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Ampere type humidity sensing device

A technology of humidity sensing and humidity sensor, applied in the field of electrochemistry, can solve the problems of nonlinear range of response signal, high instrument cost, poor anti-interference, etc., and achieve the effect of strong anti-interference, simple equipment and convenient production

Inactive Publication Date: 2010-05-19
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an ampere-type humidity sensing device and its application method, so as to overcome the existing need to use AC signals for measurement, which makes the cost of the instrument relatively high, the equipment is complex, the anti-interference is poor, and the response signal is abnormal. Defects such as linear range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of 1-ethyl-3-methylimidazolium bromide

[0042] Under room temperature and stirring conditions, 9.1ml of bromoethane (0.126mol) was slowly added dropwise to 10ml of N-methylimidazole. After 24h, it was washed with ethyl acetate three times, filtered, and vacuum-dried. Reaction equation:

[0043]

Embodiment 2

[0045] Preparation of [1-ethyl-3-methylimidazole][tetrafluoroboric acid] ionic liquid

[0046] Under the conditions of room temperature and rapid stirring, the HBF 4 Acid (15.2cm 3 0.116mol) Slowly add Ag 2 O slurry (13.49g 0.058molAg 2 O dissolved in 50cm 3 water), stir quickly. The reaction vessel was wrapped with aluminum foil to prevent light fall. Stir for another 1 h until Ag 2 O reacted completely to give a colorless solution. Add 22.24g 0.116mol of 1-ethyl-3-methylimidazolium inner salt obtained in Example 1, stir at room temperature for 2h, filter and separate. At 70°C, vacuum-dried, the product was a white liquid. The reaction equation is:

[0047]

Embodiment 3

[0049] Preparation of 1-butyl-3-methylimidazolium bromide

[0050] Under stirring at room temperature, slowly drop 6.46ml of n-bromobutane (0.06mol) into 4.76ml of N-methylimidazole. After 24h, wash with ethyl acetate three times. Filter and dry in vacuo. The reaction equation is:

[0051]

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PUM

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Abstract

The invention relates to an ampere humidity sensor and a relative check method, based on room temperature ion liquid, which comprises a humidity sensitive element with room temperature ion liquid andelectrochemical probe, a signal amplifier circuit, a check circuit, a reference circuit, a gas system, and a display control system, to use the charge current of the humidity sensitive element and thereaction current of the electrochemical probe to detect the humidity. The invention is characterized in that using the room temperature ion liquid as the sensitive part of humidity, using the changeof reversal electrochemical property of oxidization reduction couple to detect the humidity of current type. The invention can overcome the defects of prior humidity sensor as bad exchangeable property, high cost, complex device, bad interference resistance, and small response signal linear range, caused by using alternative-current signal, to obtain the advantages as simple structure, low cost, stable property and high sensitivity.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to an ampere-type humidity sensing device and an application method thereof. Background technique [0002] Humidity sensing device can be divided into capacitive humidity sensing device (CN1220393A), resistance type humidity sensing device (CN1431489A), weight resonance type humidity sensing device and optical fiber type humidity sensing device (CN1036635A) according to the difference of detected signals. )Wait. Among them, the measurement of electrical signals has attracted special attention because of its simple working method and high response sensitivity. However, common resistive or capacitive humidity sensing devices need to use AC signals for measurement, so that the cost of the instrument is relatively high. The current-type sensing device has the advantages of simple equipment, strong anti-interference, and linear response signal. Moreover, the conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/403G01N27/26
Inventor 王荣朱国阳
Owner SHANGHAI NORMAL UNIVERSITY