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Analysis linearizing and automatic heat capacity compensating method for intelligent calorimeter

A technology of automatic compensation and heat capacity, applied in the direction of measuring heat, instruments, calorimeters, etc., can solve problems such as calorific measurement error, and achieve the effect of reducing temperature stability, improving measurement accuracy and saving costs.

Inactive Publication Date: 2005-03-23
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

The following three reasons lead to the current popular microcomputer calorimeters requiring re-calibration of the heat capacity when the difference between the temperature of the inner barrel when measuring the calorific value and the calibrated heat capacity exceeds 5K: First, because the specific heat capacity of the substance is related to temperature, so E It is also related to temperature; second, when there is a nonlinear error in the temperature measuring instrument, the difference between the temperature of the inner barrel when the heat capacity is calibrated and when the calorific value is measured will cause a calorific value measurement error; third, when the ambient temperature changes, the temperature measurement of the instrument Sensitivity and Zero Drift

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  • Analysis linearizing and automatic heat capacity compensating method for intelligent calorimeter
  • Analysis linearizing and automatic heat capacity compensating method for intelligent calorimeter
  • Analysis linearizing and automatic heat capacity compensating method for intelligent calorimeter

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Embodiment Construction

[0018] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0019] Such as figure 1 The method for the linearization of analytical method and the automatic compensation of heat capacity of a kind of calorimeter of the present invention is shown by resistance R t , R 1 and R 3 , R 4 Composition of the measuring bridge, consisting of resistor R 0 , R K , R L and R 3 , R 4 A calibration bridge is formed, the measurement bridge and the calibration bridge are connected to the amplifier A through the tap switch S, and output to the analog / digital converter ADC and then output to the microcomputer PC. Temperature sensor resistance R t The 4-wire connection method is used to reduce the influence of the temperature coefficient of the lead wire on the measurement results. One point of the tap changer S is connected to R K , R L Between, to calibrate the low end of the range, 2 points of the tap changer S are connecte...

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Abstract

An intelligent calorimeter for measuring the heat generated by substance is composed of measuring bridge, calibrating bridge, switching switch, amplifier, A / D converter and microcomputer. It features that the microcomputer is used for linear calculation of temp-measuring resistance value for temp compensation to heat capacity.

Description

technical field [0001] The invention relates to a method for measuring calorific value of a substance, in particular to a method for analytical linearization and heat capacity automatic compensation of a calorimeter. Background technique [0002] The oxygen bomb method is often used to measure the calorific value of coal, oil and other substances. It is to place an oxygen bomb (a high-pressure container) in the inner cylinder of the calorimeter. For the temperature rise Δt, the calorific value Q is calculated according to the following formula: Q = EΔt m , In the formula, the secondary factors irrelevant to this patent are omitted, E is the heat capacity of the calorimeter, and m is the quality of the sample. The heat capacity E of the calorimeter is calibrated by a substance with a standard calorific value, such as benzoic acid. The following three reasons lead to the current popular microcomputer...

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Application Information

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IPC IPC(8): G01K17/00G01N25/20
Inventor 成继勋徐光远
Owner HUNAN UNIV OF SCI & TECH
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