Modeling

This section includes super high-precision voltage mode pyroelectric detector simulation models based on the innovated theory of a pyroelectric detector in the time domain. These models contain three time constants instead of two which are well-known from the classic theory. The new theory continues to refer to the thermal time constant and the electric time constant, and also discloses a new one - the pyroelectric time constant. Up to date (mid 2025), this statement has been proved for more than 500 times using similar pyrodetectors obtained from different manufacturers. Every time the exact identification required the use of the third time constant, previously unknown. The complete mathematical modeling and the corresponding experimental reports can be found in the section of Publications.

Micro-Cap is the best freeware tool for simulating thermal and electric properties of thermal infrared detectors, particularly, pyroelectric detectors. You may download any available version of Micro-Cap from the WebArchive, or you may download the last version of Micro-Cap from the author's Google Drive space.

Micro-Cap 12 (full CD, 58MB), 

Micro-Cap 12 (executable only, 16MB)

Figure Modeling.01 displays the true equivalent electric circuit of a pyroelectric detector modeled in Micro-Cap 12 (source:

https://www.researchgate.net/publication/396737376_The_true_equivalent_circuit_of_a_pyroelectric_detector_in_voltage_mode_for_a_motion_sensor). The numerical data correspond to a pyroelectric detector of LHI958 one element covered.

If you want to refer to this equivalent circuit in your academic article, research paper or report legally without plagiarism, you may use this DOI: 10.13140/RG.2.2.26919.41121.

Fig. Modeling.01. The true equivalent electric circuit of a pyroelectric detector modeled in Micro-Cap 12 .

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A pyroelectric detector-based motion sensor circuit diagram originated by Murata, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.02. The motion detector model released in Micro-Cap 12 similar to one proposed by Murata but slightly different .

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A pyroelectric detector-based motion sensor circuit diagram originated by Kube, but slightly different, including digital part from Murata, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.03. The motion detector model released in Micro-Cap 12 similar to one proposed by Kube but slightly different, including digital part from Murata.

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An alternative  pyroelectric detector-based motion sensor circuit diagram originated by Kube, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.04. The motion detector model released in Micro-Cap 12 similar to one proposed by Kube but slightly different .

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A still alternative  pyroelectric detector-based motion sensor circuit diagram originated by Kube, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.05. The motion detector model released in Micro-Cap 12 similar to one proposed by Kube but slightly different .

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A pyroelectric detector-based motion sensor circuit diagram originated by Rohm Semiconductor as BD9251FV, but slightly different, including digital part from Murata, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.06. The motion detector model released in Micro-Cap 12 similar to one proposed by Rohm Semiconductor, but slightly different with digital part taken from Murata.

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A pyroelectric detector-based flame detector electronic circuit originated by InfraTec, GmbH, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.07. The flame detector model released in Micro-Cap 12 similar to one proposed by InfraTec, GmbH, but slightly different .

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An alternative  pyroelectric detector-based flame detector electronic circuit originated by InfraTec, GmbH, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.08. The flame detector model released in Micro-Cap 12 similar to one proposed by InfraTec, GmbH, but slightly different .

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A still alternative  pyroelectric detector-based flame detector electronic circuit originated by InfraTec, GmbH, but slightly different, modeled in Micro-Cap 12, is presented below (source).

A further alternative  pyroelectric detector-based flame detector electronic circuit originated by InfraTec, GmbH, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.10. The flame detector model released in Micro-Cap 12 similar to one proposed by InfraTec, GmbH, but slightly different .

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A  pyroelectric detector-based flame detector electronic circuit originated by DIAS Infrared, GmbH, but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.11. The flame detector model released in Micro-Cap 12 similar to one proposed by DIAS Infrared, GmbH, but slightly different .

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A pyroelectric detector-based motion sensor circuit diagram originated by Eltec Instruments, Inc., but slightly different, including digital part from Murata, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.12. The motion detector model released in Micro-Cap 12 similar to one proposed by Eltec Instrument, Inc., but slightly different with digital part taken from Murata.

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A  pyroelectric detector-based flame detector electronic circuit originated by Eltec Instruments, Inc., but slightly different, modeled in Micro-Cap 12, is presented below (source).

Fig. Modeling.13. The flame detector model released in Micro-Cap 12 similar to one proposed by Eltec Instruments, Inc., but slightly different .

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