ (Dm [T_n] -Dm [T_nx])
Therefore, the actual time between the past and the present
Corrected humidity increase Di which is an increase in detected humidity_nTo Di
_n= | Dt-D_n| Humidity change characterized by
Measurement method. 3. The method according to claim 1, wherein the map humidity in a range where the temperature and the sensor output value cannot be measured is an approximation obtained approximately from a slope of the sensor output value in the measured range with respect to the temperature. A method for measuring a change in humidity, which is defined as a map humidity. 4. The method according to claim 1, wherein:
The method for measuring a change in humidity is characterized in that the method for measuring a change in humidity is used for measuring a change in the amount of perspiration.