PROBLEM TO BE SOLVED: To provide a breath diagnostic device capable of facilitating size reduction and saving of power consumption.SOLUTION: The breath diagnostic device includes: a semiconductor light-emitting element that radiates emitted light by energy relaxation between subbands of a plurality of quantum wells a wavelength control unit that includes a first adjustment mechanism shifting a wavelength of the emitted light into an absorption spectrum of one type of gas among the plurality of types of gas and a second adjustment mechanism shifting the wavelength of the emitted light within the absorption spectrum of the one type of gas a casing that includes a breath intake port, a breath exhaust port, an incident window of the emitted light, and an emission window of the emitted light a detection unit detecting an intensity of the emitted light and a signal processing unit calculating concentrations of the plurality of types of gas from a measurement value of the intensity of the emitted light released from the emission window.COPYRIGHT: (C)2015,JPO&INPIT【課題】小型化かつ低消費電力化が容易な呼気診断装置を提供する。【解決手段】呼気診断装置は、複数の量子井戸のサブバンド間におけるエネルギー緩和により発光光を放射する半導体発光素子と、前記発光光の波長を、前記複数種類のガスのうちの一種類のガスの吸収スペクトル内にシフトする第1調整機構、前記発光光の波長を、一種類のガスの吸収スペクトル内においてシフトする第2調整機構を有する波長制御部と、呼気吸い込み口と、呼気排出口と、前記発光光の入射窓と、前記発光光の出射窓と、を有する筐体と、前記発光光の強度を検出する検出部と、前記出射窓から放出された前記発光光の前記強度の測定値から、前記複数種類のガスの濃度を算出する信号処理部と、を有する。【選択図】図1
