JPH02679U

JPH02679U -

Info

Publication number: JPH02679U
Application number: JP7932188U
Authority: JP
Priority date: 1988-06-15
Filing date: 1988-06-15
Publication date: 1990-01-05

Description

[Brief explanation of the drawing]

第１図は本考案の第一の実施例を示す縦断側面
図、第２図は第二の実施例を示す縦断側面図、第
３図は第一の従来例の正面図、第４図は要部の説
明図、第５図は第二の従来例の側面図である。１３……レーザダイオード、１４……窓構造部
、１５……光電変換素子、１６……被測定物、２
２……セルフミキシングドツプラー測定器、２６
……周波数トラツカ、２７……ＦＭ復調器、２８
……ＦＦＴアナライザ、２９……オシログラフ、
３１……セルフミキシングドツプラー測定器、Ｌ
……レーザ光、Ｌｒ……レーザ反射光。 Fig. 1 is a vertical side view showing the first embodiment of the present invention, Fig. 2 is a longitudinal side view showing the second embodiment, Fig. 3 is a front view of the first conventional example, and Fig. 4 is a longitudinal side view showing the first embodiment of the present invention. FIG. 5 is a side view of the second conventional example. 13... Laser diode, 14... Window structure, 15... Photoelectric conversion element, 16... Measured object, 2
2...Self-mixing Doppler measuring device, 26
...Frequency tracker, 27...FM demodulator, 28
...FFT analyzer, 29 ...oscillograph,
31...Self-mixing Doppler measuring device, L
...Laser light, Lr...Laser reflected light.

Claims

[Scope of utility model registration request]

A laser diode that has a window structure on its rear end surface irradiates the object to be measured with laser light, and an optical beat is generated from the frequency difference between this laser light and the laser reflected light that is reflected from the object to be measured and returned to the laser diode. In a self-mixing Doppler measuring device, in which a photoelectric conversion element for detecting the laser beam is arranged on the optical axis of the laser beam emitted from the window structure, the photoelectric conversion element is sequentially passed through an amplifier, a frequency tracker, and an FM demodulator. A self-mixing Doppler measuring instrument characterized by connecting an oscilloscope and an FFT analyzer.